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Re: Attic ventilation from fans - to jet engines

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On May 16, 2006, at 11:07 AM, John Riley wrote:

My physics is almost perfect up to and including levers and pulleys, but anything dynamic is over my head.
The thing that's thrusted against is the inside of the engine. The products of combustion (mostly hot air) accelerate out of the engine nozzle. The reaction to the force which accelerates the combustion products backward pushes the engine (and the attached airplane) forward.

Misunderstanding what is 'pushed against' is why the scientific editor of the New York Times pronounced rocket powered space flight an impossibility back in the 30's when Robert Goddard began his experiments.
Christopher Wright P.E. |"They couldn't hit an elephant at
chrisw(--nospam--at)   | this distance" (last words of Gen.
.......................................| John Sedgwick, Spotsylvania 1864)

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