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Brass 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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Re: Brass Harpoon Gun

Unread postAuthor: jackssmirkingrevenge » Wed Apr 14, 2010 11:57 pm

ONEWING wrote:in fact it would have been posted on the old old spudtech forum 9 years ago.


I think I have a diagram of it archived somewhere, I'll look it up when I get home :)
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Unread postAuthor: chinnerz » Thu Apr 15, 2010 12:22 am

ONEWING wrote:I dont know what KLM is so I'm assuming its "pipe".

Suprisingly after sitting outside under a walnut tree for many years the old girl fired up just fine today, after a few bursts of dirty water and dead spiders its good to go.


im no expert here (trust me i have never EVER worked with copper before) but i think k, L and M are different types grades of copper, each with different properties (the most important is ability to withstand pressure )

correct me if i am wrong
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Re: Brass Harpoon Gun

Unread postAuthor: ONEWING » Thu Apr 15, 2010 3:31 am

jackssmirkingrevenge wrote:
ONEWING wrote:in fact it would have been posted on the old old spudtech forum 9 years ago.


I think I have a diagram of it archived somewhere, I'll look it up when I get home :)


True there was one I drew in paint both side and top view, and also an animated gif explaining the operation of the piston valve. The gif got spread about a lot but it be common knowledge now. Couple other pics that were posted and lost were a side view and another on the rover, quality was pretty crap though as cheap camera quality wasn't as good back then!

Anyways seeing as how it actually still works I'll see what some brasso can do. Serious rust in the blowgun seems to be the only real issue.
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Unread postAuthor: ONEWING » Thu Apr 15, 2010 11:31 pm

I tried to get a movie today but this is the result, camera is very old with a tape thats been recorded over many times so quality is amiss. I could only find 1 empty shell so I thought if I started at 20psi I could get more then one shot, but alas I lost it. It was just an empty case no modifications at 20psi. Sound didn't come out so well you may have to turn your speakers up.


http://www.youtube.com/watch?v=s-eu2PIxrpk

ps. How do you embed youtube vids? copying and pasting the code doesn't work.
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Unread postAuthor: jackssmirkingrevenge » Thu Apr 15, 2010 11:45 pm

ONEWING wrote:How do you embed youtube vids? copying and pasting the code doesn't work.


[youtube]http://www.youtube.com/watch?v=s-eu2PIxrpk[/youtube]

Paste the URL, highlight it and click on the "youtube" button top right over the message field, or simply (youtube)http://www.youtube.com/watch?v=s-eu2PIxrpk(/youtube) replacing ( and ) with [ and ]

btw, look what I dug up :)
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Attachments
pneumatic harpoon launcher mechanism.gif
pneumatic harpoon launcher piston.jpeg
pneumatic harpoon launcher piston.jpeg (20.02 KiB) Viewed 1819 times
pneumatic harpoon launcher 2 view.jpeg
pneumatic harpoon launcher 2 view.jpeg (29.04 KiB) Viewed 1819 times
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Unread postAuthor: ONEWING » Fri Apr 16, 2010 12:08 am

Ahhh thanks Jack they are the ones. I don't remember drawing that first one but I no doubt did, didn't think I put an O-ring in the piston maybe I drew that as an ideal picture rather then what I did but then how did I know 2" Cu fit into the bush reducer... I'll have to screw it open to find out whats inside there. But then the looser tolerances may be the reason it still works full of mud and spiderwebs.
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Unread postAuthor: jackssmirkingrevenge » Fri Apr 16, 2010 10:30 am

ONEWING wrote:But then the looser tolerances may be the reason it still works full of mud and spiderwebs.


That's why the AK is still largely responsible for third world population control :roll: :D
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Unread postAuthor: ONEWING » Sat Apr 17, 2010 1:13 am

I have some primed cases here so I shot one around until it went off, average fps is in the 290's @ 20psi with an unmodded case and just over 600fps @ 100psi.

Knocking the primer out and replacing it with a nail gave around 400fps at 100psi, chrony result is below.

Thats my niece below, she attempts to pump it up then runs around and cries when she cant pull the trigger.
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shotshelldart.jpg
Shotshell + nail at 100psi
startedsomething.jpg
Started something!
Last edited by ONEWING on Sat Apr 17, 2010 5:31 am, edited 1 time in total.

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Unread postAuthor: jackssmirkingrevenge » Sat Apr 17, 2010 2:07 am

ONEWING wrote:Thats my niece below, she attempts to pump it up then runs around and crys when she cant pull the trigger.


girls eh :roll:

Fantastic results, it's really good to see that one of the launchers which inspired me in my youth (I had saved the diagrams in 2003!) is still up for it :D
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Unread postAuthor: ONEWING » Wed May 05, 2010 5:07 am

Found a couple more pics on an old hard drive. And another little arrow firing piston gun, the flights slide to the back when fired, it was crap.
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01.jpg
Harpoon gun side
01.jpg (35.5 KiB) Viewed 1664 times
05.jpg
On landrover 2
01.jpg
brass arrow pistol
01.jpg (6.46 KiB) Viewed 1664 times
02.jpg
exploded parts
02.jpg (36.11 KiB) Viewed 1664 times

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Unread postAuthor: theBOOM » Wed May 05, 2010 5:18 am

Wow that brass arrow pistol looks deadly man!

Good job building these, they looked in really good shape back then, why not sand them a bit and polish them up to recover that awesome shine? :P

Edit, Love the JEEEP :D :D
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Unread postAuthor: jackssmirkingrevenge » Wed May 05, 2010 7:59 am

ONEWING wrote:And another little arrow firing piston gun, the flights slide to the back when fired, it was crap.


lol I have those saved too! good stuff :)

Love the JEEEP


ImageImage

:P
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