You Won’t Believe These Planes Never Made It To Production

Nation: United States
Max Speed: 513 mph
Interesting Fact: Built in Convair’s San Diego facility at Lindbergh Field and tested in San Diego Bay.
The prototype of the Convair F2Y Sea Dart was fitted with one experimental ski, which was actually more successful than the twin-ski version. Nonetheless, the aircraft/watercraft experienced issues during testing that prevented it from graduating past the prototype phase.