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Old 12-29-2012, 02:05 PM  
terry.sc
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Join Date: Aug 2008
Location: Stockport, UK
Posts: 982
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Quote:
Originally Posted by AreCee View Post
It also doesn't mention that you can adjust Akerman by moving the servo back or forward before fixing it in place.
The article is just copied directly from TamiyaUSAs site and both just discuss bump steer with no reference at all to ackermann. The front on photo showing the angle of the links has the servo saver mounted much lower than if it was actually on a servo which greatly exaggerates the angle of the links, and to remove bump steer with the servo saver on top you have to add spacers to move the links down to the same height they would be if the servo was mounted vertically. The piece reads more like someone who doesn't actually understand what is happening and taking a wild guess at it.

Vertical servo as in the instructions gives you less ackermann angle, horizontal low profile servo gives you more ackermann. The further forward the links are mounted in the centre the less ackermann you will have.

The vertical servo, so the servo horn is in front, keeps the links as forward as possible at all times, so you get the lowest ackermann angle possible and the outer wheel turns the most when the steering is on full lock. The smaller difference in angle between the two wheels gives you a more aggressive turn in to the corner and more steering at high speed, but can cause understeer exiting corners.

A low profile servo mounted horizontally so the servo output is on top will give you a greater ackermann angle when cornering. This will give less overall steering, but smoother and more consistent steering so easier to drive.
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