ORIGINAL: JoeAirPort
Put a tach on it and see what throttle position gives you max static RPM. Usually it just max's out at approx 80% of WOT. I don't recall it actually lowering past that throttle position.
That's a good idea! The tachometer can resolve changes in RPM that the ear can't hear. I wonder how RPM varies as function of throttle position in the air. Real good argument for airborne telemetry.
CR