Ultimate upwind efficiency

Fascinating

How do you define port and starboard tack etc for colregs?

Also those big blades whirring around in a marina must scare rigid any other boat within range!

Guess its a (wind)power driven vessel!?

its got an engine running in the marina bit of the video you can see the watercooling out the back, but its going under its own steam at sea and theres plenty more videos out there. Lots of people experimented with models, its curious seeing the things sail directly into the wind. It must take a huge slow turning propellor to get a bite on the water though. thats probably why the models work better than the full size ones.
 
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