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#1
January 13th 05, 11:53 PM
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Ah. I knew that. I'd have to use the pressure altitudes from the B
records. But these have to be adjusted .. the OAT must be recorded at the various altitudes and used to adjust the pressure altitudes to SL/standard atmosphere. Can anyone fill me in on how to do that? 
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#2
January 14th 05, 02:35 PM
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"But these have to be adjusted .. the OAT must be recorded at the
various altitudes and used to adjust the pressure altitudes to SL/standard atmosphere. Can anyone fill me in on how to do that?" Why? You're not concerned with absolute (True) altitude; just a delta between contiguous points. As long as you're flying through a sharp frontal boundary during your measurements, I can't see how this will matter. It's been a while since I actually did these manually, but Rho (density) cancels out in a ratio of Lift to Drag, no? L = 1/2RhoV2 CL S D = 1/2 Rho V2 CD S In any case, there are a number of places to get the gas law equations to convert to ISA. Google on ISA conversion formula or somesuch - I got several. P3 D=
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#3
January 14th 05, 02:40 PM
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Should have writtent "NOT flying through a sharp frontal boundary..."
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