Just did a little test.
At 1000 meters, 30in. (30% power) would not allow my RPMs to go past 2100 (even at 100% p-pitch). I was practically stalling, and in a descent the whole time.
At 7500 meters, 25 in. (50% power) and full range of RPMs (up to 3000). I could go 200 mph indicated, and climb at 1000 ft/min. However, if I increased power to 30 in, it would suddenly jump to 50 in.
Lowering pressure to 40 in. would cause a jump to 25 in.
Very weird.
I figured the super-charger engaging would be the cause, but this occurs at altitudes other than the super-charger transition level.
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