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F3c with Airmaster prop

in 915iS Technical Questions 2 weeks ago

I am installing a 915 with an Airmaster AP340 electrically controlled prop.  I would like to install the Rotax external alternator, but the drive pulley for the alternator occupies the same space as the slip ring for the Airmaster.  I think I can machine the Rotax drive pulley to accommodate the Airmaster slip ring, but I don’t have drawings/dimensions for the pulley.

Anyone have familiarity with the F3c alternator drive pulley dimensions?  Better yet, anyone done the engineering required to make the F3c co-exist with an Airmaster prop slip ring assembly?

TIA,

Matt

10911_1_IMG_3924.png (You do not have access to download this file.)
10911_1_IMG_3925.png (You do not have access to download this file.)

  • Re: F3c with Airmaster prop

    by » 2 weeks ago

    We installed one on my Autogyro with a 914. I believe we got the spacer from Airmaster if I recall. 

     

     

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  • Re: F3c with Airmaster prop

    by » 2 weeks ago

    Jason Knight wrote:

    We installed one on my Autogyro with a 914. I believe we got the spacer from Airmaster if I recall. 

    I have a query into Airmaster as well, but haven’t heard back yet.  I can’t see in your photo where the brush assembly is mounted.  Is it on the side opposite the alternator?

    Thanks for posting the picture.

      
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  • Re: F3c with Airmaster prop

    by » one week ago

    Actually now that I remember we used the brush shaft that runs through the gearbox. Not sure if you can do that on the 914. 

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  • Re: F3c with Airmaster prop

    by » one week ago

    Jason Knight wrote:

    Actually now that I remember we used the brush shaft that runs through the gearbox. Not sure if you can do that on the 914. 

    I am not sure either.  Probably not easily as I didn’t get the engine that is hydraulic governor ready so would likely have to convert to the other type.

      
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