Perry Mick wrote:

Paul, Bill Freeman and I have been hashing this

out. We're going with

about 80 inches in diameter, since that is still

ok at 2500 RPM, and the prop

can be shortened if required.  Blades are twisted

for a 75 inch pitch, which

is about 178 mph at 2500 RPM.  With CS it will go

faster than 178 mph

because the blades will pitch more at higher

speed.  Also some may run it at

2700 or 2800 with shortened blades.  We're sizing

the blade chord to absorb 250

HP or thereabouts.

A previous analysis I did seems to show the blades

only rotate

approximately +/- 5 to 10 degrees from the "0"

position from takeoff to cruise.

Vance, do you want to check our work based on

these design parameters?

Perry J. Mick
Mick Duckt N7XR

Vance Jaqua wrote:

Sounds like your approach is pretty sound - twisting
for 175 at 2500 aounds like a good compromise. I agree
that very few degrees of travel will cover a
suprizingly high range of operating points - Vanc

 
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