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projectile/ trigger system and chamber all in one.

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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projectile/ trigger system and chamber all in one.

Unread postAuthor: novak » Fri Dec 03, 2010 12:33 am

well i've been trying to think off the most simple way to make the fastest valve. which got me to thinking of just using the projectile as a plug which is locked in by a pin.

by drilling a small hole in the barrel for the pin to go through and lock into the projectile. using o rings wrapped tight to seal the barrel.

pressure loss by a very small hole would be minimal.

this system also could be worked into a cartridge style depending on size. or just a simple single shot pre made device.
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Unread postAuthor: PVC Arsenal 17 » Fri Dec 03, 2010 12:43 am

No reason why it wouldn't work, but I'd consider putting the o-ring after the pin (to prevent tearing them if you intend to reuse these projectiles) and simply seal the pin mechanism.
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Unread postAuthor: novak » Fri Dec 03, 2010 12:45 am

o rings are cheap anyway so im not worried about them. i'll need to make a test gun and see how it all goes first
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Unread postAuthor: ThornsofTime » Fri Dec 03, 2010 12:55 am

Sorry im not an expert linker like Sir.JSR, however, do a quick forums search for "VALVELESS PNEUMATIC". There is a LOT of thought/discussions behind this concept that may be of use to you if you decide to progress with the idea.
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Unread postAuthor: jackssmirkingrevenge » Fri Dec 03, 2010 12:58 am

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Unread postAuthor: novak » Fri Dec 03, 2010 1:07 am

Image

thanks to jsr for this one aswell lol


i'd make it to shot 3/4 projectiles. im in australia so i cant get hold off pellets or anything crazy.
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Unread postAuthor: ThornsofTime » Fri Dec 03, 2010 1:12 am

Yeah, I knew JSR would come save the day. Funny how much stuff you learn by dedicated trolling... and the things you find yourself thinking about on the drive to work... I rarely get punched in before wishing I was back home in the shop....
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Unread postAuthor: jackssmirkingrevenge » Fri Dec 03, 2010 1:32 am

The problem with this sort of system is that you're greatly limited to certain types of projectiles. If you substitute the seal and detent for a burst disk however, you can get practically identical performance and shoot whatever fits in the barrel, something like this.
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Unread postAuthor: POLAND_SPUD » Fri Dec 03, 2010 1:59 am

The problem with this sort of system is that you're greatly limited to certain types of projectiles
let's make it clear that you're not limited to spherical ammo only

What Jsr wanted to say is that you can't shoot sand, water, vegetables and stuff like that... well not unless you sabot them
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Unread postAuthor: jackssmirkingrevenge » Fri Dec 03, 2010 2:06 am

POLAND_SPUD wrote:well not unless you sabot them


Some ideas along those lines in this thread

Image

Image

The concept is sound, but restraining the forces involved requires some pretty substantial construction
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Unread postAuthor: POLAND_SPUD » Fri Dec 03, 2010 2:16 am

The concept is sound, but restraining the forces involved requires some pretty substantial construction
yeah, but the gun can be as loud as a bow... well, at least that's what BTB's experiments suggest
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Unread postAuthor: jackssmirkingrevenge » Fri Dec 03, 2010 2:21 am

double post :?
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Last edited by jackssmirkingrevenge on Fri Dec 03, 2010 4:44 am, edited 1 time in total.
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Unread postAuthor: jackssmirkingrevenge » Fri Dec 03, 2010 3:03 am

POLAND_SPUD wrote:yeah, but the gun can be as loud as a bow...


or quieter ;)

[youtube]http://www.youtube.com/watch?v=dW44MfVDBVc[/youtube]

[youtube]http://www.youtube.com/watch?v=P_N7AZHpTn4[/youtube]

I like psycix's "air bumper" suggestion, it's probably the best way to stop the thing destroying itself:

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Unread postAuthor: novak » Fri Dec 03, 2010 3:23 am

POLAND_SPUD wrote:
The problem with this sort of system is that you're greatly limited to certain types of projectiles
let's make it clear that you're not limited to spherical ammo only

What Jsr wanted to say is that you can't shoot sand, water, vegetables and stuff like that... well not unless you sabot them



im not fussed by that and i dont care how loud it is.

and i want simple. the only hard part is working the trigger into a stock. besides that its pretty much a combustion cannon with a little hole in the barrel. if i can get it to seal it'll work great imo
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Unread postAuthor: jackssmirkingrevenge » Fri Dec 03, 2010 4:32 am

novak wrote:im not fussed by that and i dont care how loud it is.


The point was that to shoot irregular objects, you'd need a sabot, and to avoid making new sabots every time, you might as well catch it, and one of the advantages of doing that is retaining the propellant gas which cuts down on noise.
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