> > > We are contemplating the use of a rotary engine in
     > > pusher configuration on a gyroplane.

     Kevin Richey wrote:
     >
     > Woody:
     >
     > Is this for the Twinstar gyro built by Don Farrington?
     >
     > Kevin

woody DE wrote:

Dear Kevin ;

Thank you for your reply.
I have bought the Twinstarr manufacturing rights, all tooling etc..
We have made an ultralight version of the Twinstarr, called the

Twinstarrlite, which meets the stringent European ultralight rules.

The machine is now a lot lighter and handles well. In order to make

other engine option availabe, we are loking intensively at a single rotor
Mazda

aplication, in the knowledge that the Norton rotary is too expensoive

and apparently had some shortcomings (at least the earlier version).

I hope somebody can help.

I heard years ago that Atkins rotary made a single rotorversion out of a

13B, but it produced only 90 HP . I think nowadays with the 20B , fuel
economy as

well as output may have been increased.

Sincerely,

Woody DE SAAR--

Unless Richard Sohn gets his two piece alum/cast iron end housing in

production a

one rotor will weigh with PSRU about 200 pounds. Unless you go to

peripheral ports

or a turbo charger 90 HP is about all you can expect out of a one rotor.

Paul Lamar

My single rotor parts/engine will be comming. When? Hard to say. The plans
are to have the RES12, made with 12A parts, ready for flight testing in my
airplane by the end of this year.
The present configuration has not shown any design related problems at max
temperature tests (210F). Power testing will begin when the intake
design/testing is complete.
Engine weight at FF configuration is now at 170lb, with Hirth redrive. This
weight is based on actual parts, which might come out a little lower in
production configuration.
Power estimates, based on  MAZDA data is 115hp at 7500RPM.
A RES13 is the logical next step using the same major components as on the
RES12.

Richard Sohn
N-2071U
unicorn@gdsys.net
www.gdsys.net/WWWmembers/unicorn/

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