RCU Forums - View Single Post - How to Correct Measured Thrust for Density Altitude?
Old 09-13-2012, 04:49 AM
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highhorse
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Default RE: How to Correct Measured Thrust for Density Altitude?

ORIGINAL: BaldEagel

Ask John Wright or Colin Stause both on RCU John used to do the testing for RCJI and Colin is the current tester.

Mike
Yup, agree. Any idea how to contact them?



Rctech2k7:

Got it (I think), thanks. To test my understanding:
Given that the std lapse rate of atmospheric pressure is 1"/1000ft and std seal level pressure is 29.92".......

If I measure 30lb T @ 5000ft density altitude, then the corrected thrust for std conditions would be.....(taking off my shoes and socks so that I can count on my toes as well).....

(29.92/24.92) * 30 = 36lbs

I wouldn't mind confirmation from some more folks with a background in this science (vs a background in guesses ;-) but the above formulation makes sense to me and doesn't give me too bad a headache.