This is a nice effect:
http://technabob.com/blog/2015/05/18/diy-propane-rifle/
Wrapping the tubing gives the flame front the appearance of a longer transit time. You could imagine doing a helical wrap around a clear tube and getting a nice mostly-linear effect. And using the propane torch as the mixing element is also nice, because it's designed to mix air-propane at the inlet. No calculations needed! Might even be able to modulate it by modding the inlet a bit...
http://technabob.com/blog/2015/05/18/diy-propane-rifle/
Wrapping the tubing gives the flame front the appearance of a longer transit time. You could imagine doing a helical wrap around a clear tube and getting a nice mostly-linear effect. And using the propane torch as the mixing element is also nice, because it's designed to mix air-propane at the inlet. No calculations needed! Might even be able to modulate it by modding the inlet a bit...
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