It is not just the pinion
the ring gear also deflects and the lightening holes in it make
the deflection worse.

The shock loads should be mitigated by a rubber coupling

Something Everette did not understand

I was at his farm before he died

I have been up to Steve's house several times since


I was at sun n fun when the gear box failed

they loaded the airplane on a trailer and towed it home


P




On 03/17/2014 04:03 PM, William Jepson wrote:

Paul I believe you have pictures of the drive before they went to the support bearing inside the pinion. Without that support I would agree. After they had no trouble with it. Not trying to control 1000 HP.
Bill Jepson

On Mar 17, 2014 3:48 PM, "rotaryeng" <rotaryeng@earthlink.net <mailto:rotaryeng@earthlink.net>> wrote:

    PRIVATE


    New PS propaganda :)

    I have more info on that. The design was crap.

    I have a picture of the failed gears.

    The army rejected this Allison internal  spur design in 1931 :)

    Paul

    On 03/17/2014 11:22 PM, William Jepson wrote:


        I need to mention that Russ is incorrect about torsional
        vibration. The Powersport reduction was a "stiff" system that
        had no problem in any operating range on the 2 rotor. Raytec
        had a bunch of checking done and got a clean bill of health on
        2 rotor using everything from a constant speed to a
        lightweight wood prop. The 3 rotor has a very minor second
        order need for a dampener. The dampener can be fit into the
        bottom pulley. Actually planetary gearboxes have much bigger
        issues at low rpm.
        Bill Jepson

        Bill Jepson

        On Mar 17, 2014 9:51 AM, "rotaryeng" <rotaryeng@earthlink.net
        <mailto:rotaryeng@earthlink.net>
        <mailto:rotaryeng@earthlink.net
        <mailto:rotaryeng@earthlink.net>>> wrote:



            Hi Paul,

            Whatever happened to Powersport?

            Chris Cosman

            I have no real idea.

            Of course instead of selling parts and gear boxes  they
        tried to get
            rich quick charging $30,000  for firewall forward packages
        when
            one could buy an engine for $500 and over haul it for $3000 :)

            Paul Lamar


            It's my understanding the principle passed away.
            IIRC, the son then tried but some momentum was lost.

            Or, I could be wrong.

            Chris Barber

            Actually they never  solved a harmonic problem they had
        and one
            them died in an accident. Then they called it quits. Paul
        did you
            ever see the Ric Jet 4? It hsd a RX2 rotary in it and was
        featured
            in Sport Aviation in march 1975.

            Cheers Russ Ward


            I think you are talking about the Old Power Sport.
            Everett Hatch's accident had nothing to do with the engine.
            He split S into the ground. He may have had a heart attack.

            Paul Lamar


            Ok Paul, of the original Powersport in Oregon, Everett
        Hatch was
            killed in a crash. Steve Beckham, (co-founder), was
        distraught as
            he and Everett had worked together almost their whole
        lives. Steve
            sold Powersport to Raytec machine in Wisconsin. They had a
            saleable product but decided to completely redo it. They
        did minor
            mechanical changes but decided to do a complete FWF and engine
            management system. Not needed but there it is. They are not
            selling anything. There are other things going on but I don't
            think I can comment further.

            Bill Jepson


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