Looking for this part as well as the flywheel.
Any ideas.
Thanks
David
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I’ve been looking, but I haven’t found a stator for the 30 amp alternator. It should be nearly trivial to fit a SMALLER alternator, say, 10 amp, there are lots of scooter PM alternators out there, you’ll need BOTH the stator and the matching PM magnet cup. The larger Harley-Davidson 30+ alternators are THICKER than the Sonex/Aerovee piece, and you’d have to space the accessory plate out from the engine, making the whole engine longer, and screwing up your cowling fit on an existing plane.
The Sonex stator is potted, something I’ve not seen on other PM alternators. I guess the idea is to keep the windings from accumulating dust and oil, which saps the insulation resistance and eventually burns out the windings.
The flywheel is ultra specific. I’ve been looking for the flywheel magnets needed for the stock primary ignition, with no luck. The ring gear is probably a bought-in piece from a car, snowmobile, outboard motor, who knows, but the aluminum flywheel plate itself and steel center piece are custom.
Grainger has a bunch of magnets that look similar. I have my original magnetron magnet stuck to the filing cabinet in the hangar and I’m going to measure it to see if I can find a match.
The Sonex stator is potted
They were potted for a long time. But AIUI they changed to an un-potted version for the last couple of years? Manuals still show the potted version but I think the web store was showing an unpotted unit recently.
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I have flywheels and associated parts available. I am the original supplier of these.
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Awesome, thanks for joining the forum!
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