-many of the pix in the 50-100 range feature a kneel down inboard 3pt hydro powered by a 2 stroke triple. Looks like the east German car motor? [Wartburg?]
Surprised they van get any signifivant hp out of that, but they seem to be going 60 + mph.
Looks affordable too, and fun!/
Also one pic of a 500cc lay down with a wing across the stern.
Always wanted to try that.
Bookmarks