REFLECTOR: Prop

[NMFlyer1 at aol.com]

Larry, 

You are quite right, but I have not yet started flying. So... I had to start 
somewhere. Since my situation is quite a bit different from a direct drive 
aircraft engine setup, Think I'll be just fine. 

My (self imposed) max RPM is 5000 at the engine, and that will only be used 
occasionally. 
That RPM gives the prop speed of 2940.  My whole requirement was to find out 
if I could use my takeoff RPM/Power without breaking the speed of sound. I 
think I have that requirement. 

My cruise RPM will be quite different, about 3400-3700 Engine RPM (my best 
guess at this point). That would give me a prop RPM of about 2000-2300 at the 
prop. Since I have a pitch range of 65-105, I can crank in a lot of bite, and 
use the huge amount of torque I have. 

I will use your numbers to double check things, and I appreciate the extra 
info! 
Always fun to see how close paper numbers get to reality. 

Onward.   Kurt 
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