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Reinventing the underwater gun

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.
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Unread postAuthor: iknowmy3tables » Wed Mar 05, 2008 11:13 pm

sjog wrote:Early spear guns were powered w/co2
small diameter barrel to fit spear snug
one spear w/line and barb then 'drivers' shot after that to subdue large fish
Hans Hass was the guy who wrote book.I read it in many years ago.

there still are CO2 spear guns I've heard that their awesome
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Unread postAuthor: Jared Haehnel » Thu Mar 06, 2008 7:11 am

you've got it backwards


Oops... :oops:
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Unread postAuthor: Shango » Sat Mar 08, 2008 4:23 pm

FYI, pressure increases by One Atmosphere for every 33 feet of seawater (FSW). so, at the surface you have one atmosphere, in 33 FSW you have two atmospheres, in 66 FSW three atmospheres etc..
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Unread postAuthor: jackssmirkingrevenge » Mon Mar 10, 2008 2:38 am

I just had to throw this vid in:

[youtube]http://www.youtube.com/watch?v=x-P578pnctU&feature=related[/youtube]

:D
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Unread postAuthor: Shango » Mon Mar 10, 2008 6:12 am

Wow! Does James Bond know of this?
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Unread postAuthor: Jared Haehnel » Mon Mar 10, 2008 8:23 am

The navy SEALs use a similar gun....

8) I love cool guns....
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Unread postAuthor: LikimysCrotchus5 » Mon Mar 10, 2008 2:08 pm

I only can understand so many words.

I understood some of it becuase some of the words are the same as in Ukrainian.

I did get the names though :D

But anyway, its a very nice gun.
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Unread postAuthor: jackssmirkingrevenge » Mon Mar 10, 2008 8:28 pm

Jared Haehnel wrote:The navy SEALs use a similar gun...


This one :)
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Unread postAuthor: DYI » Mon Mar 10, 2008 8:35 pm

That's some of the most vicious looking ammunition I've ever seen. I do know how they work and all, I'd just never actually seen a picture of them before. There's just something mildly amusing about seeing someone load large metal darts into a rifle clip :D
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Unread postAuthor: jackssmirkingrevenge » Mon Mar 10, 2008 8:41 pm

DYI wrote:That's some of the most vicious looking ammunition I've ever seen.


Rifling the projectile is useless when firing through such a dense medium as water, hence the need for long drag stabilised projectiles.
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Unread postAuthor: Jared Haehnel » Tue Mar 11, 2008 7:42 am

I once read an article about these guns and some thing about the fact the object is long and straight and moving at the high speed, helps to keep the projectile on course. But Jack' explanation sounds better...

Kind of sucks that it is factory reloaded...
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