Probably because of the internal engine friction, I was looking at the propeller only. What's the right windmilling RPM? I can tune, but need numbers. :)
The higher the airspeed, the higher the windmilling RPM. Using my very weak math and physics skills, a fixed 60-inch-pitch prop is going to want to spin about 1215 rpm at 60 kt, 1620 rpm at 80 kt, 2025 rpm at 100 kt, and about 2430 rpm at 120 kt, but obviously, in every case, it's going to be slowed down by the engine and accessories.
I don't know any general rule, but when I'm approaching at 70 kcas and 1500 rpm (which is about neutral thrust), then I cut the engine to idle on short final, my RPM drops to around 1100-1200 rpm (still at 70 kt) and the plane starts to sink like a rock. On the ground, standing still, my idle RPM is only around 500-600 rpm.
All the best,
David
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