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That's a great idea- thanks Darson. And you are correct on the motors- they are 740kv. Thanks for the catch!

Thanks Darson- Much appreciated! Pains me to sell it but I need to scale back. No nibbles yet. Think I'm way off on price? Figured with all the gear and the fx-8 it was a decent start but maybe not?

Selling my fuly loaded QAV 550G complete with Spektrum transmitter, Fatshark goggles and full FPV kit. I built this quad very carefully over the course of several weeks, tuned it to Lumenier’s specs (for both gimbal and Naza) and it flies beautifully. Flown less than 20 packs with NO crashes...

UPDATE: Well after swapping motors and Naza output/ESC's, I found that the problem moved from motor to motor. Eventually found a bad solder joint under some shrinktube and resoldered a few suspect areas. Bench tests much better and I hoping the problem is solved. Test flight tomorrow will tell...

Doesn't seem to be any obvious difference in play, but I'll look more closely tonight. And yeah, at $60 a pop, I'm hoping this is electrical (read: easily fixed), but I fear you may be right. I will update my post after I swap motors and ESC's on that position. With two other motors...

Forgot to ask – is there an easy way to check the bearing? Even after it sputters, it still spins freely by hand when powered down. Doesn't seem to make any sounds until it's up to full speed.

Thanks for the response – much appreciated. I have not tried it with the prop off but I will definitely do that tonight. If you listen to the video above, you'll notice that around 20 seconds vibration becomes much more pronounced. This is true onto of my other motors as well, Although they do...

After two crashes resulting from sudden erratic behavior from my f550, I started poring through the forums looking for help. I thought maybe my Naza was at fault but after reading this very helpful thread...