Props turn at a speed that keeps the tips below the compressibility range
therefore the prop speed is determined, at the top end, by the diameter of
the propeller.

Sometimes this is not true.  Listen to a Bonanza take off sometime.  That
noise is the prop tips approaching the speed of sound.

\Hank - San Mateo, Ca. LNC2 Rotary

 
The AirCraft Rotary Engine NewsLetter.              Powered by Linux.

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