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No-seal pneumatic cartridge.

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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No-seal pneumatic cartridge.

Unread postAuthor: fractal » Fri Nov 07, 2014 4:34 pm

Image

-RED: Seal

-GREEN: Firing pin

-BLACK: Projectile


The bullet seals the barrel. Air can't get behind the bullet and push it down the barrel. When something hits the firing pin it moves the bullet a little bit forward, but enough to the pressurized air get behind the bullet and shoot. :bounce:
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Re: No-seal pneumatic cartridge.

Unread postAuthor: mobile chernobyl » Fri Nov 07, 2014 4:51 pm

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Re: No-seal pneumatic cartridge.

Unread postAuthor: Technician1002 » Sat Nov 08, 2014 6:02 pm

The design works well but manufacturing the projectiles takes lots of effort for single use. An alternate design shoots a similar designed valve core to the rear for re-use, while permitting much larger selection of projectiles. Look in my sig for examples.
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Re: No-seal pneumatic cartridge.

Unread postAuthor: Gleedaniel13 » Tue Nov 18, 2014 8:50 am

If the the effort can lead to good results then why not try? :wink:
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Re: No-seal pneumatic cartridge.

Unread postAuthor: mobile chernobyl » Tue Nov 18, 2014 4:13 pm

The design certainly has it's benefits - one of the most notable will be consistency.

A professor was leading a project for Engineering seniors in my school - and I asked them why they picked a similar design for testing - repeatability was their claim. They were designing a kinetic energy delivery system to imitate concrete debris being blasted from a wall at a soldier behind it - the end product being used for the testing and qualification of body armor.

It makes sense - given that the projectiles mass can be fine tuned easily - and the seals will always be in the same condition: "new". Therefore, give chamber pressure and temperature you should be able to depend upon a consistent muzzle energy.
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Re: No-seal pneumatic cartridge.

Unread postAuthor: jackssmirkingrevenge » Sat Dec 20, 2014 10:03 pm

Typically, someone already patented it: spud-cannon-related/topic12569.html?hilit=valveless#p146694
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