Re: Thrust/HP

Date:         17 Aug 97 01:57:23 
From:         Andrew Goldfinger <Andy.Goldfinger@jhuapl.edu>
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In article <airliners.1997.1769@ohare.Chicago.COM> Mark Drela,
drela@mit.edu writes:
>  propulsive_power / fuel_heating_rate

Yes -- and here is a paradox.  Since propulsive_power is proportional to
velocity, and velocity is basically unlimited (i.e. I can define a
reference frame in which the aircraft is moving near the speed of light),
the efficiency can be greater than 100%!   It took me a long time to
figure out the solution to this paradox.  I will wait a bit before
posting it, so the readers can have the fun of figuring it out.