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Old 04-17-2013, 03:04 PM   #1
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Default Center shaft flex on TC

Has anyone had problems with the center shaft being too much out of balance? I usually run 2s and never did a mid air pull but did so after noticing the issue with a 3s, and it flexes at full throttle on 2s as well. The shaft bends around half a mm each way off center on 3s half throttle holding the car mid air (wasn't brave/dumb enough to try full throttle) and the car hasn't been abused, just normal racing on 2s and hasn't seen any rolls or wrecks just the normal bumping, trading paint, etc. I'm wondering if the flex subsides when the drivetrain is under load or if I should be worried about it blowing up or flying out if I try to run a 3s for kicks.
The car in question is an Ofna JL10e. I've already posted in the dedicated thread but I figure anyone with a shaft driven TC could help.
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Old 04-18-2013, 03:20 PM   #2
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Anyone?
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Umm, what does overkill mean again?
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Old 04-25-2013, 10:28 PM   #3
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hmmm
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Umm, what does overkill mean again?
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Old 04-25-2013, 10:41 PM   #4
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Pack the cups with o-rings, might help with some of the movement.
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Old 04-26-2013, 02:04 AM   #5
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Use ball bearings support for the middle of the shaft.
See Awesomatix A700 car solution.

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Old 04-26-2013, 09:20 AM   #6
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Most shaft cars do this (I've had a HPI Pro4 and Tamiya Evo V). When the shaft hits its resonant frequency it moves by a lot more than 1mm!

The awesomatix solution is the only real fix. Either that or a thick steel propshaft...
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Old 04-26-2013, 09:42 AM   #7
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Quick question you guys. When the Awesomatix A700 transforms to its robot form what does it look like and is it Autobot or one of them Decepticon?
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Old 04-27-2013, 01:18 AM   #8
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Now, who knew Batman would get some replies in here?
Quote:
Originally Posted by Oleg Babich View Post
Use ball bearings support for the middle of the shaft.
See Awesomatix A700 car solution.

Hey now this is an idea, thanks! I may just use some alloy servo mounts I have laying around along with some spare bearings on either side of the shaft. Going to have to drill holes on the chassis either way. As long as they use more than one hole to mount on the chassis it will keep them from swinging away from the shaft.

Quote:
Originally Posted by daleburr View Post
Most shaft cars do this (I've had a HPI Pro4 and Tamiya Evo V). When the shaft hits its resonant frequency it moves by a lot more than 1mm!

The awesomatix solution is the only real fix. Either that or a thick steel propshaft...
This was pretty much the answer I was looking for, thanks! I've only ever had belt driven tc's so this is a new discovery for me. Never had a problem with my shaft curvin...err...that don't sound quite right nvm

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Originally Posted by JustWill75 View Post
Quick question you guys. When the Awesomatix A700 transforms to its robot form what does it look like and is it Autobot or one of them Decepticon?
Maybe it'd be a new generation like awesomcon?
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Umm, what does overkill mean again?
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