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I've just mounted my brand new 912iS engine to my Sling 2 project -- woohoo!!

The Sling Aircraft factory (TAF) supplies four M10 x 130 mm 8.8 bolts to pass through the standard Rotax ring mount, cup washers, distance spacers and rubber cushions and airframe engine mount. The M10 bolts are a very loose fit through the Rotax ring mount and my aeronautical engineer, aircraft designer friend (winner of 2 Lindy Awards), who helped me today, was quite concerned.

Are the M10 bolts ok for the ring mount? That's what's specified in the Sling 2 factory maintenance manual. There are several hundred Slings flying and more than a few for almost a decade with thousands of hours - some over 6000.

I don't want to second guess the design, just kind of looking for a touch of reinforcement.

Thanks.

  • Re: 912iS Engine Mount Bolt Size

    by » 6 weeks ago


    I have a Different Plane But the same Engine Mount.
    It uses 10mm Bolts also. 
    Once the 10mm bolts are properly Torqued (25-30 lb∙ft),  All the play will disappear.
    You are just seeing the allowance for the tolerance in the weldment.

    All is well.


    Bill Hertzel
    Rotax 912is
    North Ridgeville, OH, USA
    Bill.Hertzel@Yahoo.com
    Clicking the "Thank You" is Always Appreciated.


    Thank you said by: Richard Howell, RotaxOwner Admin

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