I don't know about the rotors but Charley Airesman
had his direct drive Variez
soob powered at OSH. He used a long shaft extension
to get the small 54 inch
prop way out back of the airplane in real clean air.

He was claiming 230 MPH  from a 2.5 L single
overhead cam soob.
He also claimed four gallons an hour fuel burn at
200 MPH.

At a BSFC of and a weight of fuel at six pounds per
gallon:
BFSC    HP
0.38    63
0.40    60
0.42    57
0.44    55

Pick one of the above.

He was running it at 3650 RPM as I recall.

I think 70 to 80 HP direct drive with high boost
would be possible on a
one rotor at low rpm's around 3500 to 4000.

Paul Lamar

DENIS SMITH wrote:

Does anyone have the info on where this direct drive
prop comes from and what the rpm/power range it can
handle?

Charley made the very thin carbon fiber  prop himself but it was designed
by Don Bates for 3800 RPM and about 130 HP. Don's web site is on the 
ACRE NL website list of websites. 

Paul Lamar
 
The Aircraft Rotary Engine Newsletter.              Powered by Linux.

http://home.earthlink.net/~rotaryeng/            http://www.linux.org