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Harpoon gun

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: brplatz » Mon Sep 22, 2008 7:01 pm

We took compound bows fishing about 2 weeks ago (mind you were shooting carp) and the game warden looked at us, laughed and walked on by. Ive even heard they will pay you to take out the carp :D

I don't think i will have a legality problem.
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Last edited by brplatz on Mon Sep 22, 2008 10:20 pm, edited 1 time in total.
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Unread postAuthor: frankrede » Mon Sep 22, 2008 7:45 pm

I would ask first if I were you.
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Unread postAuthor: brplatz » Mon Sep 22, 2008 9:19 pm

I do believe I will. But for some reason I don't think carp are even considered "game".
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Unread postAuthor: biggsauce » Mon Sep 22, 2008 11:12 pm

Gamefish or not, down here using a mechanically operated spear (bows with appropriately tipped arrows don't count) from a boat or land to take ANY fish is illegal. Bowfishing (very popular down here) and spearfishing while skindiving (not so popular, clear water is hard to find locally) is legal(for certain kinds of fish in certain areas). The laws may be different where you are, but I doubt it. Game wardens don't mess around.

That being said, thats a solid cannon you got there. Any plans for CO2?
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Unread postAuthor: brplatz » Mon Sep 22, 2008 11:22 pm

I will have to be careful then. My friend got me some 65lb fishing line for it but I'm not sure what tension rating is necessary. Possibly a modified arrow as a projectile might be more acceptable?

Anyway, I plan to use either a bunch of 12g C02 i have around(just need the adapter) or my friend has a Scuba and HPA tanks for Paintball i could reg down.

Thanks for the kind words of advice :D
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Unread postAuthor: biggsauce » Mon Sep 22, 2008 11:28 pm

I modified a bowfishing arrow by jb welding on a sort of permanent sabot that fit my barrel, it worked like a charm. As for the line, proline 100lb test, if I remember correctly. Donkey strong and pretty light.
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Unread postAuthor: lambey108 » Tue Sep 23, 2008 3:58 am

how much psi do u shoot it at and dose the line come out smoothly
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Unread postAuthor: brplatz » Tue Sep 23, 2008 7:58 am

I really need to design a better harpoon but right now it shoots and goes sideways and such. Usually shot at about 120PSI and line comes out perfectly! :D
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Unread postAuthor: lambey108 » Wed Sep 24, 2008 5:03 am

nice thankxs

have u used this underwater
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Unread postAuthor: brplatz » Wed Sep 24, 2008 8:09 am

no but i plan to shoot into water. there is some crazy friction thing if you fire a projectile in a sealed air "barrel" then it breaks into the water.
I believe that is why real harpoon guns use elastics.
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Unread postAuthor: Drop that Sound » Thu Sep 25, 2008 3:41 am

Just wondering the size and type of the fitting in the extinguisher you used.. I got the same tank ..
-Drop
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Unread postAuthor: brplatz » Thu Sep 25, 2008 1:23 pm

its 3/4 to 1/2 bushing with plenty of JB Weld
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