Originally Posted by shon7
Does the APU generate any kind of thrust that would move the airplane say if the brakes were not set?
Also, for Airlines where there are procedures where the APU has to be kept running the entire flight (in case of an MEL) -- would the APU contribute at all to the Airplanes thrust or is the thrust generated negligble.
The thrust geneated by a apu exhaust is negligible and would not contribute in any way the propulsion of the A/C.