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hmm. I haven't built a snowball launcher. But I have built a potatoe . . . no, gun isn't the right word. lets say cannon. I betcha It would handle a snow-cylinder. Say, 3, 4 feet long, 2 inch diameter. Put an icilcle in there if you want more, errr, results.
Anyway, my cannon is huge. The barrel runs the length of the gun (10 ft) so as to have the greatest possible time with high pressure behind it, more time to accelerate. Its air pressure, with an upper and lower chamber, both about 5 feet long, 4 inch diameter. The barrel runs through the upper chamber (it looks real good) but is not connected (we had some problems with leaks there, but you can't solve with lots and lots and lots of caulk.) You load in the back, bigass trigger/valve is also back there.
The one I patterned it after can shatter a cinderblock. Shatter, not break. I haven't fired at any cinderblocks yet, tho.
We were gonna mount it on a swivle stand in the back of a friends pickup, but he backed out. Coward.
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There are laws of physics, useful rules of thumb, and cold hard economics that come into play to be sure but at it's core Engineering is Art. For these artists, there is no substute for the sound engineering judgement.
- Joe Johnson [more] 
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