I think Chris B. brought this up earlier today. I didn't respond, but you mentioned it, so then couldn't resist the urge to comment. To refresh everyone's memory, I have a 20B with a 76" 3-blade constant-speed M/T prop. So, I can dial in the prop speed desired and the prop controller does the rest. With it set to 2500 rpm, I'm seeing 7000 engine rpm on takeoff rolls. (What a sweet sound! It makes those Lycosaurus' sound like farm tractors.) It will turn about 6700 - 6800 during static runups. But this is a c/s prop, so your mileage may vary.