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General Plasma Gun on a shoestring budget (Instagram)

I guess it is just superheated gas.
Ordinary fire flame is just a combustion plasma.
This looks like a "flame front" (the tube winding) which is long enough to prevent a back pressure from reaching all the way to the lighter torch when the thing "blows" a shot forwards. The fuel rich/oxygen poor flame front reaches the rear 5 gallon bottle, which is air rich/fuel poor and the flame front just IGNITES the air. Then, just like a rocket, it's "easier" to blast that overpressure out the forward 5 gallon bottle and there's "enough of a nozzle effect" for the expansion that you get something that behaves very much like a single flame pulse rocket thrust (hence the recoil kick seen in the video).

Pretty ingenious stuff. :cool:(y)
 
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