Geist,

I had a feeling that that is how you came up with that number. However, I understand that the pitch spec on a prop is a theroetical number expressing how far forward the prop would move if traveling through a solid. Since air can be compressed, and drag holds us back, the props on our airplanes become less than perfectly efficient. There has to be a correction factor that takes in to account the efficeincy of the prop shape, air pressure, humidity, air temperature, altitude, overall drag of the airplane etc.

Jet