2.60m turning circle, does this sound right?

[robo555]

I just did my first CC-01 build. Everything stock except for ball bearings, locked rear diffs. I read the CC-01 has a large turning circle, but didn't expect it to take 2.60m to do a U-turn. Does this sound right or did I screwed something up? What's the best way to improve this?

Secondly, the front wheels seem to wobble, all the screws are tight, is this also normal?



Video of the turn:

http://youtu.be/Auu6tLhUVbc

[SuperNinjaRC]

I have the same turning circle with mine, and my front tires seem loose even when there aren't. They aren't built all that great, but for true scale looks they are.

[lonleycreeper]

Sounds about right, 10.5' with locked diff's. As you have noticed the steering sucks. There are several tricks on how to improve it in this section.

[robo555]

I've read several methods, what's the easiest and cheapest method to decrease the turning circle?

A CC-01 thread - Tamiya RC Forum @ URC Forums

On the post above post #1113, he said it improved a lot by grinding off a small tab and a big tab. Unfortunately the images don't exist anymore so I don't know what part he's referring to.

Is there more info on this method? It also mentions dog bones popping out if not done correctly, so I would like to make sure which part I need to modify.

I read about other fixes like upgrading steering kit and suspensions, but they seem costly and have problems of their own.

[aircooled]

If you'd just look at the movement of the knuckles in the C-Hubs, you'll see where the knuckles hit the C-Hubs to limit the steering. For example, on the C-Hubs, there is a small pin, just cut this off to have more movement.
I also added GPM knuckles, that provide bigger angles.

The more steering you'll have, the higher is the risk to the dog bones popping out. Either add a small silicon seal from a damper into the outdrives (small part of a spring from a pen will do as well) to reduce this issue or switch to CVDs.

[robo555]

Thanks, the C Hub is the part that needs modifying.

I've cut the tab that had the small tab attached, but not both tabs to prevent the dog bone falling out.

Retested, it's now 2.40m when turning left, and 2.20m when turning right. I think the servo just needs adjusting to use full range of motion on the left.

So, significant improvement with zero extra parts needed. If I decide to cut both tabs and switch to CVD it should improve even further. Interestingly, during assembly the instruction already tells me to put a silicon seal in the outdrives, and provides the necessary part for it.