Surly

I love it so far Effe. As already said there is no need for a diff between the axles. On each axle the wheel on each side can turn at a different speed to the one on the opposite side of the axle and as such ALL four wheels can be turning at different speeds. It is hard to tell from your picture if your setup does this but bogie drive trucks have a system that allows the axles to step a little sideways when they turn to help limit the amount of screwing done to the tyres. If you watch the rear wheels particularly on a front lift garbage truck turning in a tight area you can see this. Look forward to seeing it grow. cheers Surly

I have spent a lot of time on Sheepo's site looking at his awesome creations. I wonder if his 911 self centres when driven as a result of the caster? cheers Surly

Self centering steering in real vehicles is created by a combination of toe in and caster. Does anyone use or tried these techniques in their MOC's to any effect? cheers Surly

What an awesome build! Did you consider adding non Lego options like the mindsensors Pneumatic servos or PS2 controller? cheers Surly

Both the Peterbilt and Kenworth are awesome replicas of the real thing. Personally I prefer the Peterbilt and part of that is the use of dual wheels. Super singles are used frequently in Australia as steering tyres and on tri-axle trailers but rarely as drive tyres. I am looking forward to seeing more of your creations BoW :) cheers Surly

Why do people make such awesome trucks but fail to remember trucks have dual tyres on all non steering wheels? cheers Surly

Not really an answer but the lego steering systems I have seen do not incorporate the normal methods vehicles use to self centre the steering being castor, kingpin inclination and to some degree toe in. I am not sure how you could implement all of them but castor could be included by using a turntable to mount the kingpin and turning the outer race one or two teeth. I am not sure if this would generate sufficent force to float a steering motor back to centre though. Just thinking out loud really cheers Surly ps as this is my first post I must say I am in awe of some of the MOC's and skills members here display.