2026-10-08 Papp 1968 demonstration (Museum of Hoaxes, Wikipedia, Google)
Queries: Joseph Papp inert gas engine 1968 explosion TRW observers lawsuit; "The Dream Machine" Papp hoaxes.org; Papp sued Feynman Caltech engine 1968 lawsuit settled. Saved: research/pages/hoaxes-papp.txt, hoaxes-papp2.txt, wiki-josef-papp.json.
- David Ansley, "The Dream Machine", San Jose Mercury News, Sunday 27 Aug 1989, West section p.8 (Ansley was the paper's science and medicine editor), reprinted at https://hoaxes.org/comments/papparticle.html [web]: - "Too many sensible people helped him build it and run it. Too many engineers say they couldn't find a hamster inside. The U.S. government gave it two patents." - "Big companies were interested: TRW, Lockheed, Rockwell. The Army and the Navy made inquiries." - November 1968 demonstration: engineers, reporters, a TRW attorney "with a $3.5 million contract in his pocket" (per Roser, Papp's partner), Caltech students and Richard Feynman. After Feynman's dispute over the power cord, the engine blew apart; "A Mattel engineer died ... Eight others were badly wounded." - Afterwards Papp's partnership with Roser collapsed and Roser sued; later investors sued UPC, and in July 1988 a judge ordered them to work with Papp; Papp died in April 1989 without leaving the fuel formula.
- Feynman's account, "Feynman on Papp", from LASER (journal of the Southern California Skeptics), at https://hoaxes.org/comments/papparticle2.html [web]: three men injured, one died; "Mr. Papp sued me for ruining his engine, charging that my stalling around with the cord caused him to lose control of it"; "The case was settled out of court, and Mr. Papp was paid something." Feynman held that the engine was a fake (his characterization; he was a party to the suit).
- Wikipedia "Josef Papp" summarises Feynman's view and the Caltech settlement [web: https://en.wikipedia.org/wiki/Josef_Papp].
- A Medium essay by Doug Arcuri (Google snippet) says "Authorities found no explosives" after the explosion; not opened. This is a counter-point to Feynman's explosive-charge hypothesis and should be traced to a police or court record.
- Patents: US 3,680,431 (priority 1 Nov 1968, Environetics Inc) and US 4,428,193 (1984, Papp International Inc) [web: Google Patents].
Conflicts: injuries "eight others badly wounded" (Ansley) vs "three men injured" (Feynman). Kelly's chapter 8 describes a 1968 cylinder detonation and a 1983 certification test [read: facts.json, Chapter 8 entry]; neither source here covers 1983. Records to obtain: the Roser v. Papp suit; Papp's suit against Feynman/Caltech (Los Angeles County court, about 1969-1970); the coroner's record of the Mattel engineer's death; the investors' suit against UPC (1988 order).