The x axis is J = V/nd where V is the forward velocity of the airplane and
n is the RPM of the prop while d is the diameter of the prop.

In our case d is always about the same so J is proportional to V/RPM.

Each curve is for a different pitch angle setting as marked.

So Vance, let me get this straight. These are bogus efficiency curves
for a variable pitch prop. Correct statement?

The curve on the right marked 45 degrees is not the efficiency curve
for a fixed pitch prop. Correct statement?

Paul Lamar
 
The Aircraft Rotary Engine Newsletter.              Powered by Linux.

http://home.earthlink.net/~rotaryeng/            http://www.linux.org