Density Altitude Equation on HP 35s
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07-06-2014, 02:01 PM
Post: #1
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Density Altitude Equation on HP 35s
For fun I hammered out a density altitude app in Java and decided to change things up so it works on the HP 35s. I used the NOAA calculators and associated formulas from here: http://www.srh.noaa.gov/epz/?n=wxcalc
Here is the EQN formula for the HP 35s... D = 145442.16 * (1 - ((17.326 * B * ((288 - 0.0065 * (A / 3.2808)) / 288) ^ 5.2561 / ((9 / 5 * ((5 / 9 * (T - 32)) + 273.15 / (1 - 0.379 * ((6.11 * 10 ^ ((7.5 * (5 / 9 * (W - 32))) / (237 + (5 / 9 * (W - 32))))) / (33.8638816 * B))) - 273.15) + 32) + 459.69)) ^ 0.235)) D = Density Altitude B = Barometer(inHg) A = Station Altitude W = DewPoint(F) T = Temp(F) Example… Solve for D (Density Altitude)... B = 30.11 A = 5130 W = 39 T = 89 Result for D = 8040.64 In the formula I’m calculating Vapor Pressure, Virtual Temperature, and Station Pressure to get the Density Altitude. I seem to get a very slight variance on the 35s vs the NOAA online Density Alt calculator but still its very accurate. Cheers! |
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Messages In This Thread |
Density Altitude Equation on HP 35s - ptros - 07-06-2014 02:01 PM
RE: Density Altitude Equation on HP 35s - Eddie W. Shore - 07-09-2014, 07:36 PM
RE: Density Altitude Equation on HP 35s - Geoff Quickfall - 07-09-2014, 07:56 PM
RE: Density Altitude Equation on HP 35s - CosmicTruth - 07-10-2014, 12:28 AM
RE: Density Altitude Equation on HP 35s - r. pienne - 07-10-2014, 08:40 AM
RE: Density Altitude Equation on HP 35s - ptros - 07-13-2014, 01:56 PM
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