Originally Posted by atoll
metric tons or imperial! big difference!
1 imperial ton = 2240 pounds,
1 metric tonne = 2205 pounds
The difference is not worth worrying about for lift
My sailboat has a displacement
(weight) quoted by manufacturer of 7.2 tons,
a gross tonnage of 13.65 tons, and a register tonnage of 13.65 tons.
The 13.65 tons is based on a cargo capacity of 38.63 cubic meters.
But I still have problems storing supplies for two people for 1 month
This is an anachronistic measurement, nonsensical for leisure craft, but it is used throughout the world.
The tonnage has nothing to do with weight. A tun is an old name for a standard barrel (252 imperial gallons), so it is a measure of how many barrels you can theoretically carry in your hold.
33 tons means you should be able to fit 8,316 gallons of rum