Pneumatic speargun

[twizi]

hey guys i was thinkin about making a pneumatic spear gun i think i am gonna make a 4 foot long coaxil that will be pumped to a certin presure(dont now yet) it will spear will be 4 feet 11 inches it's
presure limit will be 900psi
please add comment any tips or thoughts

[Gun Freak]

Been done... It was a co-ax with a spear and a fishing reel attached to it to real it back, like a harpoon.

[Lockednloaded]

if its going to be shot from above water, i'd go for air, but under water; the hydro/aerodynamics are going to skew preformance

[jor2daje]

If your actually going to use it I would definitely go with mechanical for ease of use.

[twizi]

it would be like btb silent arrow thing with a piston going back and forth so no no air would leabe the barrel during the shot



somthin like this but longer and with a presure washer handle
http://www.spudfiles.com/forums/stainle ... 20802.html


look what i found cuban making homemade pneumatic spearguns from scratch in cuba
http://www.freedivingspearfishing.com/f ... argun.html

[Lentamentalisk]

When faced with a choice, take both. I am making a pneumatic silent "spear" launcher, while my friend is making a mechanical crossbow. They may end up being the subject of our end of year Stat project, measuring accuracy and the likes.

[iknowmy3tables]

well it can be as easy switching up the barrels/chambers on one of your pneumatic spudguns

[jackssmirkingrevenge]

it would be like btb silent arrow thing with a piston going back and forth so no no air would leabe the barrel during the shot

It would be interesting to see that on a large scale, and if you plan on using it underwater limiting the rush of air coming out of the muzzle would be beneficial to your ear drums

[twizi]

i have the chamber and the barrel ready my pilot is good my piston is seting tho si i will give it ome time hopfully will be done this weak

[maxa1]

i am thinking of making a band powered one but not shure yet keep us updated

[twizi]

hey guy tested it the power was very very powerful at 500psi and i wanted to see how much power i can get so i pushed it to a 1000 psi and the captive piston wasent so captive at 1000 psi it fired like a 10x hybrid on steroids so i now am doing somthing a bit easir to relod and perfect for reefs this will take alot of epoxy
i may need your help jack
my idea is based off this http://www.hawaiiansling.net/

[Technician1002]

How deep will it be used? The difference between the air chamber pressure and outside will diminish with depth. For a 100 foot dive in the ocean, the pressure is ( 100 ft / 34 ) x 14.7 = 43.24 psi

At 100 feet, a 100 PSI speargun will have an effective pressure of only 50.86 PSI.

[twizi]

the pneumatic one i made was to big and bulky and powerful for reef diving i am fixing it up for ocean spearfishing this is why i am making this cool hawian sling its made for reef and wreck diving
i will be spear fishing in 30 feet of water or sometimes 60