SNIP...


     >>
     >> Here is some of my rational for choosing the gear box on the one
    rotor.
     >> John addressed some of it already.
     >> First of all is availability. How can you beat a proven product
    for that
     >> price? The same is true for the planetary gear boxes used on the 2
     >> Rotors,
     >> the planetary rear set is available at a price no one vould copy
    it for.
     >> Second is practicality. Even if there was a small planetary set
    available
     >> for the 100hp range, if optimized, it would be so small that
    every thing
     >> else would be driving the weight. The comlexity would not
    justify it.
     >> This only shows how much the experimenter is driven a lot by the
     >> availability of certain items, especially when the items get
    more and
     >> more
     >> complex.
     >> By the way, I am flying a ROTAX C box on my SOOB in the AVID. No
     >> problems.
     >> FWIW.
     >>
     >> Richard Sohn
     >> 8029 HWY 1087
     >> DeFuniak Springs, FL 32433
     >
     >
     > Richard, what HP are you putting through the C box? How many
    hours have
     > you run this setup?
     >
     > You're right, it's hard to beat a proven system at a good price.
     >
     > Keith Wood


    100hp is what the engine is rated at. I may be a little less with my own
    induction system.
    Time is 150hrs, with lots of TOL (400) using high power setting.
    Performance
    is very good.

    Richard Sohn
    N2071U


    Richard,

    Which Hirth box are you using on the one-rotor?

    As far as Rotax boxes go, I believe the A through C boxes are
    basically the same except for rmounting flange -- and the C box has
    a starter. But I think structurally they are the same.

    You can pick up a fairly good A box for maybe $200.

    The Rotax box seems to work well on 100 hp Subarus and Suzukis, but
    these are four-cylinder engines with more power pulses per rev. I
    would be more worried about a one-rotor, because of the single power
    pulse per engine shaft revolution -- like a 2-cylinder piston engine.

    I think belt is a good cheap solution for a one-rotor. If you are
    handly, you might even whip one up yourself...


    Regards,

    Gordon.

The HIRTH box I am using is a G40.
A belt drive can be whiped outfairly easy, however, with all the whipping I
am duing on the engine, there is no time left for anything else.

Richard Sohn
N2071U

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