Can I fix a Jeti brushless?

[MtnGoat]

Was out flying my new Jeti 15/4 for the first time (finally saved up enough for a brushless setup). Apparently the engine mount was sufficient for a speed 600 but not a brushless.

While in flight, the engine mount disintegrated and the entire motor broke lose, whacked the fuselage, and then fell off the plane about 100 feet to the ground. :mad: :mad:

The shaft still turns by hand, and it doesn't seem bent, but it has a curious drag to it now it didn't have before (not the normal "cogging" action).

Can I open the can? What might be wrong? Any suggestions would be very welcome, as it will be some time before I can come up with another $90. Crap!

[target]

MTn Goat-
I have replaced the bearings in a 15/4 that went swimming in the Pacific.
Try tapping the shaft on a block of wood on the ground. The back of the case should come off. It has a little ridge on the lip that slips inside the ID of the body.
To get the rear bearing out, I "hydraulic'd" it out the way you'd see a sharp mechanic get a pilot bearing out of a flywheel-
Pack the bearing with HEAVY grease, then use a snug-fitting shaft to push down through the inner bearing journal. The grease pushes the bearing out from the rear.
I can get you the brg # if that is the problem with your motor.

By the way, I fly that pitcheron plane every weekend. Flies good.

Goodluck,
Target

[David Hogue]

You might have thrown a magnet...it will rub the stators if so, causing the rough feel. If thats the case...you can jb weld the magnet back in place, then wrap the rotor with kevlar thread and thin epoxy...do a search here on the words jeti and kevlar, the previous threads should some up with that. I have a bunch of flights on one since wrapping mine, and its still going strong.

Later,
David

[BMatthews]

The tolerances in these fancy motors are pretty darn tight. You say it's not bent but the only way to be SURE is to set it up and measure it with a dial guage or other very sensitive measureing instrument to check for runout. Just spinning it and not seeing any wobble with the naked eye is far from good enough I'm afraid.

If you don't happen to have a dial guage and magnetic base, and not many folks do obviously, there's a couple of tricks you can do to check it with a simple vernier or dial vernier caliper. This would involve mounting the motor firmly to a solid base and using the calipers in conjuction with some fixed reference points like heavy screws driven into a thick plywood plate with the motor attached to the same plate. If you don't have anything sensitive enough to measure movements in the .001 range then you'll need to find someone that does.

So check those magnets but beyond that you're going to need someone with some fancy measurement gear.

[Avro]

You can bring or send me the motor to Vancouver BC.
I can fix it most likely.
John