OK given the RPM limits for a given HP at a lower RPM the torque MUST BE
higher. It is mandatory. No two ways about it.  It is a law of physics and
not just a good idea. HP = T X RPM X K  You make RPM lower and torque
MUST go up to keep HP the same. Unfortunately airplanes fly
on HP,
HP to weight ratio and not torque alone.

Paul Lamar

Paul, I want to interject something here. The comments on
the Dodge engines. Or Cummins and Dodge engines. I own a Cummins powered Dodge and I can tell you the weight
difference between the Cummins and the new "HEMI" is VAST.
The Cummins weighs almost 1000lbs bare. This is more than twice the weight of the 5.7 liter hemi. If you were flying both of these engines, (assuming you could get the Cummins
off the ground,) The diesel would lose all of it's economy advantages in the fuel required to lift it's bulk. Diesels make good ground pounder engines. The added complexity and weight rarely makes for a good aircraft engine though.
Bill Jepson

 
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