Bob Noel wrote:

OK, I'm confused. Full throttle, 64%, is 12,500' for any engine?
How come my cherokee 140 couldn't even get to 12,500'?
What am I overlooking?


Because 64% of whatever HP you have isn't enough to get you there/
hold you there.

I've got 300HP in an airframe designed for 185. At 65% HP I'm
doing better than they can do with WOT at sea level.