You could use the RB aluminum end housings to get a 110 pound 2 rotor
    long block. With 250 HP the thing will climb like a jet. Just watch the
    Vne. Only problem is the RB end housings are about 15K. What is the
    expense of building a one rotor that is still somewhat experimental even
    compared to the 2 rotor, and you do not have the vibration problem
    Richard described.

    Dale Davies

    Dale, the 750 is only rated for 140 hp by the designer. Also, a 250 hp
    engine would exclude the craft from the light sport category, a major
    reason for the popularity of the design, no medical required and
    easier to get the light sport ticket.
    The Zenith CH-801 would be the choice if light sport isn't a criteria.
    C. Smith



   There is no limit on engine power for an aircraft to be eligible as
   light sport. If you can make a two-rotor engine with cooling and
   propeller reduction unit under 200 pounds, I say go for it. The only
   power limit for light sport is that the completed aircraft can't exceed
   120 kt at full power at sea level. You can assure this with proper
   choice of carburetor or EFI.

   David Josephson



   A pitot tube sensing air speed and applying the pressure to a diaphragm to close a butterfly down stream of the carb or EFI would be able to limit speed to the 120 kt required. Takeoff would be a blast.

   Dale Davies