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How fast is a knot, anyway



Hey Guys - Hope this isn't too stupid, but how fast is a knot?  I downloaded the specs on the US SUBMARINES  NOMAD model and it says that it will travel 3.3 hours submerged at 5 knots.  That is the same speed that the little ambient SportSub is supposed to be able to travel.  That seems somewhat slow for a Million +  dollar vehicle.  Is this normal for a sub? Is it "fast enough" when you are actually underwater, or is the NOMAD all show and no substance?
 
Thanks,
 Greg