Just happened to be thumbing thru a back issue of HB Mag (Jan. 96) and guess what, an article on a rotary powered jet boat. The boat was built by Ebbtide in TN it was a 19 ft. with 8 ft. beam and weighed 2300# it was model RXR-19. It came with a Mazda RX-7 engine marinized by Rotary Power Marine in Spokane, Wash. it was avail. with a supercharger also. The pump was a Dom. 12 TD top speed 45 mph, or 55 mph (blown). It produced 270 ft/lb of torque at the pump.