Half of a two-part project, the other part being "OBA on a Toyota."
A friend of mine is making a short film which requires some simulated explosions. Since he doesn't have an explosives lisence and we will be shooting some scenes on public property and in generally public locations, we need a solution that is both legal, cheap, portable and, last but not least, effective.
Several months ago I watched the extra bits at the end of "Gods and Generals." One of their locations was historic Harpers Ferry, which, being a national monument, precluded the use of pyrotechnical effects. Instead, they used what basically amounts to an air cannon to send a cloud of styrofoam debris and dust flying into the air. No fire, but it looked pretty convincing in the movie. So that little idea lodged itself in the back of my mind to sit and stew until the opportune moment. Lo and behold, the moment came several months later.
So here's the basic idea:
Take an air tank, attach it to some sort of a cone or tube which gets loaded with the simulated debris. In between the two, have an air hose of some reasonable (but not too long) length. Electric trigger for reliability's and discharge speed's sake. Oh, and try to do it for under $200USD.
So here goes nothin'...