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If my math is correct, with a buoyancy to support 400kg, a 250kg quad, and using 560mm diameter barrels, approximately 350mm of the barrel will be submerged and 210mm above the surface.

The blue 220l drums should support approximately 220kgs each, keeping in mind that the barrels would be fully submerged at this point. Depending on the weight of the quad (assuming approx. 250kg) 2...