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DPRoberts said:Speaking of fire hazard, yet another project is to fill a balloon with hydrogen and oxygen from a fuel cell. Intended to be hit with tracer ammo. Lots of issues to work out on that one. </div></div>
If you have an oxy/acetylene torch and balloons you can make some dandy explosions. Tracers work well for ignition.
But the acetylene slowly leaks out of the balloons, so you have to blow them within 20 minutes or so.