Not only will it drop some but keeping it from shifting around while applying forces to it is close to impossible. It takes a lot of power with very fine control.
Personally I think they would be more successful with a SWATH barge where most of the mass was below the waves. But that would also effect the roll center.
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(Larrabee's Law) Half of everything you hear in a classroom is crap. Education is figuring out which half is which.