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valveless pellet gun

Built a miniature 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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Unread postAuthor: jackssmirkingrevenge » Thu Jan 03, 2008 3:07 pm

You have a good point, if it had to be built as an auto it would probably fire in bursts as opposed to single shots.
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Re: valveless pellet gun

Unread postAuthor: Antonio » Mon Jan 28, 2008 9:14 am

jackssmirkingrevenge wrote:This is an idea I had a while back.


Hey jack I got this new idea going. It combines ur valveless design with my slidevalve idea. The bb's are pushed past the valve which in your case stops the bb's from flying out and presses in that valve for a burst of air. here is the link:)
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Unread postAuthor: jon_89 » Tue Jan 29, 2008 2:32 am

so if i understand this correctly it is basically a cloud but the bb are just being held until you want to shoot? how long did that 3/4 inch chamber last?
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Unread postAuthor: jackssmirkingrevenge » Tue Jan 29, 2008 2:43 am

The 3/4" chamber was for a high pressure test single shot launcher, while the BBMG was just a concept that I never built.

edit: a more practical incarnation of the idea

Image
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Unread postAuthor: POLAND_SPUD » Mon Jul 19, 2010 5:55 pm

would they be adaptable to the valveless concept as a trigger?
IDK... I'd have to test that but I 6mm bbs are the smallest ammo that I have and I don't think I have any 8X6 fittings ATM

they are useful for all sorts of things... I use them also as an air hose because they are a lot lighter than hydraulic hoses

have a look at some of their function fittings as well -> http://www.cmatic.it/moduli/catalogo/view/serie/MV/0/0
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Unread postAuthor: jackssmirkingrevenge » Mon Jul 19, 2010 5:59 pm

I'm assuing this is what they look like inside:

Image

Doesn't look like it can be readily adapted to hold a projectile in a reliable and airtight manner...
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Unread postAuthor: POLAND_SPUD » Mon Jul 19, 2010 7:40 pm

well you are probably right... though who said you have to use spherical ammo :-D

lol you might as well use sabots

I know I know... I am overusing the word 'lol'...
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Unread postAuthor: jackssmirkingrevenge » Mon Jul 19, 2010 10:23 pm

Ok, lol (lol!) but even assuming you're using sabots, how would you fit it into the design? I'm having a hard time imaginining it lol.
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Unread postAuthor: Lockednloaded » Mon Jul 19, 2010 10:26 pm

you could try to use the male fitting as the sabot, I don't no how you could incorporate that efficiently into a launcher.
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Unread postAuthor: jackssmirkingrevenge » Mon Jul 19, 2010 10:49 pm

Hmm... not very appealing.
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Unread postAuthor: Lockednloaded » Mon Jul 19, 2010 10:56 pm

Pretty is as pretty does despite the fact that that design is pretty awk. If I had some of these fittings I may try it out, but I don't think it is worth ordering some, but then again, I've never understood your love of small caliber or, as I see it, overcomplicated innovation
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Unread postAuthor: jackssmirkingrevenge » Mon Jul 19, 2010 11:01 pm

Lockednloaded wrote:I've never understood your love of small caliber


Urban surroundings, 'nuff said.

overcomplicated innovation


If anything that involved fabrication beyond sticking a couple of store-bought fittings together was "overcomplicated", this would be a rather boring and static hobby.
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Unread postAuthor: Lockednloaded » Mon Jul 19, 2010 11:07 pm

fair enough, to each his own, live and let live, etc..

will you keeping your valve-less attempts single shot at the moment, or will you make the big leap to full/semi auto valve-less?
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Unread postAuthor: jackssmirkingrevenge » Tue Jul 20, 2010 12:54 am

I don't think this particular "detent triggered" design is ideal for full auto, unless you are cycling it externally as I had proposed here.

For full auto, the ideal would be to have a sealed breech that will only release the projectile at a given pressure and reset instantly - something like this with an airtight seal - and the cycle would be as follows:

1 - Air feed valve to projectile chamber opened
2 - Projectile moves to breech and is held by seal
3 - Pressure builds up in the chamber until the projectile is released

The next projectile then moves to the breech and the cycle is repeated until the air feed is closed or projectiles run out.

The only way I see the "detent triggered" design work as semi or full auto is using cartridges, maybe looking like this. The issue is that they're a bit complex to produce in bulk without machining facilities.
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Unread postAuthor: POLAND_SPUD » Tue Jul 20, 2010 4:24 am

well maybe it isn't the best idea but some of their products are just great... if you try those push-to-connect fittings & tubing you won't be using anything else
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