[djmcnz]

Originally Posted by discostu

ok re read still confused

I assume you understand what akerman is and what moving the inner or outer link forward or rear would do to both inside and outside wheels. is all to do with the arc of a circle.

stu

Originally Posted by 94eg!

Here's my observations from your photos...

Using back of block
- More outside wheel angle at full lock (bottom pic left side)
- similar inside wheel angle at full lock (top pic left side)

Using front of block
- Less outside wheel angle at full lock (top pic right side)
- similar inside wheel angle at full lock (bottom pic right side)

Conclusion: Mounting to the back of the block results in a reduction of ackerman at full lock due to the very obvious increase in steering angle of the outside wheel. The straighter link on the outside turns that one wheel more. This is how ackerman adjustment works on RC bell-crank steering.

Okay, I obviously didn't do a good job of explaining my testing and findings... Sorry if that lead to unfair criticism!

Let's try this:

I concluded that using the back of the bridge is a bad idea. Tamiya got it right.

Using the back of the bridge effectively reduces the possible maximum angle of the outside wheel and will significantly reduce your turn in and turning circle. The inside wheel is almost identical in most configurations.

A wider arc for the inside pivot of the steering rod is desirable.

The pics above are representative only, simply to show the effect. To avoid posting 12 pictures that look almost the same I used a different configuration left/right to illustrate my point (obviously not so well! ).

As for Ackerman... well I need to concede that I simply don't know enough about this to argue the point one way or the other... and I probably can't be bothered to learn enough to be convinced either way...

But for sure, this is not a "mod" that my evidence suggests would be worthwhile.

Apologies if I wasn't clear or conclusive in my previous post...