The prototype machine looks almost identical to first-generation standup jet skis. Beneath the conventional-looking hull, though, is a large boom leading down to a hydrofoil and underwater ...

David Robert Herbst, 25, was reportedly riding a rented jet ski when he collided with 58-year-old Russian tourist, Kirill Golovachev, who was swimming in a designated area off Karon Beach.

Early sales ended up being sluggish, resulting in the craft being shelved for a number of years. Upon the patent being released, however, Jacobsen submitted his idea to Kawasaki, the result of which ...