Carryfast:
Kyrbo:
Carryfast:
… But the issue,of the possibility of one side losing traction,when running at slow speed or stopped,also applies to single drive axles just the same,but you don’t have the advantage of being able to use the traction provided by having the combined traction co efficient of the two drive axles just like I said in that case.
But with one drive axle you get wheel spin later than you get with 6x4 (due to one side losing traction)
This is because 6x4 has lower axle weights per drive axle than lorries with single driven axles, like has been stated in this thread. In practice this means you get further with single drive axle than with 6x4 as long as your drive axle tyres reach solid surface AND you know how to use equipment you are given, especially when you have 6x2. For example newish FH’s (FH12 at least from Mk. 2 onwards) transfer weight from lift axle to drive axle with a single button press so that drive axle gets loaded to legal maximum weight. With a second press of that same button drive axle gets loaded 30% overweight. For what I know this is factory fitted standard feature on all three+ axle FH’s (and FM’s) with rear air suspension.
BTW as you like the Youtube clips, here’s an great example showing what single driven tyre means with a 6x4: http://www.youtube.com/watch?v=UobLbfRZloA
You’ve forgotten to factor in the combined ‘total’ traction/grip coefficient put to the ground of two drive axles loaded at less individual weight each (9.5t x2 ) versus a single one loaded at 11t or probably less in the real world with a 6x2 configuration.
No, I’ve not forgotten it. I just didn’t mention it as doesn’t matter that much as long as your drive axle tyres can reach something solid. On the other hand, it does matter pretty much when you’re driving on something where this doesn’t apply, like a mud, sand or deep enough sleet.
Carryfast:
But the example of the dustcart just proved that it was’nt fitted with,or using,diff and crosslocks and that if the obstruction is good enough it will stop anything including a tank

It also showed pretty well what “driven by single tyre” means if one can interpret what one saw.
“Driven by single tyre” means that without cross or difflocks or traction control vehicles ability to transfer force to the surface is limited by the tyre which has least traction. Lift a single tyre from a drive axle of your choice into the air and only that wheel will rotate when you lift a clutch and vehicle doesn’t go anywhere. It doesn’t matter whether the vehicle is 4x4, 4x2, 6x2, 6x4 or 8x8 (ask from any off-road hobbyist if you don’t believe me). Lift a driven tyre from a 8x8 and it doesn’t go anywhere, lift a driven tyre from a 4x2 and it doesn’t go anywhere, lift a driven tyre from a 6x2 and it doesn’t go anywhere and lift a driven tyre from a 6x4 and, the shock, it doesn’t go anywhere. In practice this means that once one wheel starts spinning and you doesn’t have enough momentum, you’ll stop, engage locks and hope that you get going again.
Carryfast:
But no one ‘ordered’ anyone to stop in Northampton or any of the other British motorways and roads that get blocked by stuck 6x2 and 4x2 artics every time we get a few inches of snow here.
And no one has ordered a stop on a Finnish road network when few more inches of snow fall down, and, lo and behold, even the 4x2 artics kept going without blocking the roads.
Maybe you can’t put all the blame nor praise to the drivetrain as there MIGHT also be some other factors contributing for surviving in slippery conditions.