Pine Pienaar wrote:

Hi Perry

What design criteria did you use for this design. Hp, design speed, RPM,
hight ecs.

Thanks
Pine

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
http://www.mickaircraft.com/duckt.htm

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