Bill wrote;
It strikes me that you should be able to get over 6K static (and take
off) RPM with the 2.17 drive.
My static is around 5400 rpm max and there is
still throttle left. I am still working on my cooling, so I can not run
the engine. But I don’t think I am developing enough power to try
to fly.
Actually, I think 5400-5500 rpm static
is about right for a cruise pitch prop; especially with an engine that is not
well run in. I had about 5400 when I first started flying; now get about
5500. That gives me 5800 or so on take off, and 6300-6400 WOT at cruise
altitude and close to 200 KTAS.
Having some throttle travel left at max
static is a function of TB size and induction characteristics. On mine
the last 25% of travel does little for static run-up; makes more difference at
altitude and higher rpm.
Al G (Velocity 20B)