Sea Lion Prototype ranks among the fastest amphibious cars of its era

The Sea Lion Prototype, designed by Marc Witt and SeaRoader Aquatic, is a rare and innovative amphibious car that debuted in 2012 as one of the fastest dual-mode vehicles of its era. Powered by a Mazda 13B rotary engine paired with a supercharger and Holley carburetor, the 1.3-liter motor uniquely drives both the rear wheels on land and a jet pump in water, eliminating the need for separate propulsion systems. Its lightweight 5052 aluminum alloy body features a monocoque structure for rigidity and corrosion resistance, balancing aerodynamic and hydrodynamic efficiency. A standout feature of the Sea Lion is its shape-shifting suspension, which hydraulically retracts the front wheels and extends side pods to serve as flotation devices and cargo carriers, enhancing stability and speed across land and water. The water propulsion relies on a Berkeley 12 JC jet pump that provides thrust without exposed propellers, improving safety and reducing drag. The cockpit combines conventional driving controls with a joystick