The 18′ foiling catamaran seen recently flying over the waves off the coast of Essex in the UK, was a small boat testing a very big concept. As it flew during the two-hour sea trial, the boat drove an underwater turbine that generated electricity which then used electrolysis to split seawater into hydrogen and oxygen.
During the test run, the generator filled a six-liter storage tank with clean, green hydrogen; the only by-product was oxygen, which was vented. The boat actually produced so much electricity that, if the tank had been bigger, it could have made 60 liters of hydrogen.
Drift Energy, the British startup behind the project, claims that the foiling sailboat is the first in the world to generate clean hydrogen using just the power of the wind while under sail.