Hey Paul,

I'm having an idea but I don't have a power curve on hand to do the
calculation with.

I'm wondering just how much boost it would take to get a two rotor up to
about 100 HP at sea level at about 2500 RPM.  I'm thinking, for someone
like me who is building an LSA compatible E-AB CH-650, that only needs
about 100 HP, that a direct drive rotary might be a better choice and a
simpler build than using a reduction drive.

All that would be required would be an extension bolted to the flywheel
end of the E-shaft that would carry the required thrust and
circumferential load bearings for the prop shaft.  No need for a rubber
coupling or problems dealing with chatter in the planetary gears.

I could use an unmodified RX-7 engine that's easily available from many
of my local junk yards.  I might even buy a well seasoned RX-7 to drive
around for a while until I'm ready to put the engine into the airplane.

Would you anticipate any cooling issues trying to dissipate 100 HP worth
of heat at 2500 RPM?  Would the water pump need to be over driven to
provide sufficient flow turbulence to carry the heat way?

I understand that runaway boost is a possibility with the TTC engine.
Could you build a rev limiter into your ignition or fuel injection
system to automatically cut back on the fire in the combustion chambers
if the rev gets too high?  You are using a turbocharger on that engine.
No fire, no boost.

Mark LaPierre

My guess is at least two atmospheres. 15 psi boost. Piece of cake as long
as you have Iannetti apex seals in there and an intercooler.

It won't run away but you could put a pop off valve on the
intake. They are only about $50 on ebay.

Kind of heavy for 100 HP. Unless you have alloy end and center housings.

Hang on gear boxes are on the way.

Paul Lamar

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