Tracy Crook wrote:

Ken Powell wrote:

I am one of those who would have fell into the trap that Tracy
describes.  However, it appears that an ideal ratio would be about 2.4/1
or 2.5/1.  I think that we are starting to hit the sonic wall (mach #)
at 6300 RPM for 68" fixed pitch props.

Ken Powell

Yes, a little higher ratio would be nice but OTOH, 6300 is as high as I want
to go for BSFC reasons.  BSFC starts to go up pretty rapidly above 6000.

Tracy Crook
rws@altavista.net
www.rotaryaviation.com

Indicative of a reduction in breathing capability and increased engine friction
of course.

Paul Lamar
 
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