it's only 250kg on a tared road only because it's level and the friction is the same across all 4 tires.RED60 wrote:How about this.... a vehicle weighs 1000kg... with all 4 wheels on the ground and with the weight evenly distribured there's 250kg on each wheel..... if we drive that vehicle onto uneven ground we may end up with 400kg each on 2 of the wheels and 100kg each on the other 2... if we were in a bad traction situation having 1 of the wheels with 100kg on it, lift of the ground the weight it was supporting is transfered to the other wheels giving them more traction, possibly enough to get it out of the stuck position... while this is a simplified version of what happens, the principal is the same....grimbo wrote:all I can say is what I said. i have seen some very flexy, very light vehicles just spinning all 4 wheels on an obstacle not going anywhere whilst a less flexy rig crawl through by lifting a wheel. So from that I surmise that the contct pressure on the flexy one is less than the wheel lifter. Yes it is strange but that is what I have seen. Never said that flex is bad or whatever else you want to try and read into it, just seen thatnastytroll wrote:Not being a smart a$$ but I'm also curious, you could read it as if you fit limiting straps it woud improove drivability. Sounds alittle strange to me.Dozoor wrote: Now Explian to me all you "know all " suspension gurus ,
how will the tire spin more by not being loaded up by the suspension ?
Common come get some !
The forrest rover is wild tho I doubt it's a big flexer...
goto a un-level road, which is river gravel for example and the weight but also the frioction on a surface will change as well.
you can only move forward or backwards if your tires are rubbing against something (friction) if the surface also moves then your friction will also reduce by so much.
Sand would be a classic example of having either plently of friction as in you move but don't get stuck or no friction and suddenly your stuck and your tires will happily spin all day long.
then you have the drive train which gives all the power to the wheel of least resistance so having 1 wheel up in the air will be given all the power no matter how much weight is on the wheels.
that flexing truck would have all wheels to the ground but anything you have not nailed down will also help to tip over the front or back end of the truck, the shifting of weight won't be great.
in those pics I'd hate to be the driver of that tip truck because if you kept going forward you'd dump half the load of dirt out the side of the tray and probably flip the whole truck over as well, simply due to the sway of the dirt pulling the whole lot over as well.
I think it's one of those "it's a super great concept but as a real life truck it simply doesn't work as it was meant to on paper" and I think people forget about the other details like shifting of weight etc.
you could stop some of the side turning but it'd put extra stress on the split part.
same deal for the wagon truck just think of all those tools (extra side G/weight) banging around from side to side everytime you go over a bump then speed will increase the problem.