Katamarino
Pattern Altitude
Neither do I.. if you follow the path of rotation it seems that aggressive sweep on the leading edge would not be helpful for efficiency. If anything for a high speed application I'd imagine you want a as much of a flat fast surface as possible to hit the air perpendicularly, or, with a slight forward sweep and then taper as you see on the larger modern turbofans..
Nah, the faster you go the coarser the pitch you need. Just like my 182; the prop is flat pitched for slower flight like takeoff and landing, and coarser as you speed up.
With flat props the engines would just way overspeed before you got going fast.