Has anyone worked with the rotary and a ducted fan? I have done a bit

with RC models, with acceptable performance.

So with the Sachs rotary, adding oil cooling to the engine should

help with better temps and lubrication. Still limited with 5000 to

6000 rpms, I was thinking of direct drive ducted fan instead of a

PSRU and prop.


Anyone have any experience with this approach, or pro's and con's?

David MIkesell

Perry Mick. Fooled with it for about ten years. Finally gave up and

put a gear box on it and went 20 or 30 MPH faster on the same fuel burn.

Paul Lamar

What is the application and required speed range?

George Wright


George was instrumental in writing a book on ducted fans as I recall.

What was the title and where can someone buy it George?

Paul Lamar


I had originally planed on my 20B driving a direct drive DF at up to 6500 RPM

I didn’t like how my first wood blade fan turned out

While in the process of fabricating a fan out of aluminum

I ran across a GE T-58 turbine engine I’ve since modified to operate as a pure turbojet

I feel the DF concept is doable and the rotary is IMO easily the best IC engine suited for it

But you’ll want power to weight ratios similar to DF RC aircraft to get any real performance

Which is no small feat

Jay Jacobs


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