some really neat designs pictured. Certainly brought out some creative mash-ups.

I think my money would be on the lightweight trimaran with the rowing chair/oars...

How much horsepower can a human produce on a bike/propeller setup?

I suspect that may be slightly less than the total work produced from a rowing chair?

And if you're rowing/pedaling you'll be in displacement mode, so weight and waterline would rule supreme I suspect?

Once sailing, windspeed and wave conditions would likely ferret out the top platform...

Given those two criteria, I'd focus on the displacement mode (since that will eat up the most time/distance) but hope for great sailing conditions...