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Has anyone used an external alternator with the 915iS?  Anyone used an external alternator with an Airmaster propeller?  I plan to use an Airmaster propellor, but am trying to find a way to modify a drive pulley that will allow the Airmaster slip ring to also we installed along with the brush assembly which appears to use the same mounts as does the Rotax F3A alternator.

 

The documentation for both the Airmaster and the F3A lacks detailed dimensions to allow a determination as to what might be possible.  Airmaster does show how a Lycoming drive pulley can be machined to accept their slip ring, but I am not sure if the Rotax F3A drive pulley is large enough to be machined to accept the slip ring.

  • Re: External alternator

    by » 7 months ago


    I have an external alternator with an Airmaster propellor on my Edge Performance 912 STI.

    I have the small brush assembly mounted on the back of the gearbox. I have over a thousand hours with no problems. It’s possible that will be your option 

    Ed


  • Re: External alternator

    by » 7 months ago


    Why do you need another alternator ? There are already two and a battery backup which gives you triple redundancy ??  Going to quadruple seems a little excessive ?


  • Re: External alternator

    by » 7 months ago


    Ed Midgley wrote:

    I have an external alternator with an Airmaster propellor on my Edge Performance 912 STI.

    I have the small brush assembly mounted on the back of the gearbox. I have over a thousand hours with no problems. It’s possible that will be your option 

    Ed

    That is interesting.  I inquired of Airmaster about the small brush assembly and got crickets in response to several emails.  I then asked RANS since I bought the engine and prop through them.  They inquired and also had a hard time getting a response, but finally got a response that this wasn’t available for the 915.  No reason given as to why.  So, I ruled out that option.

     

    Do you know a direct contact at Airmaster that might respond to another inquiry?


  • Re: External alternator

    by » 7 months ago


    Glenn Martin wrote:

    Why do you need another alternator ? There are already two and a battery backup which gives you triple redundancy ??  Going to quadruple seems a little excessive ?

    You really only have one.  A is dedicated to running the engine so only B is available for ship power.  B puts out 28 amps at cruise.  I am building a fairly well equipped IFR airplane.  The heated pitot alone can draw 10 amps, at least initially.  Landing lights are 6 amps.  Strobes, nav and beacon are another 4-6.  It all adds up.  My steady state load at night in cold weather can easily exceed 20 amps and I would like a little more headroom.  And, for IFR flying, I like the redundancy. We have dual ECUs, dual spark plugs and dual injectors for a reason.  I similarly like dual alternators for ship’s power.


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