Ok, I can't get the actual video file on, but i took out four frames from start to end so here they are. Yes, its strapped to a tree.
This is first smoke coming out after delay fuse burnt out.
One problem with sulfur/zinc powder smoke is that when heated and compressed it can become flamable. I also made the mistake of making the delay fuse housing out of plastic. It caught fire and then ignited the smoke in large bursts of flame for about ten seconds until the plastic was incenerated.
Back shot after flames stropped.
I think in the next test it will run much better with a metal fuse housing.