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8ft spud gun

Post questions and info about combustion (flammable vapor) powered cannons here. This includes discussion about fuels, ratios, ignition systems, safety, and anything else relevant.
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Unread postAuthor: Sticky_Tape » Mon Feb 25, 2008 2:10 pm

sthorne wrote:kewl, with a 1.5" barrel of that caliber, may i suggest using a heavier ammo?

suggestions:
*D batteries
*bouncy balls (the big ones)
*mini tennis balls (for dogs)
*or even make your own pvc rockets :D

--sthorne

I would just like to say before you might buy d-cell batteries they fit perfectly in a 1.25'' barrel rather than 1.50''.
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Unread postAuthor: Jared Haehnel » Mon Feb 25, 2008 2:15 pm

If you toss in a few extra bucks you could do both, just buy a few extra pieces...
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Unread postAuthor: Arcticpheonix » Wed Mar 19, 2008 11:00 pm

MaxuS the 2nd wrote:
Jared Haehnel wrote:t has always made sense that barrel should be more volume then the chamber because of the expanding gases during combustion.


You're right, but a barrel shouldn't be of much larger volume than the chamber because the pressure would decrease too much.


If you were to make the barrel out of a stronger material (say copper pipe) then the barrel (typical ABS/PVC), would you be able to reduce the barrel length (and thus the volume) in order to keep more pressure?
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Unread postAuthor: MaxuS the 2nd » Thu Mar 20, 2008 3:07 am

Not really, the volume isn't going to increase/decrease with the strength of the material.

Don't worry about ratios too much if all you want is a 'fun gun'.
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