REFLECTOR: Prop

[MMurp16900 at aol.com]

Subject Prop R.P.M.
The other consideration is prop diameter and tip speed.
If the tips go supersonic the prop will not be as efficient.
some racing planes have short diameter props for that reason.
Some aircraft have geared engines and the engine runs at a higher rpm and  
produces more power and the prop turns at munch lower rpm and higher pitch
Mack.
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