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HMS Dundee. May all that sail in her be safe. Remember women and children first is mostly a myth Dundee!

OK guys, we are coming at this all wrong. ARdave, stuff the science, build a ramp, hit it at speed and jump the bloody river.

Understand that but if all that Baldbob did was pump the tyres and the quad went from sinking to floating then the physics tell me that something about the tyres size had to change (i.e. an increased...

Triple B's suggestion of over inflating the Tyres is soun. By doing that the surface area of the Tyres would increase and therefor they would displace more water which would increase buoyancy.

ARdave here is a thought. As an added measure strap an empty 20 litre water container low on to the front and the back of the quad. That will displace forty kilos of water and as water weighs a kilo...

Anything will float as long as the weight of the object is lighter than the weight of the water that the object displaces. So either biff the dog off the quad or put the quad on a boat, Either one...