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submersable speargun

Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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Unread postAuthor: benstern » Thu Jul 19, 2007 6:58 pm

Just make a spring loaded harpoon. It would be just as easy and more fun due to the ability to reload underwater. I am gonna make a graphic showing how to build one.

EDIT: image

Image

Some spear guns use elastic bands. So just use latex tubing to launch something instead of a spring.
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Unread postAuthor: homedepotpro » Thu Jul 19, 2007 9:48 pm

big-mac: im going with this ammo because of its weight and lack of too much friction/resistance

benstern: this is the gun, it is pneumatic. i looked into latex tubing gun idea and i thought this would be more fun to build and have more than one use.
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Unread postAuthor: Big-mac » Thu Jul 19, 2007 11:05 pm

still you could use a small diameter steel rod...for strength and what not.
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Unread postAuthor: homedepotpro » Thu Jul 19, 2007 11:18 pm

i actually did
Image
it is considerably heavier though, and shoots at lower velocities but with much more impact force
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Unread postAuthor: paaiyan » Thu Jul 19, 2007 11:23 pm

I see you did decide to put a bit of a bevel on that tail there. What'd you use, epoxy?
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Unread postAuthor: Big-mac » Thu Jul 19, 2007 11:27 pm

wouldnt it be better for under water. it could shoot farther. more weight u know
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Unread postAuthor: homedepotpro » Thu Jul 19, 2007 11:29 pm

yeah i know it need more weight so i pick the rod up at home depot. oh the bevel is just hot glue, do you think it needs to be epoxy?
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Unread postAuthor: Big-mac » Thu Jul 19, 2007 11:34 pm

how do you load it with the wire tethering it? ps this is cool i didnt mention before
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Unread postAuthor: homedepotpro » Thu Jul 19, 2007 11:47 pm

unscrew the barrel and breach load it, the string is coiled in the breach and pulled out with the spear.
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Unread postAuthor: spud yeti » Fri Jul 20, 2007 10:55 am

its a really cool idea, but how well does it actually work? You should shoot it under water and the air released would look like an uber fart :D
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really good quote/phrase here
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Unread postAuthor: homedepotpro » Fri Jul 20, 2007 11:02 am

spud yeti wrote:its a really cool idea, but how well does it actually work? You should shoot it under water and the air released would look like an uber fart :D

yeah, i know, but i did the math and there is only going to be like a liter and a half of air being released, so it shouldn't be too huge.
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Unread postAuthor: blue2583 » Fri Jul 20, 2007 11:16 am

good idea i think itll work. :lol: :lol: :lol: :lol: :lol:
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Unread postAuthor: jackssmirkingrevenge » Fri Jul 20, 2007 1:53 pm

Pneumatic spearguns are nothing new, the physics has alread been covered :) Nice effort HDP, though may I suggest a larger chamber (as well as some deft use of the "crop" funtion of your chosen image editing program for the fourth pic :P )
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Unread postAuthor: iknowmy3tables » Sat Aug 04, 2007 4:07 pm

could you please show me wher you put the schrader cause it looks like its in the center from this angle and that would be on the output side

I'm trying tomake a flexible chamber barrel portable gun
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Unread postAuthor: ProfessorAmadeus » Sat Aug 04, 2007 4:29 pm

So say you take this under water to a consiterable depth like 30 feet. The air pressure will lose a fraction of its power and therefore need more air for the same amount of power it has at the surface. Now I am just guessing that this chamber will act the same as scuba equipment but I may be wrong.

Also if you are into scuba they make adapters that you can attach to your first stage regulator that is like a bike pump adapter for a compressor. I think they are only like 50 bucks. Then you can reload under water.
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