Vance is correct. As the airspeed increases, the effective (relative)
angle of attack of

the blades decreases and more of the air flow over blade reattaches and

the blade becomes more effective.

This should be appearant during high taxi tests. The RPMs will sag as the

prop becomes effective. If the static thrust is known for this prop/RPM,
there would be the same thrust at the same RPM now. The higher RPM may
produce less thrust now with a higher portion of the blade stalled. Once up
to speed everything gets way better. Lynn E. Hanover

Lynn E. Hanover

Well, whether "Stalled" or "Slipping", it sounds that my prop is
encountering those conditions that:

1.  The prop may not be producing any more (could be less) thrust at 5800
engine rpm than it did at 5100 engine rpm.

2.  That if the prop is spinning under that condition then I could expect to
see it "unstall"  on take-off roll or shortly after airborne.  Indication
being a temporary drop in engine rpm as the prop regains its "bite" and
loads the engine.

Appreciate all the inputs on my question.  Guess only one way to tell is to
fly it.  Thursday and Friday are looking good weather wise, so hope to
report on initial performance.

Any body know the e mail address of any Formula 1 air racers??

Ed Anderson

 
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