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Power settings
Thanks for another reason to get a G4T. Great picture. I had my tach and prop checked during my most recent annual. Actually it was part of calibrating the fuel system after that was overhauled. One were off by a little less than 50 RPM, which doesn't bother me too much as I am probably not that précise in my control manipulation. 200 RPM is quite a spread, however and I can see where you were having problems.
For what its worth, I have an O-2A and 65% power is about 23"/2300 RPM at 3,000 ft. That is also the power setting the USAF functional checklist says to use for post-maintenance test flight. Other altitudes and power settings are similar to what was posted by Ernie. The O-2 is pretty draggy and, to me anyway, the minor increase in speed at 75% is not worth the noise and fuel burn.
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