Idaho Howitzer - My first build ever!

Show us your pneumatic spud gun! Discuss pneumatic (compressed gas) powered potato guns and related accessories. Valve types, actuation, pipe, materials, fittings, compressors, safety, gas choices, and more.
Admiral Korax
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Sun Sep 13, 2015 10:16 pm

The best way to describe my first spud gun is to share the link: http://www.idahohowitzer.info

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jrrdw
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Mon Sep 14, 2015 11:50 am

Nice work. Question: What were the build rules for the competition? Got a link to them?
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jackssmirkingrevenge
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Wed Sep 16, 2015 6:44 am

The best thing about this is that you got the family involved :)

Have you considered using a burst disk for more power?
hectmarr wrote:You have to make many weapons, because this field is long and short life
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jrrdw
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Thu Sep 17, 2015 6:44 am

jackssmirkingrevenge wrote:The best thing about this is that you got the family involved :)

Have you considered using a burst disk for more power?
Makes me wonder how much pressure can be achieved using this method??? Was there a limit per the contest rules?
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jackssmirkingrevenge
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Thu Sep 17, 2015 7:23 am

Depends on the concentration and quantity of the chemicals being used, and the size of the chamber in which they are contained.
hectmarr wrote:You have to make many weapons, because this field is long and short life
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jrrdw
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Thu Sep 17, 2015 5:39 pm

Yea I was going with what he has built...
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jimmy101
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Fri Sep 18, 2015 12:42 pm

jackssmirkingrevenge wrote:Depends on the concentration and quantity of the chemicals being used, and the size of the chamber in which they are contained.
Only up to a point. Eventually you reach the pressure limit of CO2 in air versus dissolved in the water. Once you reach that limit most of the additional CO2 stays in the water.

A pretty good estimate of the maximum pressure you can obtain with vinegar and bicarb is that it'll reach the same pressure as a bottle of carbonated soda. The pressure in a can of soda depends on the temperature and the amount of CO2 dissolved in the water. Typically values at room temperature are in the 30 to 60 PSIG range.
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