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I have a weight and balance issue with an aircraft and I would like to place some weight on top of a Rotax 912s engine where there are two holes (see picture) plus the four holes used for a hydraulic governor (see picture) for a propeller, I believe other items can be bolted in this area.

Does anyone know what the maximum amount of weight that could be put in this area please?

Or does anyone know the weights of the items that can be bolted in this area?

 

Tom

8655_1_45974E46-50DA-4063-A032-B2AD49FE26BE.jpeg (You do not have access to download this file.)
  • Re: Weight and balance

    by » 3 years ago


    That's a pretty solid place I am sure you could add all you could fit.....

    However would it not be better to add less weight further forward ?

     

    How much do you need ?

     

     


  • Re: Weight and balance

    by » 3 years ago


    Most added weight I've seen was placed on the firewall and it could be lead.


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


  • Re: Weight and balance

    by » 3 years ago


    Thank you for your replies.

    The position I’ve mentioned is the most forward position left so l require some solid evidence of what sort of weight can go in that area.

    The weight required to be fitted there is 7 kilos, which is not a problem assuming it would be able to fitted in that position. 

    I’ve gone through all the Rotax manuals but there is no mention about weight limits so I’m now thinking it’s an email to Rotax themselves.

    Tom


  • Re: Weight and balance

    by » 3 years ago


    Why not mount 15 lbs (7 Kilos) of lead on the firewall? This is where I usually see it.


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


  • Re: Weight and balance

    by » 3 years ago


    Thank you for your reply.

    There are a number of reasons why extra weight cannot be used on the firewall.

    The firewall Arm is further back than the Arm position I wish to put the weight so that would require a further considerable increase in a 7 kilo weight that could be used behind the gearbox. 

    Any increase in weight on the firewall would have to be calculated to see if it could take such an increase in weight, and I’m fairly confident it couldn’t.

    All extra weight is eating away at useable payload.

    The ideal solution would be a crush plate on the gearbox flange which is the most forward position but due to the design of the new propeller a crush plate cannot be used.

    The most forward Arm useable position is behind the gearbox.

     

    Tom

     


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