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Rotax additional alternator

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ploucandco

Joined: 16 Sep 2007
Posts: 69

Posted: Sun Feb 15, 2009 3:14 am Post subject: Rotax additional alternator

Hi all,



I am a little bit short of electrical power to run all the systems and landing lights in my 914 driven monowheel Europa XS.

Does someone has experience with the ROTAX extra alternator and does it fit under the XS cowling?



I also saw that some of you put the extra alternator at the end of the crankshaft. What's the added value in comparison to the ROTAX extra alternator except the CofG?



Thanks, Jacques

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h&jeuropa

Joined: 07 Nov 2006
Posts: 645

Posted: Sun Feb 15, 2009 5:22 am Post subject: Re: Rotax additional alternator

Jacques,



I have the alternator mounted on the rear of the crank shaft.  Advantages are CG location, uses space that is available and does not require change to cowl.  The Rotax alternator requires cowl changes.



These days with LED lighting and solid state radios, perhaps the Rotax standard (10-15 amp) alternator is sufficient.  I live in Northern US and have a heated pitot.  That is why I fitted the second, larger alternator.



If you need more information on the crankshaft mount, I have a install package and can supply the required parts.  There are a couple of Europas flying with this mod and a few other aircraft.



Jim Butcher

N241BW

XS  914

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kevann(at)gotsky.com
Guest

Posted: Sun Feb 15, 2009 11:36 am Post subject: Rotax additional alternator

Another option is to put an alternator on the vacume pump pad, rear of the 

gearbox. No cowling mod needed.

With the 914 electric fuel pumps, I feel better having two sources of 

electric power generation. Without two sources, when the Ducati regulator 

craps out, you are dependent on the battery alone to keep the fuel flowing 

to the engine. I don't think I would be comfortable continuing the flight on 

battery only, so a second source of power generation is my choice. Plus 

there is lots of power for strobes and stuff.



Speaking of the Ducati regulator I understand it is good to keep it cool. I 

mounted mine on the front of the passenger footwell inside the cold air 

intake plenum.

Anyone else mount the regulator down there?



Kevin, 19 hours and having fun...

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