on the nature of pushing things...

I'm currently working on a simulation in which two or more vehicles 
push each other around (and perhaps out of) a ring. The vehicles are 
based on those in the Braitenberg class, with the addition of a target 
attached to the rear of each vehicle and a "navigator" attached to the 
front. The navigator detects the closest target and determines the 
correct wheel movements necessary to steer its vehicle towards the 
target.

I'm very new to breve, so I was surprised to get things working as well 
as they are:
http://toasty.mcs.muohio.edu/~moosejc/battle.tar.gz
(Every once in a while, the navigators mistakenly drive the vehicles 
away from each other. If that happens, just restart the simulation.)

I'm currently trying to figure out how to make the vehicles actually 
push each other. As it is now, when one vehicle tries to push another, 
its wheels spin, but there is no movement. What do I need to adjust to 
allow pushing? I've tried a few things with the "set-mu" and "set-eT" 
methods, but haven't had much luck. I would greatly appreciate whatever 
help you can provide.

Thanks,
John

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