On 8 October 2013 17:14, Justin Richards wrote: > Is it ok to discuss the details of a particular gas cannon I (and friends= ) > experimented with when I was young. > > That is propellant, projectile and construction. > I'd say sort-of / maybe, with due care. I'm interested in such and there are lessons to be learned re safety, life experiences etc and even about just what it takes to do various things BUT we do not want to stray into anarchists cookbook territory (relatively rubbishy fwiw) or how to xxx in vast detail (enough of that in graphic detail on You tube. And we'd like to avoid things that people getting this on an at-work feed would blanch at. Bob is a bit more conservative on this than me (as he has a greater eye on where such things can go) and other admins may weigh in if they feel strongly enough. Start slow, be careful, watch for signals at the mast-head and see how it goes. Odds are, anythingt 'instructional' re actual devices is easily outclassed by what you'd find in 2 minutes on BinGool and the human interest factors are the main draw. TBD :-) Russell. Gargoyle: 846,000 Potato Cannon Select images. Wow. Agh. OK. No shortage of DIY there. Pages and pages. --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .