<< What makes airplanes fly, HP or torque? >>

Paul,
Suggest you substitute RPM for HP.  You will get some strange answers,
particularly if you haven't given them the opportunity to think HP.

Lynn,
It does not take HP to move a mass through a distance.  It takes zero HP and
you have done no work if you carry a 100 pound sack of potatoes the length of
a football field.  Carrying that bag up a flight of stairs is another story.
It does take HP to start a mass moving, to accelerate it, to raise it, to
stop it, or even turn it.  And It does take HP to overcome the drag that
airplanes continually develop while flying.

Looked like you had the rotating HP down pat, the straight line HP is easier
if you just go back to the definition of work and HP.  Drag (force),
distance, time, it's all there.

Nothing else to do at 4 in the morning.

Bob Darrah

 
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