Show us your pneumatic spud gun! Discuss pneumatic (compressed gas) powered potato guns and related accessories. Valve types, actuation, pipe, materials, fittings, compressors, safety, gas choices, and more.
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fractal
- Private
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- Joined: Wed Mar 05, 2014 10:14 am
Fri Nov 07, 2014 4:34 pm
-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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Technician1002
- Captain
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- Joined: Sat Apr 04, 2009 11:10 am
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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mobile chernobyl
- Corporal 3
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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.
