I know this is unrelated, but it's too badass to let go.
In high school, the guys one class in front of us (they were seniors, we were juniors) built a potato-gun for Technological Studies (senior-only class you can take, self-motivated class).
You are probably thinking of the kind where pressure is used by forcing a ram stick down into the back of the barrel to force the potato out.
They used ignition. Seriously.
They filled the "chamber" with hair spray (a shitload) and they had an ignition spark switch at the beginning of the rifle. You hit the switch, it ignites the hairspray, and good God almighty did that potato fly like a bitch. It was awesome. We're talking launching a potato chunk hundreds of yards. Crazy.
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Off the record, on the q.t., and very hush-hush.
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