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Originally Posted by LoBlo
Sub displacement is always given in tons, but which "tons" is it...
... the imperial ton = 2000lbs
... or the metric ton = 1000 kg
There's sufficient difference between the two. Anyone know which one is generally used?
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Sorry, but it's neither.
Ship displacements are always in "long" tons = 2240lbs. This is why early British guns are rated in "hundredweights" (i.e. 12pdr/45 8cwt). One hundredweight is 112pds, so 20 hundredweight (or cwt) is one long ton.