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.


  • 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
    Clicking the "Thank You" is Always Appreciated.

    Thank you said by: Richard Howell, RotaxOwner Admin

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