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Does my 912 have "optional overload clutch"

in General Tech Discussion 12 years ago

  • Re: Does my 912 have "optional overload clutch"

    by » 12 years ago

    Hi Roger,
    In answer to your question Roger I am based in the UK but my aircraft is an RV12 with a Vans supplied engine which would have been shipped from the USA about June 2010.Regards
    Richard
      
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  • Re: Does my 912 have "optional overload clutch"

    by » 12 years ago

    Hi Richard,

    Roger, please correct me if I am wrong but to check for presence of an overload clutch you lock the crankshaft with the locking pin as instructed in the maintenance manual and try to turn the propeller by hand. It should move quite easily about 30 degrees if it has an overload clutch. If it does not move then you know it does not have the optional overload clutch intalled.

    Regards,
    Harri
      
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  • Re: Does my 912 have "optional overload clutch"

    by » 12 years ago

    Hi Roger,

    You wrote --
    "Do you live in the US? Is your engine newer than 2003? The 912ULS 100hp started coming with the slipper clutch as a standard in the US after 2003."

    So does that rule work in reverse too:
    My 912UL was purchased in the USA well befor 2003.
    Does that mean it does NOT have the slipper clutch?
    Or that it is unlikely to have the slipper clutch?

    Al
      
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  • Re: Does my 912 have "optional overload clutch"

    by » 12 years ago

    Hi Al,

    If you have a UL as you describe below then you don't have a slipper clutch unless you had one installed.

    Hi Harri,

    You are right about checking the friction torque with the crankcase locking pin and pulling it through the 30 degree arc with a gauge to get a reading. It is just nice to have some engine backround and that can usually answer an owners question up front.

    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell

      
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  • Re: Does my 912 have "optional overload clutch"

    by » 12 years ago

    Hi Roger,

    Thanks for your reply, Roger.

    You wrote
    "Hi Al,
    If you have a UL as you describe below [pre 2003 912UL] then you don't have a slipper clutch unless you had one installed."

    Other than the obvious disadvantage of not having the protection of the clutch in the event of a prop-strike, can you think of any other disadvantage or things one might want to do or consider differently than a Rotax owner who has the slipper clutch? Fewer/different restrictions on the oil?

    (Seems like one minor advantage, anyway, is we don't have to run the checks for slippage/torque.)

    Al
      
    Report
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