IN Sand:
The leading single tyre pushes a small amount of sand infront of itself .. and compacts that which it rolls over ... let us say drag = A
The next tyre in line with the first .. does a similar job to the first tyre .. but because of the compaction of the first tyre has less sand to push .. and less compaction takes place .. drag = A-B
If you run a third tyre along side the second tyre (on the same axel) it has the same drag as teh first tyre .. drag = A
If you run a third tyre behind the second tyre (a third axel) then you have even less drag drag = A-2B say as an aproximation. In the past (1950s?) Leyland Badggers were configured this way .. and prefered for the Birdsville Mail run (lots of sand hills with a heavy load) for this reason.
You cannot do anything in your driving style to change this...
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Letting both tyres down on a single axel twin wheel .. may lead to the sidewalls of each tyre rubbing against the other one .. so don't do it for long distances .. nor do it at speed...
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Regards Frank Warner
motorcycles BMW R80 G/S 1981, BMW K11LT 1993, BMW K75 G/S
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