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nuckolls.bob(at)aeroelect
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 Posted: Sun Mar 09, 2014 8:38 am Post subject: Rotax 91X 26 amp Gen2 $137.50 per amp |
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At 09:19 AM 2/21/2014, you wrote:
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<rparigor(at)suffolk.lib.ny.us>
Hi Group
Those who have a Rotax 91X know things aren't cheap.
Here's a 26 amp Gen2 for $137.50 per amp:
http://sportair.aero/12-epapower/epapower/
Ron Parigoris
BTW if you are a real die hard you can put one on the 130 HP 915 for $57,250
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Ahhh . . . the joys of free-market exchange of value . . .
for the moment we still have many options to ponder
from a variety of sources.
The Rotax 912 manual . . .
http://tinyurl.com/pa4k5by
page 17-5 illustrates a 2nd alternator
option that appears to be a relatively stock
automotive alternator with more output and
probably MUCH less expensive.
Bob . . .
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rparigoris
Joined: 24 Nov 2009
Posts: 805
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| Posted: Sun Mar 09, 2014 10:49 pm Post subject: Re: Rotax 91X 26 amp Gen2 $137.50 per amp |
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Hi Bob
True Rotax alt. alternator can be run from the front of the motor when prop is in tractor mode, on the plane Europa I'm building it requires quite the modification to the cowl and making sure that you have adequate clearance for the slip ring contact for the constant speed Airmaster prop. The cowl is quite close fitting to the motor.
I'm not an absolute advocate to $137.50 per amp, but it is driven by the aft side of the motor.
A Europa enthusiast was offering a kit to drive an alternator from the aft side of the motor for considerably less than $137.50 per amp. Perhaps all is OK, but long term in service history I suspect is not available.
I personally ran scared and purchased a short B+C alternator with a regulator that features Applied Archaic Technology (LR3C-14).
Not ideal. Weight further forward. Not cheap. The regulator is probably not as efficient as a switcher. The alternator does not spin as fast as would be desirable. But quality hardware, probably very reliable, you can easily set the set point voltage. It kinda gives me a warm cozy feeling.
Set up was not $137.50 per amp, but not cheap.
I initially purchased a ND with an internal regulator that was machined to fit a Rotax 91X vacuum pad. Unlike the B+C, no attempt was made to deal with a seized alternator like B+C addressed. In addition the drive gear had a smaller width. I was in contact with a Europa owner with a 6 cylinder Jabaru engine, and he ate up several alternator driver gears with the modified ND alternator.
Ron Parigoris
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