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valveless gun, update with new videos

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: trollhameran » Wed May 14, 2008 2:06 am

right i understand them alot better now, thanks for explaining.

Hopefully if this valveless idea works it will have the efficiency of a burst disc but without the management and cost issues.
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Unread postAuthor: jackssmirkingrevenge » Wed May 14, 2008 5:33 am

jrrdw wrote:Sgort87 and I was kicking this idea around a little bit. I think you may be the first to build a working model.


*cough COUGH*

:wink:
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Unread postAuthor: SPG » Wed May 14, 2008 10:28 am

jackssmirkingrevenge wrote:*cough COUGH*

:wink:


Say "Ahhhhhhh"

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Unread postAuthor: thewarp16 » Wed May 14, 2008 1:15 pm

did come on msn now i have the best how to video on youtube yet its small loud and might kill us oh and it uses petrol!!!

ohh yeah every one there are videos on youtube of this working if u search velveless or how ever u spell it.

good idea and gun;-)
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Unread postAuthor: Carlman » Wed May 14, 2008 1:18 pm

thewarp16 wrote:did come on msn now i have the best how to video on youtube yet its small loud and might kill us oh and it uses petrol!!!


what? that made no sense
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Unread postAuthor: thewarp16 » Wed May 14, 2008 2:50 pm

sorry i was talking to the maker of this thread lolz we go to the same college
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Unread postAuthor: trollhameran » Wed May 14, 2008 3:39 pm

Jack was the one you made the one that used air rifle pellets? i remember reading about it a few days ago, kinda inspired me to make this one.

lol G u really need to learn to type properly, your post almost makes sense.

Might post my drawings for this gun tomorrow, or i might wait untill ive made the entire gun first
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Unread postAuthor: jackssmirkingrevenge » Thu May 15, 2008 5:06 am

trollhameran wrote:Jack was the one you made the one that used air rifle pellets? i remember reading about it a few days ago, kinda inspired me to make this one.


Yep, all my own work :) The way I see it there are two basic ways of making a valveless launcher, either have a stop that jams the projectile in place until it's ready to fire, like my prototype, or create a configuration where the air pressure exerts no force on the projectile until the latter is moved, as in this patented design:

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The unfortunate dilema with these designs however, aside from sealing issues that are hard to circumvent on an amateur level, is that your choise of projectiles is very limited. I think the best compromise is a burst disk, as it offers similar flow and minimal opening time while letting you launch whatever fits in your barrel.
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Unread postAuthor: trollhameran » Thu May 15, 2008 3:04 pm

That second design is very ingenious, looks like it could work well, ive now made my shotty, and have had it firing, but it needs a proper trigger still and i am going to make a wooden stock for it.

I will post videos once they have uploaded to youtube.

edit: now have videos, these were all at 50psi so maybe tomorrow ill up it to 110 again.

[youtube]http://www.youtube.com/watch?v=8BDCdSDpsko[/youtube]

[youtube]http://www.youtube.com/watch?v=cZNztHqx50g[/youtube]

[youtube]http://www.youtube.com/watch?v=TPUHDtKWGow[/youtube]

[youtube]http://www.youtube.com/watch?v=Zd4RHJgMVe8[/youtube]
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Unread postAuthor: thewarp16 » Thu May 15, 2008 3:48 pm

is this the thread you were talking about or is there a nother one some were and there is nuffin wrong with the way i type lol.

mmmm "soda"
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Unread postAuthor: trollhameran » Thu May 15, 2008 3:55 pm

yh its this one, lol that post was quite good typing actually
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Unread postAuthor: jrrdw » Thu May 15, 2008 9:00 pm

Sorry Jack, you gotta point these things out to me from time to time! Now I feel bad.... :(
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When life gives you lemons...throw them back they suck!
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Unread postAuthor: trollhameran » Fri May 16, 2008 1:44 am

now working on a shell made out of a board marker lid and another rubber seal, had first test with it this morning, think i need to finish the trigger before i test again though
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Unread postAuthor: trollhameran » Sat May 17, 2008 11:17 am

ok the casing from a board marker makes an excellent shell, it seals at 110psi and can fit alot of bbs or anything else you may want to fire in it, just tested it and the casing hit the wall and shattered into about 20 pieces and scattered about 30 feet aways from the wall it hit, so now im on a search for more board markers
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Unread postAuthor: thewarp16 » Sat May 17, 2008 11:22 am

lmfao now im on the hunt for more board markers.

yea im gluing up the chamber and u bend of my shotty now lol
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