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Old June 7th 05, 08:33 PM
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Marc J. Zeitlin wrote:
Montblack wrote:

IIRC, LBS thrust = ("roughly" ...be gentle) 65% for its horsepower
equivilant.

100 lbs thrust will be about 65 hp. Is this close to being a workable
rule of thumb?


Nope.

Power = Force x Velocity

For a "thrust" engine, the equivalent "power" it's producing will be
dependent upon how fast it's going. At 60 MPH, 100 LB of thrust is
equivalent to about 16 HP. At 150 HP, 100 LB of thrust is about 40 HP,
so you can see that a rule such as you postulate isn't going to work.

--
Marc J. Zeitlin
http://marc.zeitlin.home.comcast.net/
http://www.cozybuilders.org/
Copyright (c) 2005


But generally thrust goes down as the engine accelerates. I believe
jet engines are rated at static thrust, only turbo props have a HP
rating.