Jay Honeck wrote:
Doesn't this imply that redline RPM isn't related to engine limitations?

I believe it's both.

Why would (just for example) shortening the prop allow one to raise the RPM
limit of the engine?

It's bad to allow the prop tip to go supersonic. I believe that this is
because the shock wave reduces the efficiency of the prop. Others can
chime in on this. Shortening the prop "slows" the linear speed that the
prop tip is experiencing at a given RPM.




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