Josef Papp

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Josef Papp (1933? in Tatabánya, Hungary – April 1989 in Daytona Beach, Florida) was an engineer who was awarded U.S. patents related to the development of an engine, and also claimed to have invented a jet submarine.

Papp was issued several U.S. patents for these inventions, including his noble gas fuel mixture.[1]

The engine continues to be considered by many scientists as a hoax. Papp's poor physics theoretic background is demonstrated in the abstracts of the patents, which had been criticized by Richard Feynman.[2] Papp presented to an audience, including Feynman, an ill-fated demonstration in 1966, in which his engine exploded, killing one man and seriously injuring two others.[3] Feynman's conclusion was that Papp was a fraudster and the explosion an attempt by Papp to avoid discovery, although he notes that Caltech settled with Papp out of court.[2]

See also[edit]


  1. ^ (U.S. Patent Nos. 3,680,431, U.S. Patent 4,428,193, and U.S. Patent 3,670,494)
  2. ^ a b R. Feynman on Papp perpetual motion engine; Originally published in LASER, Journal of the Southern Californian Skeptics
  3. ^ "The Dream Machine" By David Ansley San Jose Mercury News (August 27, 1989), p. 8 -- retrieved from : "Papp became frantic; the engine was running without any controls, he said. Feynman relented and gave up the plug. Papp put it back in the socket right away and the engine blew apart ... A Mattel engineer died"

External links[edit]

  • Papp submarine page in the museum of hoaxes
  • Sutton, H.I. (12 January 2015). "300mph home-build Supercavitating midget submarine". Covert Shores Blog.
  • U.S. Patent 3,670,494
  • U.S. Patent 3,680,431
  • U.S. Patent 4,428,193