Just for the sake of another data point I will add my two cents.
I have been flying with my Airmaster constant speed prop for close to nine
years.
Early in its life the prop spinner cracked, twice, and I TIG repaired it twice,
then Martin revised the spinner and there have been no further issues. I keep
up with the suggested maintenance. I see no advantave to the Woodcomp
alternative. The "extra" twist for enhancement of cowl port airflow is not a
factor in a 912s application.
As for performance quotations, I think they are pretty meaningless without
data on weight, density altitude, manifold pressure, RPM, etc.
In my aircraft, at a DA of 3000', GW of 1200#, and 70% power I see a reliable
118kts TAS with about 4.1 gph. In its current configuration, I don't have enough
data points to state a performance at 8000' which is possibly where best TAS
might be for the 912s.
Your mile will vary!
Cheers,
Ira
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Ira N224XS
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