Stone Tool wrote:

Are these rotors aluminum?

                                   H.W.

I guess they could be. Not likely however as Jon Lauter said they tried
that and the apex seal slots did not hold up as I recall.
Perhaps they now have a cast in steel seal slot reinforcer. 

Centrifugal force = m*v^2/r
r drops out.

M1 = mass of cast iron   M2 = mass of aluminum

V = tangential velocity

RPM1 = RPM of cast iron rotor engine

RPM2 = RPM of aluminum rotor engine.

K factor to convert Velocity to RPM.

M1*V1^2 = M2*V2^2

M1/M2=V2^2/V1^2

M2=.3*M1   RPM=K*V

M1/.3*M1 = (K*RPM2)^2/(K^RPM1^2)

K*RPM2 = (M1/(.3* M1 * (K*RPM1)^2))^.5

RPM2 = ((M1/(.3* M1 * (K*RPM1)^2))^.5)/K

Correct me if I am wrong.

Paul Lamar
 
The AirCraft Rotary Engine NewsLetter.              Powered by Linux.

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