[bobmcnamara]

Ours in highschool was gas powered. We worked out the ratio for a good burn and found a similarly sized metal scoop. Once loaded we'd shake it until the gasoline was fully vaporized.

It was terrifyingly loud. We'd wrap stones in duct tape, spray them with oil, then shoot them through sheet metal. Put a few through some old steel chairs. Tore the cover off some golf balls.

I suspect it may have reached higher pressures than my bike tires, but I never really considered trying to measure it.

[phreeza]

That sounds pretty terrifying!