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spud gun help

A place to ask general spud cannon related questions.
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spud gun help

Unread postAuthor: aaron1023 » Wed Jun 04, 2008 11:50 pm

i built a generic spud gun and the thing shoots like ten feet. once out of like 30, i got a loud good shot... but the potato didn't even come out. please help???
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Re: spud gun help

Unread postAuthor: starman » Wed Jun 04, 2008 11:56 pm

aaron1023 wrote:i built a generic spud gun and the thing shoots like ten feet. once out of like 30, i got a loud good shot... but the potato didn't even come out. please help???


Aaron, we'll need much more information about your gun before we can help you...some pictures would be very helpful as well.

Is it a pneumatic or combustion, how big is your chamber/barrel, what you using to trigger it, what fuel etc...
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Unread postAuthor: aaron1023 » Wed Jun 04, 2008 11:59 pm

combustion, barrel: 2ft and 1.5", chamber: 1 foot and 2", i use a lantern igniter, and tag body spray
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Unread postAuthor: drex » Thu Jun 05, 2008 12:03 am

you used a lighter? do you have a hole drilled into your chamber? if so the combustion gas could escape threu the hole.
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Unread postAuthor: starman » Thu Jun 05, 2008 12:07 am

That's smallish chamber...hard to get to fuel mix right in those. That you get 1 in 30 shots tends to point to fuel mix...you're either too rich or too lean...my guess would be rich. Experiment with your fuels.

Maybe consider a 3" chamber instead of 2" if you keep it a spray and pray.
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Unread postAuthor: aaron1023 » Thu Jun 05, 2008 12:08 am

no i drilled a hole and sealed a lanten ignitor( a flint wheel)
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Unread postAuthor: drex » Thu Jun 05, 2008 12:13 am

oh
i thought you ment a lighter that one could use for lighting candles or lanterns.
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Unread postAuthor: aaron1023 » Thu Jun 05, 2008 12:19 am

i've tried crap like blowing in the chamber, only spraying for like a second... i mean what really works
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Unread postAuthor: mega_swordman » Thu Jun 05, 2008 12:19 am

If you are getting the noise but nothing coming out of the barrel, I would assume the problem would be a bad projectile in the barrel since the noise should be some indication that it is still firing and pressure is coming out of the barrel.
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Unread postAuthor: aaron1023 » Thu Jun 05, 2008 12:27 am

it was air tight basicly... is that bad
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Unread postAuthor: drex » Thu Jun 05, 2008 12:34 am

no, as long as it isn't to tight so it could not buge when fired.
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Unread postAuthor: aaron1023 » Thu Jun 05, 2008 12:37 am

i think im just going to make a new gun.... whats an easy gun to build
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Unread postAuthor: starman » Thu Jun 05, 2008 1:13 am

aaron1023 wrote:i think im just going to make a new gun.... whats an easy gun to build


Browse through the cannon showcase....find something you think you can handle and go for it. Do as much on your own as possible, if run up on a snag, ask away.
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Unread postAuthor: Darkside 6ix » Thu Jun 05, 2008 2:00 am

lol, That was an easy gun that you build. Try lubing up the barrel with some jelly, Petroleum jelly that is =]
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Unread postAuthor: Biopyro » Thu Jun 05, 2008 3:59 am

Maybe you'd prefer starting with a ball-valve or unmodded sprinkler pneumatic. They fire every time, and are suprisingly powerful if they are standalone, because it makes it easier to open the ball valve quickly.
There are a lot of simple pneumatics around, amongst all the less simple ones. Have a look at Instructables :)
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