This Military Prototype( FLEXING TEST BOAT) Ultra Jet 251 was the only one built. ( the patent for the boat is available to the buyer) The owner says it provides the fastest and smoothest ride on the water a boat this size has ever offered, with a g-force of 13. It has very high propulsion efficiency. Just think of the outer wall on this boat is absorbing the G-Factor as it moves up to make contact with the inner wall. The total boat is also flexing which does not happen with a fiberglass hull. The boat offers super maneuverability. The boat is lightweight and compact for transportation pu...