I have some very basic questions. What is the output RPM? What is the
 weight of the engine and any required PSRU? I read RPM's from 8 to 9
 thousand and yet output of 2000. Is this with a PSRU? As you can tell,
 I am completely ignorant about rotaries. My first decesion is, can I, or
 do I want to, use a rotary to put in my KR? I am assuming the weights I
 am told will include all the necessary accessories including a PSRU if
 required. Any help will be appreciated.
 Thank you,

 Dave Coulson.

 Up to 11,000 RPM. But we uses only 7500 and a 2.85:1 PSRU.

 240 pounds for p-port 250 HP part cast iron engine.
 No cooling or exhaust. With 40 pounds PSRU.

 190 pounds for p-port 250 HP with aluminum end and center housings.
 With 40 pounds PSRU.

 Don't even think about side ports. No suitable intake manifolds
 available. http://www.rotaryeng.net/fund-of-intake.html

 Paul Lamar

But, but Paul why would he want 250 HP in a KR? and all that weight
hanging on the nose? Surely this is a case for a well engineered single
rotor with alloy end housings and a lighter PSRU.
Perhaps the Rotax/ Hirth PSRU with their dough nuts and the 270 degree of
power pulse of the rotary would live long enough to get to old age.
Does anyone out there really know?
John Evans


Your right. I missed the KR part. Mazda aluminum one rotor for now is best.
Close to 150 pounds with Tracy's PSRU less cooling and exhaust.
An O-200 is 200 pounds. KR's use O-200's right?

A one rotor is like a one cylinder two cycle engine. The Hirth donut is used with a 2 cylinder 2 cycle minimum therefore it is too stiff for a 1.3 L one rotor. Be prepared for a high idle speed. I am not sure the Hirth would
be up to the giant torque pulse. Richard Sohn is using one so
I hope he chimes in.

Freeze it with dry ice and drill some holes in it.

One could try that with Tracy's torque damper as well.

Just bug AIXRO to get their smooth 100 HP 2 rotor on the market.



Paul Lamar