On 11/1/05, Jim Sower <canarder@frontiernet.net> wrote:
<... I need a little more pitch if I am truly going to be ...>
Don't take a chance on getting over-pitched. You can always turn the
engine/prop faster. Makes for more power too. Max prop rpm is >3000 so
you've lots of wiggle room there, but if you're over-pitched ...
Nothing much good can come of that ... Jim S.
David Leonard wrote:
I am turning my 68x74 wood prop at 3000 right now in cruise (if it is cool out) with some room left in the throttle, but usually not a lot of room left in the cooling department when going that fast. However, as I continue to improve on cooling I am finding that I am running up against 3000 rpm. I don't think I should be running it more than that on a regular basis.
If I can turn my 2-blade 74" prop at 3000k, will I pick up any speed from a 3-blade 74" prop turning at the same speed (through reduced slip)? If I make the prop shorter can I turn it faster? I have heard that 900fps prop tip speed is a good upper limit. Is this a good number to use? Should I be using that as my cruise tip speed, not max tip speed?