The pic is from a 26 bertram that has two of these installed. The are connected to mercruiser drives. This guy selected these motors over standard 6 cyl i/o power.
They have a real small footprint from what I can tell from the pics.
Alright. If we can design one that runs on Hydrogen like those New zeland boys have, then I'm in. Then we would have to set up a net work of places to buy the hydrogen like Boatersworld or west marine then we can retire in the keys with a V35.