Hi Paul:

   I have been following the rotary engine discussion for a few months now.

   My particular interest is in 40 to 50 hp rotary engines as I am looking for the most light weight and efficient engine for an ultralight airplane.

   I came across the Advanced Innovative Engineering rotary engines a few days ago and they look pretty good.

   I am sending this email as a query - do you know anything about the AIE rotary engines?

   In advance, thank you,

   John Douglass

   Not much. I have seen them and heard about them.

   Unfortunately small and efficient are conflicting right at the moment. Most small rotary engines use
   charge cooled rotors or pumped air rotor cooling. The BSFC is in the range of .5 to .6 pounds
   of fuel per HP per hour while the oil cooled rotor Mazda is in the range .45 to .5.

   Of course they are better than a 2 cycle which is in the range of .60 to .70.

   Paul Lamar

You may be wiser to build a Mazda  p-port single rotor engine with aluminum end housings. It may be a bit heavier and the power more than enough. The advantage there is the takeoff and climbout would be exceptional and you would then just need to pull the throttle(s) back for max speed requirements. For many aircraft engines $10,000 does not go very far.
Dale Davies



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