Yeoch... Reedy motor's rotor shaft snapped after 3 runs...

[dale gribble]

I just finished putting this system in my Mini LST 2 about three days ago. I just got my new order of Lipos in today that included 2 3S (11.1v) 20-30C 1500mAh Turnigy lipos. After modifying the Mini Lst 2- raising esc/rx mount plate to fit battery, adding dual disk slipper w 60t spur from Mini-T and going down to a 17T pinion, I took it for a spin. All I can say is ridiculous. I couldn't get the truck up to full speed down the street before the truck would literally lift off the street and flip over, no matter how gently I tried to accelerate. I am not getting it past 70% throttle.

Before snap-

http://www.intergate.com/~rpurcell/rcu/fleet/mini_lst_brushless1.JPG

The rotor shaft snapped on the next run. I geared from a 17T to a 14T pinion to try and cool the motor down from ~140F where it was operating and went to attempt some more high speed passes. I also set the launches from soft to medium. After about 2 minutes, I hear the motor's RPMs start singing and the truck isn't moving. I found the pinion and shaft about 30 feet from the truck! The break wasn't really tied to an event; I was making repeated runs down the street.

I wonder if this is common? I will have to contact Reedy to find out.

After snap-


http://www.intergate.com/~rpurcell/rcu/fleet/mini_lst_brushless4.JPG

[Old_School_RC_1]

ouch... I seem to hear that quite a bit with brushless motors. First time i've heard of it from a 1/18 system though.

[dale gribble]

Ya, it's kind of a bummer... I am running the motor within Reedy's provided specs. I am pretty sure that they will make it right though. A lot of these companies' customer service is top notch.

[Cope57]

I wonder if it could be caused by improper gear mesh or maybe clutch adjustment?

[kufman]

Were you running it with open gears, ie. no gear cover? If so, a piece of junk may have gotten in there and wedged itself between the pinion and spur. This sudden deflection could break a motor shaft.