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Koch Chart Formula
Sorry, I wasn't aware I was teaching freshman high school Algebra 1 here.
The "final product" is a series of four equations, two for fixed pitch and two for constant speed propellers. I will derive/illustrate the first one. It is left as an exercise for the student to complete the other three (hint -- you only have to change one number in the equation). D = Density Altitude (from the prior equation). TD = Takeoff Distance at D TS = Takeoff Distance at sea level % = The percentage increase figures from the prior document. For example, for a fixed pitch propeller: TD = TS * (1 + ((D / 1000) * 0.15)) Jim "abripl" wrote in message oups.com... Your function was for Da = f(Pa, T) which in turn require various approximations to get takeoff distance and climb performance - not a finished product. I may try again later to get a better empirical function - not impossible. RST Engineering wrote: did you not get the exact equations I posted here two days ago? Jim |
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