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- #21
I think if I had more than three axles and was running onroad this would be something I would consider. I had tried a reduced middle axle travel setup in the past by reducing servo throw but discovered it just was not worth it since it increased the risk of tire-on-tire scrub. Traction scrub itself is going to happen even if I had perfect Ackermann angles since monster tires are so wide... so I figured just to say forget it and go with maximum and equal steering travel on all axles.You should really look into programmable steering, seen lots of multi wheeled, multi steer trucks in real life and the tires don't all turn at the same rate or angle for efficient steering. During tandems rear steer the arc the tires traverse is different and require different levels of steering input for a nice transition and not scrubbing the heck out of the tires. May not matter much on dirt, but i would expect better steering response non the less. Look up Mobil cranes for some easy reference material. Something above 75ton lift. (Largest I know of that does not have rear steer as standard) the 210 we most recently used had triple rear and duel front axles. They all steered. Was just art to watch it move around obstacles.
I do have to agree with you how neat the multi-programmable steering is on something like Liebherr cranes- as they can do semi-automatic mode changes from crab to claw steering on the fly. It just isn't a good fit at all for my trucks. Thanks for the heads up though!