TM 1-412, Technical Manual, Aircraft Propellers, Prepared under direction of the Chief of the Air Corps, War Department, Washington, October 21, 1940. With Changes No.1, August 20, 1941
http://ww2airfronts.org/aircraft/gen...tm1-412-0.html
Ok, ha un po' di anni, ma non e' cambiato molto
Ciao.