Neu Heli motors (fan style)
 

I copied this from the Neu website. Basically its warning of weaker bearings in the H motors the way I read it. Are they smaller bearings to accommodate the fan or something. Anyway I would think that if the load a heli puts on the bearings is questionable, then I would for sure think the applications we are using these motors for would be a problem.

Anyone know anything about this?

http://www.neumotors.com/20061222/HeliMotors.html
(scroll to the bottom of the page)


Note for heli motors! Be sure that you check the motor bearings for noise every few flights. Excessive side loads on the front shaft can damage the bearings which can lead to bearing failure. Be sure to double check gear mesh and make sure it is not too tight! If there is noticeable play in the bearings they are making noise then it is time to have the motor checked! Damage of this type may not be covered as a warranty! Use your ears and avoid problems. This is most important for the 3D type fliers!

Some of the larger helis draw some incredible power and put a bunch of load on the motor. I seem to remember seeing 2500w from 500mm bladed helis, I could never afford the big .60-.90 glow conversions so dont know what HV guys push through those but I could easily see them drawing 5-6000w.

Helis typicaly run the motors at higher RPM as well, something I've had a hard time with coming from helis to surface brushless.

The 3D fliers portion makes me wonder if some frames dont flex with hard inputs changing the gear mesh slightly.

I would imagine surface vehicles would put the same type of loads on the bearings, slipper clutches probably help alot. But I dont think we are pushing the motors as hard yet as the heli guys.

Not sure why they would only have that warning for the H versions though. Unless it has to do with the fan pulling crud into the bearings??

I think that warning is for ALL their motors when used in helis, not just the fan model.