109 prop pitch (rpm) and the supercharger

[JtD]

Originally Posted by bongodriver

Are you Crumpp in alias?

I find that very insulting. I'm not calling you names just because you don't want to "believe" a simple technical fact.

Originally Posted by bongodriver

I don't find aircraft manuals confusing thank you, I just find the idea of a prop turning at 1500 rpm being efficient less than believeable.

For your consideration: 1500 rpm with a 3.1m diameter prop is 240m/s prop tip speed. Combined with 430km/h cruise you're at 270m/s. If you now consider going supersonic (300ish m/s at altitude) is a bad thing, you might find the figure much more believable. Hope that helps, even if my charm is still lacking.