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Old Jan 21, 2016, 12:37 PM
calguy is offline
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Whining noise very little lift

Hey everyone,

First time poster but long time follower here

I've had a Falcon-X heli shince 2012. Just replaced the battery after a long while (since 2012). I love this Heli as it's nimble and also has the ability to turn on/off lights during flight. After battery replacement it flew great, had a couple light crashes indoors nothing too great. Now everytime I try to lift from the floor and go full throttle it lifts and then I hear a whining noise and the heli comes down again...

I've read it could be the main shaft is bent. It doesn't look bent. Both A and B rotors move. There's a little resistance on the A motor.

Any advice on where to start for repair?

I know these IR coaxials are pretty inexpensive nowadays but I'd love to keep this one and fix it.

Best,

Calguy
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Old Jan 21, 2016, 03:42 PM
abenn is offline
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Letchworth, Great Britain (UK)
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Welcome to the forum

A whining noise and loss of lift could be a pinion slipping on the motor shaft or a main gear slipping on the main shaft. It could also be a motor coming to the end of its life.

The motors should have some resistance, but they should both feel about the same.
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Old Jan 21, 2016, 05:38 PM
calguy is offline
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Thank you for the quick reply!

I did notice that the B motor main gear spun freely (almost no resistance) by hand that is. The pinion gear also spun as I was moving the main grear though...

Any way to tighten them slightly so that there's some resistance like the A motor?


Both A and B propellers work just the high pitched whining noise at times...
Once again thanks for the help ahead of time!
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Old Jan 22, 2016, 03:33 AM
abenn is offline
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Sorry, personally I've never had a pinion come loose, and I don't have your particular model heli, so I can't be sure what the fix is. Have you checked if there's a little grub screw holding the pinion onto the shaft? If there isn't, it's either glued or is simply a tight push fit. Either way, a very small (to make sure it doesn't get into the motor bearing) drop of permanent Loctite might do the job for you. Or possibly a small drop of cyano onto the top of the pinion so that it wicks down to fix it to the shaft. Don't try to apply it directly -- put a drop on a piece of scrap paper, then dip the tip of a toothpick into the drop, then touch the tip of the toothpick onto the top of the pinion before the cyano sets.
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