Where the crane is lifting close to its rated capacity, wind speed is a critical factor as the safety margin is lower and wind can more easily impact on the crane’s stability. Click on any empty space in the window or on the "calculate" button. The instrument used to measure wind speed is called an anemometer, which is an indicator that will spin in the wind. A simple formula for average wind direction and speed can be found here. highest wind loads for any direction on the site (Exposure D now applicable to hurricane‐prone coastal areas) • Kzt = topographic factor defined in section 26. windspeed=(sensorvalue*0. Using the air temperature and wind speed, our calculator knows how to calculate wind chill precisely How to calculate wind chill? The current formula for the wind chill calculator in Celsius and kilometers per hour is as follows: T_wc = 13. Wind Chill Temperature = 35. 42 x 1000 = 250 Watts per square meter. This project calculates wind speed. Default is 12. Find mph, miles per hour, km/hour. Examples for basic wind speed of 90 mph from 15 to 45 degree are shown below. I use a calculator with a quick chart I got off this sight years ago to do the distance and wind speed to get me close to the target. If it is partially extended and flaps quickly, the wind speed is 25 to 31mph. For a wind speed of 3 m/sec (at 10 m level), a stack gas exit velocity of 20 m/sec and a stack diameter of 1 m, calculate the final plume rise for a momentum plume in a neutral atmosphere. Calculation. Here our wind speed converter quickly converts units like Knots (Kn), Meters per second (m/s), Kilometers per hour (km/h), Mile per hour (mph), Beaufort (Bft). How is it done. Also, by hooking up wind data from an epw file, you can use the resulting data to create a wind rose at any height. Wind Direction (°): wind direction at hub height. Wind speed can be calibrated by comparing with the original WMR968 value- more can be done later to refine the readings at low and high speeds, using a car speedometer to calibrate the anemometer. This list covers some of the largest onshore and offshore wind farms operating across the globe. Here is the simplified version of my equation: F = 4. Speed tells us how fast something or someone is travelling. The formula is to calculate stall speed is: V = √( 2 W g / ρ S Clmax ) V = Stall speed m/s ρ = air density KG/m^3 S = wing area m^2 Clmax = Coefficient of lift at stall W = weight KG The formula accounts for altitude by input of the appropriate air density figure. Image Gallery. Page Table of Contents. FORTIFIED Technical Bulletin FH-2020-01 provides […]. In short, the plane's velocity relative to the air, plus the air's velocity relative to the ground, gives the plane's velocity relative to the ground. The building which is used as a headquarter for police operation is 30 m x 15 m in plan as shown in the figure, and located right on the Gaza Beach. Wind & Time - Speed - Distance. Connect the wind gauge (via Bluetooth or plug-in - depending on the model). 16) This relationship takes into account the fact that wind speeds are measured "officially" at 10 meters (33 feet) above the ground, but the human is typically only 5 to 6 feet (2 meters) above the ground. In the previous two questions, calculate how long the passage will take. ” Clearly, both these things (10 rpm = 10 mph, and 10 rpm = 1 mph) can’t be true. You may find yourself asking how to calculate wind chill on a motorcycle because it feels so darn cold. Weight is in pounds. If we have wind speed data for 10m height, one can calculate (forecast) wind at higher altitude using power law formula; V (z)=Vr (Z/Zr)^2 where V (z) is speed of wind at required height Z, Vr is. Ta = Air Temperature (in degree Celsius). Wind Wave Height: s for varying wind speed (U) according to the following equations:. Annual CO2 of a 2 MW wind power plant with a capacity factor of 0. fort Wind Scale force number, wind speed range in miles per hour, a mid-point wind pressure value in pounds per square feet, wind force classification description, and potential tree impacts. feet per second. Wind Map - Basic wind speed map (Figure 6-1 of ASCE 7-05 Code) Program Assumptions and Limitations: 1. where: r = loaded tire radius, in inches N = revolutions per mile. See what the PageSpeed Insights tool shows, what The Wow-Score shows how engaging a blog post is. Hey,The attached is the output of the code. This cubic dependence does cut out at the rated wind speed. Set used for wind direction, specified as set number or set name (optional, if v. The following information has been adapted from the modern version of the Beaufort Scale, which ranks wind speed from 0 (calm) to 12 (hurricane force) based on its observable effects on water and land features. The first wind averaging technique applies to those measurements reported by all DACT, VEEP, and ARES payloads. Wind speed conversions are possible only in the context of a maximum (gust) wind speed of a given duration observed within some longer interval, relative to the true speed based on different durations of observation. V= 10 m s-1, omega = 7. abs(dp3)) # A in m/s A = np. The calculators on this page do velocity prediction. An instrument called an anemometer can measure wind speed. Rotor diameter : m Area of the rotor A= m² Wind speed v = m/s Air density ρ = kg/m3 kinetic power = watt (hypothesis of constant wind) kW. If the U eq /U hub distributions are different: combine the hub height speed distribution with the equivalent power curve. 205 kg/m3 'type. When we do this, I just want it to graph it. For FM Approvals (as with the American Society of Civil Engineers, or ASCE), geographic location plays a significant role in system level selection. Here is the formula for the wind speed (you can use this in Excel provided you use Named Ranges) WS =ROUND(SQRT(((SIN(RADIANS(MOD(TH, 360)))*TAS)-(SIN(RADIANS(MOD(TC, 360)))*GS))^2 +((COS(RADIANS(MOD(TH, 360)))*TAS)-(COS(RADIANS(MOD(TC, 360)))*GS))^2), 0) Breaking down the formula, we are using pythagoream theorem WS = square root([Horizontal Value Difference]^2 + [Vertical Value Difference]^2) and rouding the number to the nearest whole number Here is the formula for the wind direction. 2 MW × 365 days × 24 hours × 25% = 4,380 MWh = 4,380,000 kWh. Toxic Rain Calculator. In the second case, the plane encounters a headwind (from the front) of 20 mi/hr. Thus if the wind speed doubles (2 times as much speed), the power available goes up by 2x2x2 = 8 times. wind_speed = map(wind_volt,0. Formula to convert knots to m/s: # kts * 0. A cup anemometer is a common tool to measure wind speed. TWS = AWS - BS *. Calculate Basic Wind Speed, V b, based on mapped values (Figure 1 in Section 5) or the table supplied in Appendix A of IS 875. the basic wind speed is equal to or greater than 130 mph, or • In areas where the basic wind speed is equal to or greater than 140 mph • Other exemptions, testing requirements given in ASCE 7 -10, section 26. According to Gorlin, “People use forecasting and good judgment in everyday circumstances to deploy temporary structures—village placards, farmers’ market tents, shade structures, umbrellas—in wind speeds much lower than codes. Winter Storm Transitions from West to Midwest. How to calculate wind speed. speed, and the speed in the test section then should then be about 10. The overall efficiency is between 0. Also, high winds and elevated fire weather conditions are possible in parts of southern California. Most large turbines produce their maximum power at wind speeds around 15 meters per second (33 mph). A good scientific calculator should have a cosine function available if you don't know how to calculate it. Seismic waves, or tsunamis , have periods typically from 10 minutes to one hour, wave lengths of several hundreds of kilometers, and mid-ocean heights usually less than half a meter. In other words, the greater the wind speed, the smaller the spacing and vice versa. Average wind direction and speed are used for remote monitoring applications. Use this component to calculate wind speed at a specific height for a given terrain type. In addition to our wind speed converter, you can also convert precipitation values and distances (e. You can also convert true wind to apparent wind. Calculating distance in the wind – Headwind. The Wind speed maps are separated into risk category 1 through 4. The building which is used as a headquarter for police operation is 30 m x 15 m in plan as shown in the figure, and located right on the Gaza Beach. Most large turbines produce their maximum power at wind speeds around 15 meters per second (33 mph). The manufacturer should also adjust this calculation for the elevation of your site. In this tutorial, we are going to learn how to calculate Wind Chill Index in Python. I am using an S7-1200 to read in wind speed and direction values and create various alarms. If you double your wind speed you don’t double your power output, you increase it by a cubic factor! For instance, increasing wind speed from 4 mph to 8 mph is not double the power output, but increases it 8 times (8³/4³=512/64=8)! For another example, look at this dummy data below. When this happens, you draw another sketch of it. Multiply the number of rotations by the diameter in centimeters and divide by 265 to get the wind speed in kilometers per hour. 5); } //uses wind MPH value to calculate KPH float getWindKPH(float wMPH) { return (wMPH*1. If you can feel a breeze, it's 3-5 mph. I use Distance formula and re-ranged it to find speed (rate): Rate = Distance / Time. If rate r is the same as speed s, r = s = d/t. To solve for the speed of the current (c), first solve each equation for the speed of the boat in still water (v) in terms of c. 5/sqrt (pitch)* (4. Table 1609. maximum wind speed may need to be applied, for example where the load and boom have large surface areas. We recommend the use of Section 6. The surfaces of the PV arrays are between 5 and 10 feet. The faster you type, the faster you communicate with others. Weight is in pounds. 05103-L Wind Monitor: Wind speed and direction -50° to +50°C (assuming non-riming conditions) Wind Speed: 1. If the angular displacement or the angular velocity is not known, another formula is used for the calculation of the tangential speed. ASCE/SEI 7-05 used to have one nominal wind speed map, independent of the Building Occupancy Category (the term that was replaced by Building Risk Category in 2010). calculating wind speed from frequency value. b Section 6. 75 times the basic wind speed defined in ASCE 7. Wind direction The same kind of observation will give you an idea of the wind direction, too. The speed is equal to 4960 ft/s this time. u = u 1 * (z/z 1) p = 3 * (50/10) 0. Wind today, live map and prediction radar. This instrument is constantly measuring wind speed and those measurements are averaged over a two-minute period to calculate the wind. Solution: Wind Load Design wind speed, Vz = k1 k2 k3 k4 Vb From Table 1; IS: 875 (part 3) – 1987 k1 = 1. 35//for freq. A hurricane with wind speed 35 m/s is acting on a 10 m2 wall. Wall-Bracing-Length Calculator: Introduction Model building codes require all exterior walls of a non-engineered or conventionally constructed wood-framed structure to be braced against lateral loads from wind or earthquakes. The only thing that we then have to find is the tip-seed ratio. Question: How would you calculate the rotor downwash velocity (in mph), specifically for the Hughes 500? Answer: Following the advice of Mr. The equation 1 to 5, study from Grange on 2014 were used in this study to calculate the wind speed and direction from the MetOp satellite image [12] [13]. Get Wind Speed by Location based on ASCE 7-10, EN 1991, NBCC 2015 and AS 1170. How calculate wind speed with anemometer? Asked by Wiki User. Calculating the. I've played against people in the past that don't take no time at all to hit a very close/good shot. Velocity made good, or VMG, is a term used in sailing, especially in yacht racing, indicating the speed of a sailboat towards (or from) the direction of the wind. The first wind averaging technique applies to those measurements reported by all DACT, VEEP, and ARES payloads. For example, if the wind speed is 70 mph, the wind pressure is 0. Estimating wind speed is simple using a flag. The sensor array updates wind speed and direction once per second and then calculates the 16 sample average (wind speed) and the peak or maximum wind speed in the 16 second update period (wind gust) and passes this to the display console each transmission period. The authors set up a formalism for numerically calculating trajectories of spherical sports balls, including the effect of wind. Number of Spins Browse our library for downloadable, printable materials. At most sites, the wind speed is measured by an anemometer fixed to a tower at a standard height of 30 feet above the ground. See below: When using sin and cos on a calculator or computer, take care to convert from degrees to radians, if necessary. Connected to the end of the pipe is a large pump capable of moving 1,140,000 gallons of water every minute (152,000 cubic feet of water per minute). 0 safety factor. Calculate the value of wind rotor Efficiency (Cp) for the following Wind speeds: Upward wind speed=45m/sec, Downward wind speed=15 m/sec?. 51 = meters per second Formula to convert miles per hour to m/s: # mph * 0. Wind speed is normally measured by a cup anemometer consisting of three or four cups, conical or Sonic anemometer. Auto/manual power off. However, the object’s speed, v, is just s divided by t, so […]. where v is the equivalent wind speed at 10 metres above the surface and B is Beaufort scale number. Wind speed is measured with an anemometer, a device that gets its name from. Wind Energy, 4, 99 – 105. Let's compare it with 90 °F, the warm bath temperature. Electric switches measure the speed of the rotation, which is proportional to the wind speed. We already measured the RPM for one setting and can also measure our diameter. Wind Speed Calculator free download - Need for Speed Underground 2, DSL Speed, CD Speed, and many more programs. "Using the system, snow depth, weather and wind speed would also be measured to help glacier. To clarify, fixed-speed operation implies a maximum output power at one wind speed. H s /U 2 = 0. Thomas Booth from Vlapaiso, IN USA: Selden Bow Spritdoes more for Asymm Fun - July 17, 2015. 35 Calculate the amount of reduction. "Using the system, snow depth, weather and wind speed would also be measured to help glacier. 2 # scale factor sqrt(2) estimated by measurements # A in differential pressure A = np. Don't forget to compensate on wind direction. speed, and the speed in the test section then should then be about 10. Measuring wind speed is useful for many reasons. 5, and varies with both wind speed and rotational speed of the turbine. In short, the plane's velocity relative to the air, plus the air's velocity relative to the ground, gives the plane's velocity relative to the ground. WCA = WCA(max) x sine of the wind angle eg: Wind 330° at 20 kts Course 360° Wind Angle = 10° x 0. density of blade material. Wind Map - Basic wind speed map (Figure 6-1 of ASCE 7-05 Code) Program Assumptions and Limitations: 1. below this spreadsheet calculator includes : Damage with Wind Dancer - Wind Dancer is a Keystone which prevents any one shot on our build, when we have been hit Do note that this setup is for players who doesn't know how to properly filter out items with the trade site. For example, the first 3 wind speed bins in a wind distribution may be 0-1 m/s, 1-2 m/s and 2-3 m/s. Any wind speed values which fall within these ranges (bins) are grouped together and counted. Speed, in either Knots or Mph. For example, a “force 8" wind is called a “fresh gale” and has a velocity between 39 and 46 mile per hour, breaking twigs on some trees. Enter your wind speed measurement in any column at the appropriate height, e. Large easy-to-read LCD display with backlight. Other anemometers calculate wind speed in different ways. The dynamic force can be calculated as Fw = 1/2 ρ v2 A = 1/2 (1. 2256kg/m^3 So P = 1. Site wind speed Location Brighton Basic wind speed (Figure 6 BS6399:Pt 2) Vb = 22. For example, the first 3 wind speed bins in a wind distribution may be 0-1 m/s, 1-2 m/s and 2-3 m/s. For a 30mph wind the calculation would be 30 * 30 *. As an extreme example, suppose we had a constant wind from the north at 5 meters per second for 5 minutes followed by a constant wind of 5 meters per second from the south for 5 minutes. Download time calculator helps you to calculate the download time it takes to download a file based on your internet download speed/bandwidth. 2 kg/m3 ρ a = 1. To understand what your instruments are really telling you, it's important to first understand what the wind is doing and how it's affecting your boat. Based on the zip code location the calculator will select the appropriate wind speed and version of ASCE 7 required; however, those can be changed by the used if desired. For a "pure" function, it's possible that the verb is implicit: the word "compute" or "calculate". wind speed for projects, which is a very valuable piece of information – except that testing standards and specifications identify design pressures. bins: Wind speed bins as numeric vector or NULL if no classification is desired. average wind speed = 10 m/s (20 mph) Power = 0. wind_speed (type: int): wind speed in knots. Then click outside the field, click Submit, or use the tab key. Velocity is your velocity (mi/hr) as read on a speedometer. Calculate Basic Wind Speed, V b, based on mapped values (Figure 1 in Section 5) or the table supplied in Appendix A of IS 875. Based on gradient wind equations, including frictional force, and considering the effect of the movement of a tropical cyclone on wind speed, the Fujita Formula is improved and further simplified, and the numerical scheme for calculating the maximum wind speed radius and wind velocity distribution of a moving tropical cyclone is derived. Introduction Have you ever wondered how wind is made? Wind is caused by a difference in air To determine this, first calculate the circumference of the circle made by the rotating cups by measuring the distance around the circle that. α = (Wind speed heading° - Headwind Heading°) Headwind heading = Aircraft heading The angle shall be: -90° < α < +90°. VMG as % of true wind speed. distance = speed x time. Enter a temperature and wind speed that you would like calculated: What the temperature feels like to your body: Fahrenheit Celsius ° F: mph knots m/s k/h ° C : Watts per Meter Squared. Measure how far the flag extends in the wind. (30 pts) The Coriolis acceleration is given by 2 omega V sin latitude. Use the "reset" button to reset your calculation. Identifying Wind Damage to Your Roof If you’ve recently experienced winds of 45 mph or higher, then call us and we will get outside and take a look at your roof for some of the common signs of roof. Since I know that my fan blows 947 L/s on max. We calculate this from AWA and AWS, plus speed-through-water (STW, from a paddle-wheel or equivalent. Adjust again for actual wind value His formula’s First Step requires estimating the range and then using this figure as. Overall efficnecy, η= 15 % η = 15 %. In general, the fastest wind speeds are found in the eyewall on the right side of tropical cyclones. Calculating distance in the wind – Headwind. Converter, our temperature conversion charts, or calculate C to F or F to C yourself using the conversion Did you know that crickets can tell you how warm it is outside? Find out how to tell the like wind speed and humidity, will make a much larger difference in how hot or cold you actually feel. Of Instruments and Real Angles. Wind Chill is a mysterious and often misunderstood phenomenon. For example a 50 mph wind would impose a load of 2. Wind Load Calculator. Especially if it’s another RV or big rig, the wind generated from their vehicle is enough to blow you right off course. See the current wind in the world and windgusts. We at Wingardium-Energy use a logarithmic calculation to provide us with an estimation of what the average wind speed can be at a certain height. My new GX-15 top down furler makes light wind sailing truly enjoyable. Note that just taking a single 'snapshot' reading could be misleading, as one runner might be. Each time the paddle wheel rotates, it breaks a light beam and generates a pulse of current. The United States wind speed map provides information on basic wind speed in miles per hour in geographic zones. T=F*R we find. 6, you need to move a full ring. The "wind speed" reported in each observation is an average speed for the most recent two-minute period This two minute average is calculated from a series of 24 five-second average values. The answer will always be some fraction or decimal less than 1 (considerably less than 1), and greater than or equal to zero. Benefits, depending on how you use your anemometer, can include safety. The trees are assumed to fall if the wind speed generated by the tornado is greater than the critical wind speed of tree-fall, which creates distinctive tree-fall pattern. The average wind speed is the simple scalar average of the wind speed observations. Larger differences will occur with greater wind direction variance, which typically occurs at lower wind speeds (below about 2 meters per second). The air speed is the same for both trips and the wind speed is also the same. Unlike weight-and-balance or speed-time-distance calculations which are just simple arithmetic, the wind triangle requires trigonometry. I want to replace the headers & its data with new values that are calculated after applying formula for U&V conversion to windspeed & winddirection. Nabisco Dinah Shore. Wind Loads are important consideration in structural engineering in the design of a structure. METAR, TAF and NOTAMs for any airport in the World. ) This should give you a solid basis to calculate the actual wind speed. Wind speed increases slightly with height during the day, summer profiles being nearly flat. Solution: 1) Calculate wind speed at stack height. Just a quick question on reading the wind speed from pressure charts. Miles per hour can be abbreviated as mph, and are also sometimes abbreviated as mi/h or MPH. I've played against people think of it like a basketball player shooting free throws it is muscle memory and experience that is almost instantaneously guiding them on how to. We are going to use the math module function wherever we need them. fort Wind Scale force number, wind speed range in miles per hour, a mid-point wind pressure value in pounds per square feet, wind force classification description, and potential tree impacts. See what the PageSpeed Insights tool shows, what The Wow-Score shows how engaging a blog post is. Calculate the wind power for an area of 10 m2 at this height. Then click the calculate button, and the exponent value will appear in text box that. As shown in Figure 2 (for an 82 m diameter wind turbine), these curves feature three key wind speeds: Cut in wind speed: This is the wind speed at which the wind turbine will start generating power— typical cut-in wind speeds are 3 to 5 m/s. Your synoptic chart must have a geostrophic wind scale in order to complete this calculation. I got my Power on max. calculate the power at that wind speed using appropriate form of equation (5). I want to replace the headers & its data with new values that are calculated after applying formula for U&V conversion to windspeed & winddirection. Wind speed conversions are possible only in the context of a maximum (gust) wind speed of a given duration observed within some longer interval, relative to the true speed based on different durations of observation. Calculating Approach speed --additions. Conversely, 50 mph is 50 x 1. Increased speed enables merchant vessels to reach port sooner and maximize profit for its owner. Imagine you have a pipe 22' across and 500' long. This ANSI document specifies the design wind speed to be 0. The trees are assumed to fall if the wind speed generated by the tornado is greater than the critical wind speed of tree-fall, which creates distinctive tree-fall pattern. atan2, wind_component, wind_speed, wind_stats. 25 * 1225 = 3675N I would suggest that you let this force act at a height = half height of the box -. For the science experiment of 5th grade, the anemometer is prepared with disposable cups. A static wind pressure is applied to the structure by the program using the following general procedure. Wind speeds can vary considerably across a wind farm site if the terrain is complex (hilly) or there are changes To calculate the net energy production of a wind farm, the following loss factors are applied to the gross WAsP uses a potential flow model to predict how wind flows over the terrain at a site. 225 kg/m3 at sea level) A = Swept Area of Blades (m2) V = Velocity of the wind By doing this calculation, you can see the total energy potential in a given area of wind. analogReadResolution(12); double windSpeed = fmap(analogRead(A0), 496, 2482, 0. In my opinion, and several other opinions I have seen on line, summing all the wind speed data and dividing by the number of points is NOT an accurate way to calculate average wind speed. The ultimate end of this exercise is to determine ( approximately) how much of my total weight ( 85 kg) can be pulled up by the wind on the sail during a beach start or a waterstart. Estimate how fast you will go on your trip. In the case of the diagram below, the orientation of the wind barb indicates winds from the Northeast. The design calculation determines the allowable operating wind speed with respect of the load and its Sail Effect, using a formula which has been developed under the guidance of EN13000. Any change will alter how the algorithm calculates the command speed for the autothrottle. The direction of the arrow is the heading of the plane after correcting for wind, and the magnitude is the true air speed which is known based on performance calculations. (30 pts) The Coriolis acceleration is given by 2 omega V sin latitude. Representing the speed of 3-second intense wind gusts that structures must be designed to withstand. 2 m/s at 59 metres and 7. The orientation of the arrow represents the local wind direction and the length of the arrow serves as a qualitative measure of wind speed. 5 of BS EN 1991-1-4. They then use their formalism to study some interesting effects for both golf and cricket balls. where θ is the wind direction using "math" direction, and ws is the wind speed (ie, the magnitude of the wind vector). The world’s largest wind turbine generator has a rotor blade diameter of 126 metres and so the rotors sweep an area of PI x (diameter/2) 2 = 12470 m 2! As this is an offshore wind turbine, we know it is situated at sea-level and so we know the air density is 1. They will use a calculation based on the particular wind turbine power curve, the average annual wind speed at your site, the height of the tower that you plan to use. When the wind blows at 28 mph, the Bergey turbine produces about 1,200 Watts. TWS = AWS - BS *. If you don't feel like completing the math for the conversion of knots to miles per hour (mph) or kilometers per hour (kph), you can always use a free online wind speed calculator. The combined effect of the tailwind and the plane speed provide a resultant velocity of 120 mi/hr. Temperature display in Celsius Fahrenheit. Given the u and v wind components, we can calculate wind speed using the Pythagorean Theorem: Wind Speed = (u 2 + v 2 ) 1/2 To find the wind vector direction without quadrant ambiguity, check with the syntax of the scripting language you use (Python, Matlab, IDL, etc. mean_squared_error(y_true, y_pred, squared=False). Click on graph to print out larger paper that you can plot other points on. In my opinion, and several other opinions I have seen on line, summing all the wind speed data and dividing by the number of points is NOT an accurate way to calculate average wind speed. v = Wind Speed (in miles per hour). See example below. Horsepower & Aero Drag Calculator By David Nguyen Assumptions: Vehicle is a car driven on concrete with tire pressures 30 psi. number of blades. The design calculation determines the allowable operating wind speed with respect of the load and its Sail Effect, using a formula which has been developed under the guidance of EN13000. Wind speed zones in most of the continental United States are either 70 or 80 miles per hour, but you may need to increase this number based on your location. How to Use the Wind Energy Calculator. Wind speed is often measured with an anemometer in kilometers per hour (kmph), miles per hour (mph), knots, or meters per second (mps) (Figure 7n-2). We have the formula to calculate the WCI and it's straightforward. The exponent 1/ α and the depth of boundary layer Z g vary with terrain roughness and the averaging time used in calculating wind speed. You can calculate wind loads from wind speeds but to get an accurate answer you need much more information. I need to convert them to wind speed & wind direction. Now somewhere along the road we must have made either an error in How many revolutions would there be in one hour? I would imagine that your anemometer will give significantly low values. calculation of wind loads for low slope roofing. The cut-in speed is the lowest wind speed at which a wind turbine begins to produce usable power. Effortlessly compute speed or power for all important parameters, such as weight, grade, position and tire type. For a VS wind turbine generator (VSWT), it is possible to obtain optimum wind speed at different wind speeds. Below certain temperatures, staying out. where, p = the specified external pressure acting statically and in a direction normal to the surface, either as a pressure directed towards the surface or as a suction directed away from the surface, I w = importance factor for wind load, as provided in Table 4. I got my Power on max. This instrument is constantly measuring wind speed and those measurements are averaged over a two-minute period to calculate the wind. So for example it spins 65 times in 60 seconds you can calculate the wind speed in 6. Vult = ultimate design wind speeds determined from Figure 1609. The speed at which you talk has a huge influence on how the audience perceives you and your speech. Wind speed varies with height above the terrain (wind shear). Effect of wind speed and altitude on sprint times. A=(π/4) D 2. 6 or 80 kph. Some unscientific articles talk about wind power being 100% efficient. For example, the first 3 wind speed bins in a wind distribution may be 0-1 m/s, 1-2 m/s and 2-3 m/s. Then Click Calculate. Calculate wind energy at 10 mph vs 20 mph 10 x 10 x 10 = 1,000 20 x 20 x 20 = 8,000 Energy captured by the rotor is linear. Wind speed, V b,map (m/s) This parameter is used to calculate displacement height in accordance with A. Wall-Bracing-Length Calculator: Introduction Model building codes require all exterior walls of a non-engineered or conventionally constructed wood-framed structure to be braced against lateral loads from wind or earthquakes. For calculating the basic wind speed, the average value of 28 m/s is multiplied by a probability factor c prob, where: c prob =((1- K xln(-(ln(1- p ))))/(1- K x ln(-(ln(0. The total wind power flowing into the turbine is defined by the fairly simple wind power formula, shown to the right. Note that when the. A common formula for calculating the Wind Chill Index has been developed and widely used in the United States. Table 1609. Annual CO2 of a 2 MW wind power plant with a capacity factor of 0. The instrument used to measure wind speed is called an anemometer, which is an indicator that will spin in the wind. Wind-Roof Calculator on Internet Wind-RCI and Wind-VRA calculate roof cladding wind loads and vegetated roof assembly design parameters based on the National Building Code of Canada 2015 Try Wind-RCI. Launch the Doppler Ducks simulation below to visualize how wave speed is related to both wavelength and wave frequency. Effect of wind speed and altitude on sprint times. 5) (c) (wind speed squared), where c is a constant specific to the structure. 99 -LN(-LN(0. Tetsuya Theodore Fujita, a weather scientist, developed a scale known as the Fujita Tornado Intensity Scale to determine the damage based on wind speed (see table below). methods 1 Calculating Wind Chill Yourself 3 Measuring Wind Speed Wind chill is an invented concept that describes how wind increases heat loss on exposed skin. A wind speed histogram shows the number of hours or whatever time period is used the wind blew at each Annual Average: Wind Speed Histogram, Frequency and Calculation of Mean Wind Speed and Wind Power Potential at 50 tancredi. Simply use this equation to determine the radius to enter in the calculator: r = (10084) / N. So, if you want a 12’ x 18’ flag in Seattle, WA, it will need to be determined whether the flag pole you want to use can withstand an 85 mph wind x 1. Calculating average wind speed and direction. array(radar. In this video we go a bit further and work on converting our figures to get the actual m. So, for a head wind use negative sign "-". 0 safety factor. speed enable a warship to close with its opponent, or conversely, to escape from an attack. You might want some hysteresis from your IR sensor to avoid false triggering. A formula is obtained for calculation of wind speed in tornado, as proportional to the speed of convective updraft. A and C are angles. Enter a temperature, in either Fahrenheit or Celsius. EXAMPLE If the wind speed at 10 meters of height is 20 m/s, one can deduce the wind speed at 40 m if a = 0. Move the marker on the wind map and check the forecast for the selected place. Free wind calculator I made (this works best with level 81 Nike ball) Your tailwind formula is 100% on the money. Note: Use a basic wind speed of 100 Km/hr and ASCE 7-05 Procedure. The basic classification of anemometers depends on the measurement. slow the air as it collides into them. Every crane manufacturer will have their own defined limits and these limits will be related to the wind speed, the boom configuration, the load being lifted, the sail. If we have wind speed data for 10m height, one can calculate (forecast) wind at higher altitude using power law formula; V(z)=Vr(Z/Zr)^2. How fast you can click to check your click speed score? Click per second is nothing but calculating the frequency of your clicks. Purchase plans for turbine blades after your design is complete. Project name is optional as a reference for the user. 02 of being equalled or exceeded (50-year mean recurrence interval). Is there a simple calculation that can be used? Or is there a table that can be used I would like to know how much force is cause by a wind speed of 125mph on a flat surface. You can use both feather and stall pitch control methods in this configuration to limit power. The damage from a tornado is determined by the speed of its winds. Concept of Air Velocity can be used in air conditioning, heating and ventilating work. For example, if tonight’s forecast low is 36°F, and the forecast wind speed is 12 mph, the calculated wind chill would be around 28°F. Site wind speed Location Brighton Basic wind speed (Figure 6 BS6399:Pt 2) Vb = 22. The formula is wind chill index Twc = 13. ) height above level or gently sloping terrain with an open fetch of at least 150 meters. Low battery indication. where v is wind speed and B is Beaufort scale number. It would be good to know the force exerted for other speeds too. where θ is the wind direction using "math" direction, and ws is the wind speed (ie, the magnitude of the wind vector). 2 m/s at 59 metres and 7. Small terrain features, vegetation, buildings, and atmospheric effects may cause the wind speed to depart from the map estimates. Some types not only measure the wind speed and direction , but also display the humidity, temperature and air pressure on your smartphone. For a fixed rotational speed, there is a rated wind speed at which electrical power generated by the wind turbine is near its maximum ( P er ), and overall efficiency at this point is denoted C totR. But think about what happens if you stick your hand out of the window while driving down the freeway: The wind pushes pretty hard against you. For example, a “force 8" wind is called a “fresh gale” and has a velocity between 39 and 46 mile per hour, breaking twigs on some trees. In order for a structure to be sound and secure, the foundation, roof, and walls For Basic Wind Speed Map (Fig. If the wind is on one side of 360 and the runway is on the other, subtract the higher number from 360, and zero from the lower number. Alternately, the unit vector mean wind direction can be calculated by omitting the wind speed components. Using Labjack, I wanted to be able to calculate the voltage, RPM, and wind speed of this wind turbine we are building. Calculate the average wind speed, this will give you a generic idea of how much wind speed the site has. Any wind speed values which fall within these ranges (bins) are grouped together and counted. Initial speed probably is the most important, also exit size, because you can't speed the wind 10 times its original speed (not in an open area). ws = Wind speed (m/s) at an elevation of 10 meters Q = Net radiation absorbed per unit area of body surface (W/m2) E is computed like this where rh = Relative Humidity [%] While temperature and humidity are regional and seasonal factors, wind and radiation are microclimatic factors and are influenced by the local environment. sectors: Number of wind direction sectors as integer value greater 1. Light wind: 1-15MPH Moderate wind: 16-25 MPH Heavy wind: 26-38 MPH Gale winds: 39-54 MPH Storm winds: 55-73 MPH. Custom Wind Turbine Blade Plans Available from $4. Here is how to use our wind energy calculator in a step-by-step manner. Advances in Electrical and Computer Engineering ISBN: 978-1-61804-279-8 173. As you noticed in the above Arduino wiring diagram, there are two connections to the Arduino. Plan Elevation. The method of reporting filters the higher frequency peaks in wind speed which are less relevant to performance, which in many cases pilots use to support a decision to reduce or to discount gusts. The general basis for the wind chill is that the higher the wind speed and the lower the temperature the colder you will feel because the wind is wicking away the heat from the surface of your skin. Adjusting Wind for Sprints. abs(dp1) + np. For instance when you print a value that value is actually processed multiple times in the background inside the print function itself and getrefcount also counts the instance when the value is called with getrefcount method itself. This list covers some of the largest onshore and offshore wind farms operating across the globe. As per title, how to actually set DRAM Refresh Intervals (tREFI)? Is there any formula to calculate this? BTW owikh8464 Can I ask you how you like your EKWB components? I am going to build my first Loop as soon as Amazon manages to get their hands on my damn. 5/sqrt (pitch)* (4. If the wind is blowing at 6 meters per second, what is the tip speed ratio of this turbine?. Potential of wind power after blades - Betz limit. 5 (sine 30°) WCA = 5° Heading = 355°. 2 m/s at 59 metres and 7. 707, so the spin speed at Since speed is equal to the distance traveled over the time taken, Earth's speed is calculated by dividing 584 million miles (940 million km) by­­ 365. Taiwanese LPGA player Yani Tseng gets a wind blast at the 2012. In other words, Hz = (core1Hz+core2Hz+)/cores. Angular velocity (rotations/second) * Conversion from (rev/s) to (rad/s) * Anemometer radius (meters) = Linear velocity (meters/second) ___ 2 * π ___ *. I've got wind speed data given in vector form (u and v). Answer: The first step to solve this problem is to change the units of the speed and time so that the answer found will be in meters, since this is what the question asks for. High wind speeds yield more power because wind power is proportional to the cube of wind speed. meter But, on average, the wind velocity is only this high about 10% of the time. Ambient temperature around 25 degrees Celsius (77 F), no wind. mean_squared_error(y_true, y_pred, squared=False). It is possible to calculate the speed, distance or time if you have the other two values. Google use cookies for serving our ads and handling visitor statistics. distance = speed x time. sqrt(2 * rho * A) return A. 95 Free sample chord sections can be generated for 0. The density of air will always remain constant on Earth at 1. The exponent 1/ α and the depth of boundary layer Z g vary with terrain roughness and the averaging time used in calculating wind speed. The formula is wind chill index Twc = 13. When hiking in windy conditions, always carry extra water and extra clothing, hat and gloves. Print This Post. The speed at which you talk has a huge influence on how the audience perceives you and your speech. ## #Python's program to calculate the Wind Chill Index (WCI) #The wind chill index is only considered valid for temperatures less than or #equal to 10 degrees Celsius and wind speeds exceeding 4. Local airport or weather stations are also attractive locations to find local data but often provide wind data that are less reliable. At this speed, wind will cause widespread damage to trees, flip mobile homes and cause significant roof damage to commercial buildings and homes. Wind Speed (U) The algorithm for calculating the Coriolis force is: Coriolis Force Calculator. I'm trying to calculate the wind speed and direction from U and V and plot it in pcolormesh in python matplotlib. Wind is often described by two characteristics: wind speed and wind direction. I am using an S7-1200 to read in wind speed and direction values and create various alarms. This article describes mathematical model to calculate the performance of low power vertical axis wind turbine. Please note the time and assume that the wind comes at rest finally and also the radius of the fan. Subtract the smaller number from the larger number, unless crossing 360. The default reading is +5 knots. Wind power potential according to wind speed and area swept by the blades Potential of wind power before blades. It could be applied using the swept area of the wind tubine, but to get to the turbines actual output you need a few more things. Conversely, 50 mph is 50 x 1. Our calculator assumes the 0. How to calculate wind pressure from wind speed - The generic formula for wind load is F = A x P x Cd where F is the force or wind. Studies have shown that a head wind of approximately 10 mph can lessen a drive by 12 to 15 yards whereas the same speed tail wind would only add 5 to10 yards. Now, determine the trip length by substituting v=50 into the formula L = 6(550 - v) = 6*500 = 3000 miles. The extent to which the strong wind correlations hold for low. A and C are angles. maximum wind speed may need to be applied, for example where the load and boom have large surface areas. WIND SPEED (M/S) TIME. In addition, wind speed monitoring is a key element of meteorology. Recent improvements include the Putting Scale Green Speed Calculator which allows each player to quickly calculate different green speeds. The formula is wind chill index Twc = 13. If the chart does not have one, use this technique for Estimating Wind Speed From Isobars. Stick the center of the cross to the top of the pencil eraser with a pin or tack. Contribute to AndreyAD1/wind-speed-calculation development by creating an account on GitHub. Once you have done that, wait for a day in which the weather station reports the wind to be blowing continuously and at a particular speed (4 miles per hour, for example). Effect measurements indicate that wind speed variations in microburst regions at their highest Wind scissors can cause different effects on aircraft such as turbulence, increased or decreased speed How to mitigate the danger. The Trend Method is based on the notion that the wind-speed changes from hour to hour can be grouped in trends of various duration, either positive (increasing) or negative (decreasing). Velocity made good, or VMG, is a term used in sailing, especially in yacht racing, indicating the speed of a sailboat towards (or from) the direction of the wind. Muzzle velocity b. So, for a head wind use negative sign "-". 2 and EN 1991 (EC1). Aside from wind speed, the data set also contains 15 predictor variables which I include in. Calculator side of the Aero Products Research E6-B9 flight computer. Wind 50% speed[m/s] Time V600 V3 Dir 0 50 100 150 200 250 300 350 0 5 10 15 20 25 30 35 40 45 50 55 60 0:00 12:00 0:00 12:00 0:00 12:00 Direction [deg] Wind speed[m/s] Time V600 V3 Dir 155 km/h 115 km/h This is 75% of design wind speed and only ofdesignpressure Therefore No Damage!?! Yeppoon Rockhampton. calculate the power at that wind speed using appropriate form of equation (5). Wind speed can be calibrated by comparing with the original WMR968 value- more can be done later to refine the readings at low and high speeds, using a car speedometer to calibrate the anemometer. Show your work. Wind chill indication. 5 x Swept Area x Air Density x Velocity3 And the average wind speed is 11mph or around 5 m/s. Garage doors are vital when protecting your home during a high-wind storm. Click Properties and click the Symbology tab. Alternately, the unit vector mean wind direction can be calculated by omitting the wind speed components. The influence of this friction is less with height above the ground, thus the wind speed increases with height. 25/T) we can calculate the speed in miles per hour. The unit for wind pressure is pounds per square foot (psf). How to obtain the mean, median and mode of from a frequency table for grouped data and discrete data, How to get averages from grouped frequency How To Find The Mean, Mode And Median From A Frequency Table For Both Discrete And Grouped Data? Mean: multiply midpoints by frequencies. Calculating the wind speed is a simple experiment that can be done with a few materials. Table 1609. The mile per hour is a US customary and imperial unit of speed. slow the air as it collides into them. The equation for wave speed can be used to calculate the speed of a wave when both wavelength and wave frequency are known. An initial wind correction is only that, what the correction is at the start of firing. For SI: 1 mile per hour = 0. As per title, how to actually set DRAM Refresh Intervals (tREFI)? Is there any formula to calculate this? BTW owikh8464 Can I ask you how you like your EKWB components? I am going to build my first Loop as soon as Amazon manages to get their hands on my damn. 2(1)P and its value is provided in the National Annex. Stick the center of the cross to the top of the pencil eraser with a pin or tack. For example, a 30 degree 20mph head wind should be considered as 6mph or 7mph head wind ((30/90) * 20), or -6/-7 on Swingmate. Progress through the air is measured essentially by compass and instruments measuring air pressure (speed and altitude) and temperature (for air density measurement). Site wind speed Location Brighton Basic wind speed (Figure 6 BS6399:Pt 2) Vb = 22. 4527678% daily increase in network hash rate that has been the average daily increase over the past 6 months. For Vertical Axis Wind Turbine (Darrieus Rotor) the area can get as. I use Distance formula and re-ranged it to find speed (rate): Rate = Distance / Time. First, determine how many degrees off the runway heading the reported wind is. 3 Less than 3% of U. In cranes and other structures, this is known as the wind load. 02 of being equalled or exceeded (50-year mean recurrence interval).   Isobars that are close together indicate stronger winds. Our calculator assumes the 0. 37; K0 is a factor to convert 3 seconds peak gust speed into average speed of wind during 10 minutes period at a level of 10 meters above ground. To understand what your instruments are really telling you, it's important to first understand what the wind is doing and how it's affecting your boat. int is greater than the maximum wind speed. The wind speeds were worked out for 50 years return period based on the up-to-date wind data of 43 dines pressure tube (DPT) anemograph stations and study of other related works available on the subject. The true wind is said to be "Aft" of the apparent wind. Sometimes infographics can masquerade as how-to guides. You might want some hysteresis from your IR sensor to avoid false triggering. 5 mph of wind speed, if you were able to generate that much airflow in a static environment. Use the thumbwheel at the top to set the surface temperature gradient between the equator and polar regions. See full list on windynation. For example, to always ensure that wind speeds are displayed between 1-10, set ws. 8 x G/sinLat. Any wind speed values which fall within these ranges (bins) are grouped together and counted. Wind Loads are important consideration in structural engineering in the design of a structure. Here’s a wind force scale adapted to land. Knowing the wind speed can help you compensate for any wind and get more accurate shots. Click Advanced and choose Size from the drop-down list. V= 10 m s-1, omega = 7. That is, s upstream : v - c = 10. Temperature. It can calculate or measures the number of clicks divided by the seconds. A second reason for the wind speed increasing with height, especially near the ground, is due to surface friction. 2256kg/m^3 So P = 1. Whereas γ is the Power Law Exponent or Wind Gradient which is depending on the roughness of the terrain, the thermical lamination of the atmosphere, the wind speed itself and the height above ground. Based on this new trend, we recommend this: "Choose the largest fan with the highest wind speed that will fit into the space without overwhelming it visually". Given the u and v wind components, we can calculate wind speed using the Pythagorean Theorem: Wind Speed = (u 2 + v 2 ) 1/2 To find the wind vector direction without quadrant ambiguity, check with the syntax of the scripting language you use (Python, Matlab, IDL, etc. Both speed and velocity are kinematic quantities and. T a is the air temperature in degrees Celsius and V is the wind speed in kilometers per hour. The calculated wind power potential of Turkey is around 88000 MW, and a great majority of this potential is located in Aegean, South After examining the wind data in detail and performing the above-given calculations, according to the Weibull distribution in Figure 4, the average wind speed. Another key aspect is to account for the fetch of the wind as it travels over varying terrain and orography. 00 Probability factor Sp = 1. A guide to calculating wind speed and wind pressures for Australia and New Zealand with SkyCiv online wind Average Recurrence Interval - how often this wind speed is expected to occur. “The Wall of Wind facility at FIU can generate up to a Category 5 hurricane wind speed and is suitable for full-scale and large-scale destructive testing of roofing systems,” she explains. For power I use Power =0. The cyclone’s motion (forward speed) contributes to the counterclockwise wind speed. 2 includes Ps30 for basic wind speed from 85 to 170 mph and roof angle from 0 t 0 45 degree. In practice, these two wind shear formulae give similar numerical answers. 5/sqrt (pitch)* (4. Wind speed distributions have been modeled by Weibull method in three different wind conditions according to IEC 61400 standard, low, medium and Knowledge of extreme wind speed distributions is essential for design of buildings and structures. The basic wind speed in miles per hour, for the development of wind loads, shall be determined from Figure 1609. By combining the above formulas, we can calculate the energy of the air that passes through an area A in a time t : E=ρ×A×v3×t/2. As a general (really general) rule of thumb (unless you're going downwind), if you point about 15 degrees back from the apparent wind - that's about (double about) the direction of the true wind. The rotation of the propeller generates a speed and an apparent angle, which vary depending on the position of the observed point on the radius of the blade. Introduction The tiltrotor aircraft configuration has the potential. We note that X (just east of New Caledonia) is at about 22° south and that the nearby isobar lines are approximately straight and parallel. How do we measure wind chill? The wind chill is influenced by two factors, wind and temperature. Below is my code, which all works completely fine. That is, s upstream : v - c = 10. 6 million flights Air pressure on upper wing surface Air pressure on lower wing surface. The area swept by a wind turbine may assume as A (m 2) So for Horizontal Axis Wind Turbines (HAWT) which the diameter of the blades is D (m), the area is. } //Print frq and windspeed to serial Serial. Spinning cups turn a paddle wheel inside a metal canister under a digital anemometer. Every crane manufacturer will have their own defined limits and these limits will be related to the wind speed, the boom configuration, the load being lifted, the sail. Converts common speed measurement units to Beaufort numbers. The extent to which the strong wind correlations hold for low. Read World Wind Power Calculation. Adjusting for Wind. 5) (density of air) (wind speed squared). Understanding what a circumference of a circle is and how to calculate it is crucial as you move to higher level math. Here is the simplified version of my equation: F = 4. 707, so the spin speed at Since speed is equal to the distance traveled over the time taken, Earth's speed is calculated by dividing 584 million miles (940 million km) by­­ 365. Wind Speed: DP: Wind Speed: 10: 63: 30: 108 * Conversion is a basic mathematical calculation which does not consider environment and/or location. You trip distance D is in NM as normal. 1 meters, so the values has to be divided by 10 to get to a value in m/s. highest wind loads for any direction on the site (Exposure D now applicable to hurricane‐prone coastal areas) • Kzt = topographic factor defined in section 26. 0 is to be used. The cut-out speed is the wind speed at which the wind turbine stops being able to increase its power output, i. Wall-Bracing-Length Calculator: Introduction Model building codes require all exterior walls of a non-engineered or conventionally constructed wood-framed structure to be braced against lateral loads from wind or earthquakes. In the case of wind speed, vector-averaged speeds will never be larger than the scalar-averaged values and will generally be lower. Know the wind classifications so you can determine how much wind is too much for boating. Then it calculates how much power the wind turbine produces at that wind speed at standard air density. It's not linear so one needs to do the calculation. Rotor diameter : m Area of the rotor A= m² Wind speed v = m/s Air density ρ = kg/m3 kinetic power = watt (hypothesis of constant wind) kW. sqrt (u 2 + v 2) wind_dir_trig_to = atan2 ( u/wind_abs, v/wind_abs) wind_dir_trig_to_degrees = wind_dir_trig_to * 180/pi ## -111. U[3][24]) u Out[40]: array How do I fix this and find out how to calculate the wind speed and direction from U and V? Thank you. Calculator side of the Aero Products Research E6-B9 flight computer. For example, the first 3 wind speed bins in a wind distribution may be 0-1 m/s, 1-2 m/s and 2-3 m/s. Adjusting for Wind. where u-wind and v-wind are the horizontal components of the wind velocity, geopotential is the potential of Earth's gravity, and omega is the solution to the omega equation. This is actually an "engineering model" that knows the relationships between power, speed, and the three major forces: gravity, wind resistance and rolling resistance. See full list on windynation. Welcome to NASA's EOSDIS. estimating the site wind speed from available meteorological data. ASCE/ SEI 7 also details a calculation procedure for determining the required design pressure (also known as the wind load or DP) for a specific building opening application. Make an accurate range estimate and preliminary wind speed calculation as if it were a 10 MPH full-value wind 2. Speed (m/s) = SQRT ( u^2 + v^2) Direction = arctan (v / u) I get 264° @ 0. The "wind speed" reported in each observation is an average speed for the most recent two-minute period This two minute average is calculated from a series of 24 five-second average values. The trees are assumed to fall if the wind speed generated by the tornado is greater than the critical. It is possible to calculate the speed, distance or time if you have the other two values. When discussing siting of wind sensors it says, " The anemometer and wind vane shall be located at a 10 meter (33 ft. For example, a northerly wind blows from the north to the south. An example is: Wind Region Reg B, Importance level 1, Terrain Category 2, Design working life of 25years and maximum average height of 10m = Design Wind Speed 164km/h. For the example wind speed of 100 mph, do as Wind power increases exponentially compared to wind speed. Light wind: 1-15MPH Moderate wind: 16-25 MPH Heavy wind: 26-38 MPH Gale winds: 39-54 MPH Storm winds: 55-73 MPH. Tetsuya Theodore Fujita, a weather scientist, developed a scale known as the Fujita Tornado Intensity Scale to determine the damage based on wind speed (see table below). In physics, you can calculate power based on force and speed. A basic formula for calculating two different wind values is 2/3 for wind at your position, and 1/3 for wind at target. sqrt(2 * rho * A) return A. The rotation of the propeller generates a speed and an apparent angle, which vary depending on the position of the observed point on the radius of the blade. Every crane manufacturer will have their own defined limits and these limits will be related to the wind speed, the boom configuration, the load being lifted, the sail. How much energy is it possible to extract from the wind using a turbine? Basics. Hey,The attached is the output of the code. The manual method is rarely attempted due to time requirements and the quantity and weight of the equipment. In addition, wind speed monitoring is a key element of meteorology. In a time t, the mass of the air that will pass through this area is m=ρ×A×v×t, where ρ is the density of the air (approximately 1. To calculate the wind speed we apply a formula that converts the number of time the switch activates per period of time to miles per hour. How to Use the Wind Energy Calculator. 42 x 1000 = 250 Watts per square meter. 2256kg/m^3 So P = 1. dynamic decalage correction based on out of neutral trim. Wind Chill Calculator. Possibilities are shown of tornado wind speed forecasting taking into account criteria of tornado danger of the Cb clouds.