Reading between the lines about the propeller;

Torque turns the propeller?

And horsepower is just a way to tell how much gas will be burned?

Jim,

 

Say, let's not forget RPM.  After all,

 

HP = (RPM x Torque) / 5252

 

for a given engine, a fixed pitch prop produces its best thrust at some air speed and rpm. I am sure air density has an effect on efficiency, too.

 

I think I'll stick with a constant speed prop.  Nothing like a gear shift to help get the most out of my engine in those situations where I am not cruising at an optimal speed and altitude.

 

Gas just helps the pump move some air around......

 

Grayhawk