For those interested, Infinite Energy magazine devoted one issue to the Papf/Papp engine:
http://infinite-energy.com/iemagazine/issue51/index.html and they have some back issues for about $6. One article is available from the net: http://infinite-energy.com/iemagazine/issue51/papp.html Another article is an eye witness account of the explosion on p31: Witness to the Papp Engine Explosion: An Interview with Cecil Baumgartner which someone with a copy might summarize (hint hint).
