You got me there Ed. Sounds like you need more pitch if your engine is strong
enough to turn that prop at 5800 RPM static. BTW I will bet your exhaust is less
restrictive than Tracy's so you have more power. I also think your intake
manifold is better. Your engine is also ported is it not Ed?
I hope you can run your airplane in the Sun 100 this year.

Paul Lamar

It is most likely that a portion of your prop was stalled at static in both cases,
and also that the increase in rpm is an indication of more power, but probably not
directly rpm squared since more of the prop was probably stalled in the second
case. It also sounds like your prop is too small in one dimension or another.
Vance

Vance mean blade width or diameter I think.

Paul Lamar

Yes, Primarily. Pitch certainly feeds into the static load picture, but should be
primarily based on attaiable speed, so it is not a good "knob" to turn when dealing with
static rpm. Diameter is almost always good, unless you are facing tip speed effects. Blade
width, and width distribution are good tools to work with for optimization to a particular
plane/prop/engine combination - Vance

 
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