> > > > Ben Baltrusaitis wrote:
     > > > >
     > > > > Here is an excellent example of the plane I am building with an IO-540
     > installed.
     > > > > (I hope mine turns out half as pretty!) Do you
     > > > > think a Renesis, the new VAM exhaust, and Tracy's PSRU will improve
     > > > > the air on the nose and the weight under the cowl to have
     > > > > better performance than the Lycoming with 300hp?
     > > > >
     > > > > BTW, it seems every day I am amazed beyond belief at the engineering
     > knowledge available here!
     > > > > Thanks!
     > > > > Ben

     > > > I think you will need a three rotor for something like that.
     > > > You might wind up with a bit less weight than the IO-540.

     >     My Starduster performs fine with a 180 hp Lyc. Since weight is a major
     > consideration
     > in homebuilt aerobatic airplanes wouldn't a turbo 2 rotor provide
     > performance without the
     > extra weight? There is plenty of space available under the cowling to route
     > the exhaust
     > away from the engine.
     >                           -  Gordon Haggard

     Aerobatic airplanes are real hard on turbos for oil drain back reasons.
     Plus you are on and off the power so engine response might be an issue.

     Nobody that I know of has used a rotary for sustained inverted flight
     so you would be on the bleeding edge there.

     Tracy's new gear box should be OK with a wood prop. Usually aerobatic
     airplanes use constant speed props for good vertical penetration.
     Unless you are willing to use an electric $10,000 Hoffman or MT you will
     have difficulty adapting a hydraulic constant speed prop.

     Paul Lamar

-> Ben Baltrusaitis wrote:

My thinking was to go with the Renesis for the same reason 
one opts for the 13B over a Lycoming-new technology. Tracy seems to
think 250hp is realistic from the Renesis. I'm figuring, with a 
sleeker cowl and less weight than the IO-540 performance should
be very good, especially for a 50 yr.-old dude who just wants to 
have a good time (no competition) and fly some cross country.
The Acroduster Too first flew with the 200hp IO-360.
And, yeah, Paul I do plan to go with the MT electric CS prop, 
in fact, the MTV-18 rated to 260hp looks like the choice.
Do you see any problems flying a rotary inverted?
Thanks!
Ben

With a 2.85 gear box and 7000 RPM max you are looking at about 215 HP.
Assuming you install a dry sump system the big questions is how the 
drain back oil out of the rotors oil will behave. It might drain
back better than a plugs up engine :) On the other hand the main bearing
oil drain backs point straight down and they may be more of a problem.

Paul Lamar
 
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