The energy or, more practically, the power extracted from the fuel to keep the airplane flying level at a constant speed would give us some measure of the rate of kinetic energy decrease if the airplane maintained altitude after reducing thrust to nil.
Comparing the power delivered by the engine to the airplane at the reference speed with the power the airplane would have at another reference lower speed would give us the average kinetic energy loss between that speed range, for that weight. From that we could obtain deceleration rate. But i don't now how yet...
edit the rest of the post I have quarantined for analyisisssss
Last edited by Microburst2002; 27th Nov 2012 at 14:12.