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piston question

A place to ask general spud cannon related questions.
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Unread postAuthor: spudy buddy » Thu Jan 10, 2008 11:40 pm

kk thats what i thought but i wasn't sure how long i would have to make it (the chamber) for it to work good. i still want it to be a 1 handed wepon so i can pump it with the other hand. anyone got a clue?
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Unread postAuthor: Isomer » Thu Jan 10, 2008 11:43 pm

It's pretty much just the longer=better for a chamber, just remember to keep your C:B ratio in check when calculating. Also, the same goes for a barrel but only to a certain extent, at a certain point (assuming a fixed chamber volume) there are no advantages to increasing the the length of the barrel. So my advice; just cut your chamber to a size you feel comfortable holding and cut the barrel to fit.
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Unread postAuthor: spudy buddy » Thu Jan 10, 2008 11:51 pm

ya thats what i was planing but since the barrel is such a small diameter would i have to make it stick out more than 1 or 2 inhes out of the chamber???

Edit: and will the mini bike pump be able to get it to 50 psi???

Edit: also it's not posible to make a mag for a co-axial right?
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Last edited by spudy buddy on Thu Jan 10, 2008 11:54 pm, edited 1 time in total.
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Unread postAuthor: Isomer » Thu Jan 10, 2008 11:52 pm

Not that i am aware of...there have been coaxials that have virtually nothing sticking out of the chamber and others that have more than 2 feet

EDIT: the C:B ratio is a bit flexible so, you could make it fit with quite a large tolerance~5in maybe? not sure
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Unread postAuthor: Ragnarok » Thu Jan 10, 2008 11:54 pm

spudy buddy wrote:i still want it to be a 1 handed wepon so i can pump it with the other hand.

A word of advice. Don't ever call any spudgun a weapon - that gets you into big legal messes. Weapon suggests it is intended for causing injury to people or animals, and it's not a good habit to be in to link a recreational item with such things.
I prefer to not even call it a gun (also big legal messes in the UK), sticking to launcher, cannon or spudgun.

Depending on where you are, "gun" might be fine, but anywhere in the world calling it a "weapon" is asking for trouble.
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Unread postAuthor: spudy buddy » Thu Jan 10, 2008 11:55 pm

kk i don't plan on having more than 1 or 2 inches sticking out
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Unread postAuthor: Isomer » Thu Jan 10, 2008 11:57 pm

Ragnarok wrote:
spudy buddy wrote:i still want it to be a 1 handed wepon so i can pump it with the other hand.

A word of advice. Don't ever call any spudgun a weapon - that gets you into big legal messes. Weapon suggests it is intended for causing injury to people or animals, and it's not a good habit to be in to link a recreational item with such things.
I prefer to not even call it a gun (also big legal messes in the UK), sticking to launcher, cannon or spudgun.

Depending on where you are, "gun" might be fine, but anywhere in the world calling it a "weapon" is asking for trouble.


For some reason the word 'gun' scares me more than weapon...at least i have a chance of it being a knife or something right?
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Unread postAuthor: jackssmirkingrevenge » Fri Jan 11, 2008 12:00 am

Just call it a "launcher"

What defines an object as a weapon is not its characteristics but the manner in which it is used - a pencil or bicycle chain for example aren't objects that you would normally call "weapons", unless they are used to attack someone.
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Unread postAuthor: spudy buddy » Fri Jan 11, 2008 5:30 pm

WOW sry i wasn't aware that i called it a weapon. :shock: i simply ment an airsoft bb propeling device, hows that? back to the bb propeling device will a mini bike pump work for presurizing it?
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Unread postAuthor: MrCrowley » Fri Jan 11, 2008 5:54 pm

Launcher or cannon will do.

With a piston that small, probably, you might have to do some rapid pumping at the start to get it to seal though.
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Unread postAuthor: spudy buddy » Fri Jan 11, 2008 6:31 pm

ok but the pump can pump it tp around 50 psi and won't juat start leaking or something right. wow a 1 inch piston is small? how big of a piston do you make??? also are there tees for brake line cause i was think about this before i fell asleep last night.
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Unread postAuthor: MrCrowley » Fri Jan 11, 2008 6:35 pm

Yeah it'll get to 50psi. A $10 one from walmart can do 120psi.

Biggest i've made, 2", biggest i've worked on 3". It broke and needs to be fixed.

Not sure about the tee.
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Unread postAuthor: spudy buddy » Fri Jan 11, 2008 6:37 pm

ok it was just an idea. most people somehow keep the bbs from falling out of the barrel anyone know how?
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Unread postAuthor: pvcmaster » Fri Jan 11, 2008 6:49 pm

The original topic of this post was sealing faces, so I thought I would slip in a question. My piston has a diameter of 2" and it is sealing against a piece of 1.5" pipe. Is the difference between the O.D. of 1.5" (Which is 1.900") and the piston enough to open the valve?
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Unread postAuthor: spudy buddy » Fri Jan 11, 2008 6:55 pm

well i don't know, seeing that am asking most of the questions, but it probably is. one of the experts will answer you for sure
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