Hi,, Paul:

My interrest is in a rotary engine replacement for the Garrett
TPE-331-10 (1,000 shp).  Reading your website, I see that Racing Beat in
Aneheim built and tested a 900 hp, 3 rotor turbo aircraft engine.  Do
you know if they are still developing this engine?  I wonder what a 4
rotor version would produce?

The engine would be installed in the (still under development) CompAir
CA11, single engine pressurized experimental aircraft.  Depending on
engine selection, cruise speeds will be anywhere from 260-360 ktas at
altitude.  The engine of choice for the CA11 is the TPE-331-14 with a
fuel burn of 71 gph (ouch).  Purchase of the engine is around $300k (0
time rebuilt) and overhaul is close to that price, as well.  TBO is at
least a respectible 5000 hrs.  A rotary engine would be less than all of
that, I'm sure, and I look forward to the day that hydrogen is available
as a fuel source.

Thanks in advance and looking forward to your newsletter.

Greg Fleming
London, Ontario, Canada


The 71 gallons an hour for the turbo prop would be roughly
at the 680 HP cruise level.

Sounds like a perfect application for a turbo four rotor.
Fuel burn at 680 HP level would be about 50 gallons an hour.

The engine can be built up from two rotor parts.
I would contact Jim Mederer at Racing Beat directly.

Jim Mederer <jimmederer@yahoo.com>

Jim has a lot of experience building rotary engines for aircraft.
Here is one example. He built his first couple of 12A turbo's in 1973.

Also contact Francois at Mistral. They may be interested in building a turbo
four rotor. François Badoux <f.badoux@mistral-engines.com>
They have a constant speed prop gear box that might be adapted to a four rotor.


Paul Lamar