Login    Register
User Information
Username:
Password:
We are a free and open
community, all are welcome.
Click here to Register
Sponsored
Who is online

In total there are 63 users online :: 3 registered, 0 hidden and 60 guests


Most users ever online was 155 on Mon Aug 15, 2016 1:40 am

Registered users: Bing [Bot], Google [Bot], Yahoo [Bot] based on users active over the past 5 minutes

The Team
Administrators
Global Moderators
global_moderators.png CS

Pneumatic speargun

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
Sponsored 

should i build a pneumatic or mechanical spear gun

pneumatic
7
58%
mechanical
5
42%
 
Total votes : 12
  • Author
    Message

Pneumatic speargun

Unread postAuthor: twizi » Mon Apr 19, 2010 6:21 pm

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
  • 0

dont play with airsofter with 1000$ gun and play with a 5 dollar pair of glasses
User avatar
twizi
Colonel
Colonel
 
Posts: 511
Joined: Thu Nov 27, 2008 9:04 pm
Location: up yours
Reputation: 0

Unread postAuthor: Gun Freak » Mon Apr 19, 2010 6:27 pm

Been done... It was a co-ax with a spear and a fishing reel attached to it to real it back, like a harpoon.
  • 0

OG Anti-Hybrid
One man's trash is a true Spudder's treasure!
Golf Ball Cannon "Superna"M16 BBMGPengunHammer Valve Airsoft SniperHigh Pressure .22 Coax
Holy Shat!
User avatar
Gun Freak
Lieutenant General
Lieutenant General
 
Posts: 4969
Joined: Mon Jan 25, 2010 4:38 pm
Location: Florida
Country: United States (us)
Reputation: 11

Unread postAuthor: Lockednloaded » Mon Apr 19, 2010 6:36 pm

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
  • 0

I love lamp
User avatar
Lockednloaded
Major General
Major General
 
Posts: 1558
Joined: Thu Sep 03, 2009 9:38 pm
Location: Texas, USA
Reputation: 0

Unread postAuthor: jor2daje » Mon Apr 19, 2010 6:59 pm

If your actually going to use it I would definitely go with mechanical for ease of use.
  • 0

Patience is a virtue, get it if you can, seldom in a women, never in a man.
User avatar
jor2daje
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 418
Joined: Sun Oct 05, 2008 9:41 pm
Location: Southern California
Reputation: 0

Unread postAuthor: twizi » Mon Apr 19, 2010 7:02 pm

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/stainless-steel-coaxial-pistol-t20802.html


look what i found cuban making homemade pneumatic spearguns from scratch in cuba
http://www.freedivingspearfishing.com/forum/spearguns/153-homemade-pneumatic-speargun.html
  • 0

Last edited by twizi on Mon Apr 19, 2010 7:57 pm, edited 1 time in total.
dont play with airsofter with 1000$ gun and play with a 5 dollar pair of glasses
User avatar
twizi
Colonel
Colonel
 
Posts: 511
Joined: Thu Nov 27, 2008 9:04 pm
Location: up yours
Reputation: 0

Unread postAuthor: Lentamentalisk » Mon Apr 19, 2010 7:55 pm

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.
  • 0

Do not look back, and grieve over the past, for it is gone;
Do not be troubled about the future, for it has not yet come;
Live life in the present, and make it so beautiful that it will be worth remembering.
User avatar
Lentamentalisk
Brigadier General
Brigadier General
 
Posts: 1202
Joined: Tue Aug 07, 2007 5:27 pm
Location: Berkeley C.A.
Reputation: 0

Unread postAuthor: iknowmy3tables » Tue Apr 20, 2010 11:20 am

well it can be as easy switching up the barrels/chambers on one of your pneumatic spudguns
Image
  • 0


iknowmy3tables
Major General
Major General
 
Posts: 1558
Joined: Fri Dec 15, 2006 3:57 pm
Location: maryland
Country: United States (us)
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: jackssmirkingrevenge » Tue Apr 20, 2010 1:17 pm

twizi wrote: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 ;)
  • 0

User avatar
jackssmirkingrevenge
Donating Member
Donating Member
 
Posts: 24225
Joined: Thu Mar 15, 2007 11:28 pm
Country: Holy See (Vatican City State) (va)
Reputation: 66

Unread postAuthor: twizi » Tue Apr 20, 2010 4:04 pm

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
  • 0

dont play with airsofter with 1000$ gun and play with a 5 dollar pair of glasses
User avatar
twizi
Colonel
Colonel
 
Posts: 511
Joined: Thu Nov 27, 2008 9:04 pm
Location: up yours
Reputation: 0

Unread postAuthor: maxa1 » Tue Apr 20, 2010 4:14 pm

i am thinking of making a band powered one but not shure yet keep us updated
  • 0


maxa1
Private First Class
Private First Class
 
Posts: 29
Joined: Mon Apr 19, 2010 5:12 pm
Reputation: 0

Unread postAuthor: twizi » Wed Apr 28, 2010 7:46 pm

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/
  • 0

dont play with airsofter with 1000$ gun and play with a 5 dollar pair of glasses
User avatar
twizi
Colonel
Colonel
 
Posts: 511
Joined: Thu Nov 27, 2008 9:04 pm
Location: up yours
Reputation: 0

Unread postAuthor: Technician1002 » Wed Apr 28, 2010 8:10 pm

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.
  • 0

User avatar
Technician1002
Chief of Staff
Chief of Staff
 
Posts: 5190
Joined: Sat Apr 04, 2009 11:10 am
Reputation: 14

Unread postAuthor: twizi » Wed Apr 28, 2010 8:17 pm

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
  • 0

dont play with airsofter with 1000$ gun and play with a 5 dollar pair of glasses
User avatar
twizi
Colonel
Colonel
 
Posts: 511
Joined: Thu Nov 27, 2008 9:04 pm
Location: up yours
Reputation: 0

Return to Pneumatic Cannon Discussion

Who is online

Registered users: Bing [Bot], Google [Bot], Yahoo [Bot]

Reputation System ©'