REVscene Automotive Forum - Project Sea Lion

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The Sea Lion purports to be the world's fastest amphibious vehicle and has been custom designed from the ground up for just this purpose. Incredibly, it uses a 1974 Mazda Rotary 13B engine making 174 HP (though the seller suggests replacing it with a 300-600 HP RX8 Renesis lump). For water travel, the Sea Lion uses a jet ski-like jet drive. These power plants let the beast achieve 125 mph on land and up to 60 mph on water. Not bad, especially when you think about the comparatively glacial pace of Amphicars and Schwimmwagens.

http://jalopnik.com/sea-lion/
If James Cameron ever decides to make Aqua Man...he'll need this in the movie :fullofwin: