I like uncle Dick's description of a potato gun, but a friend of mine who knows quite a bit about them has a few suggestions, although I certainly don't recommend trying them. First 3" is too big for a barrel, unless you're shooting very big potatoes. 2" or 1.5 inch is plenty big. (Make sure to file and edge on the front of the gun. This makes cutting into the potato easier. You can also wax the inside of the barrel for added distance.) Second, hairspray, such as AquaNet, has most of the universe's known flammable substances in it. Read the label for fun. Nonetheless, it's not an ideal propellant, especially as you have to be careful to not get your igniter wet when spraying. Propane, such as from a small torch used for sweating copper joints, works more consistently. Oxygen and acetylene gas, such as from a welder, work really, really well. My friend claims to have shot a potato over 1/2 mile with such a mixture. For some odd reason I believe him. Be very careful, though. Always start with a very small amount and work up to what you feel safe with, at least that's what my friend says. At one time my friend figured out the muzzle velocity of his spud gun, but he's forgotten the figure. Anyone who follows my friend's advice does so at his or her own risk. Peter ============================================================================================================= To unsubscribe from this list, go to www.freelists.org and logon to your account (the same e-mail address and password you set-up when you subscribed,) and unsubscribe from there.