QUAD H20

[electrotor]

This is just a frame so quite expensive at $759. Have a look too at the build guide and video. I doubt if it could handle more than sea state 1.

http://www.quadh2o.com/

http://www.quadh2o.com/resources/the-quadh2o-build-guide/

The amazing QuadH2o™ Quadcopter landing on water

[FPVSteve]

Why do they put the whole body in the water - if they put some plastic booms underneath it could probably handle a bit of choppy water, but any sign of a wave at the moment is going to swamp the props and stop you from lifting off again.

I'm thinking along the lines of those heli-trainer struts with the balls on the ends.

[FPVSteve]

But obviously with a lot more surface area for buoyancy.

[Dizzy]

I just would so much like a flying sub like the Voyage to the bottom of the sea had :D sigh  ;)

dizzy ;)