Originally Posted by floodo1
can you explain how the wheel is made to accel and deccel throughout a single revolution?
The chatter comes from the fact that no R/C cars use true CVD's (Constant Velocity Drive). MIP and TiR CVD are actually just fancy rebuild-able UJ's (Universal Joints). The are no problems when the wheels are straight. However, as the wheels turn the UJ causes the axle to accelerate up to 7 deg ahead of the dog bone for 180 deg then decelerate 7 degrees behind the dog bone for the remaining 180. This 360deg cycle of acceleration and deceleration of the axle causes the chattering. Note that the car will not chatter with the wheels and tires off the car. The inertia of the rotating wheel resisting the axles acceleration and deceleration causes the chattering.
As the the drive system wears with use the chattering gradually gets better them pretty much disappears. The tiny amount of play that develops in a CVD with use allows the system to because less sensitive to and eventually can absorb the inherent oscillation.
This is why all the new guys have a problem with this but not the guys with older cars.
The chatter is only noticeable with spools. Diffs and one ways can absorb the oscillation.
All sedans chatter. The JRXS is the first car with a sort-of real CVD. It uses a very old articulating joint design to function as a CVD. It works and is very clever. Their ads say patent pending but I doubt they will be able to patent it as it has been around since the 1800's.
Others are working on real CVD's but the problem is that the materials available do not allow us to make true CVD's within the space and weight limitations required by our cars with acceptable durability....for now.
Some manufactures have figured out how to greatly reduce the chatter in their cars....and some have not
