Broke a motor shaft, while flying I 'm starting to think these motors aren 't the best in the...

[G+_Robert Watson]

Broke a motor shaft, while flying.  I'm starting to think these motors aren't the best in the world. /s

[G+_Eddie Foy]

What motor?  Happen on a hard accel?

[G+_Robert Watson]

It's the Turnigy motors that come with the Hobbyking Spec 250fpv kits. I think they are 1704-1900kv?

I was just hovering in my front yard. And I have only had one of what may be called a "semi-hard" crash.

[G+_Wayne Black]

One thing that I've learned over the years about the manufacturers in China, is their "quality control" is hit or miss. They are getting better, but when they do the heat treating process, sometimes the metal will come out too soft or, what looks like in this case, too hard and brittle.

I've seen drills made in China that when you went to drill a hole the drill would literally un-spiral.

It's worth contacting HobbyKing and see if they'll replace it.

[G+_Eddie Foy]

I'd hope it would get replaced under warranty. I try to have faith in vendors. (usually they are good)

I think with how fast things spread on the Internet, most understand 'bad press'.  back in the mail order days with no online forums (even FidoNET, didn't count) was  a different story/perspective.

[G+_Eddie Foy]

but you might want to buy a spare also, if you don't want down time.  (warranty shipments might not be fast)

[G+_UAV Pirate]

Sometimes it's better to have the cheap plastic prop. When the motor is spinning as fast as these do its a lot of stress on the shaft. A plastic prop may have broke saving the motor? If this was a prop strike?

[G+_Eddie Foy]

Flexible plastic props vs rigid carbon?  Tough choice.  If filming, probably want plastic (less vibration/Jello effect), racing/work carbon probably a bit better.

Also carbon won't absorb transient vibrations, so it has to go some where.  Next stop: motor.  Then frame.

 

Balance those props!!!! Especially if rigid/carbon take and fix the vibration reports from the flight controller.