Wow, that is 2935 RPM at the prop with a prop tip speed of just under 900 FPS.  I am still too shy to run mine that fast, although I could easily get there.  Interestingly, the calculations say the max corkscrew speed of that prop at that RPM is only 197mph.  He could pick up a little for being really clean, and maybe some more depending on how they calculate prop pitch.

The pitch is a measure of the angle of the chord of the blade; or sometimes the flat on the RAF airfoil; it doesn’t measure the “lift” of the airfoil.  So it seems to me quite possible to go faster than the “corkscrew” speed of the prop.  But then I could be wrong . . .

Al