Feynman's account is at http://www.museumofhoaxes.com/comments/papparticle2.html
Infinite Energy description : http://www.infinite-energy.com/iemagazine/issue51/papp.html
Papp demonstrating his engine with a dynonometer : http://www.youtube.com/watch?v=L7wZqDQ7Pjg
The video is discussed at : http://hutchisoneffect.ca/Academy_Video%20of%20Jimmy%20Sabori%27s%20Papp%20Engine%20Variants%20-%20PESWiki.htm
New Energy Congress member, and science advisor to PES Network, Ken Rauen, who has had extensive direct involvement with the Joseph Papp engine technology, says that what is shown below as a working device is not Sabori's work, but that of Joseph Papp, and that Sabori's work is not worth chasing. He provides some background in who's who in the field, including some developments that are imminent.
