Where ever I go and the subject of aircraft engines comes up I 
am always amazed at the mis-information out there. Next year
I am thinking of offering a forum at OSH on engine fundamentals.
The first thing I think I will do is pass out a quiz.

I have a100 HP aircraft engine rated at 2500 RPM.
What is the torque?

I have another 100 HP engine rated at 5000 RPM.
What is the torque? 

If I gear this engine down 2:1 so the prop rotates
at 2500 RPM what is the torque applied to the prop?

My airplane goes 150 MPH and the drag at this speed
is 100 pounds how much HP do I need?

How much torque do I need?

What makes airplanes fly, HP or torque?

Can anyone think of any other questions I can ask?

Paul Lamar
 
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