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cartridge?

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cartridge?

Unread postAuthor: dragon finder » Sun Oct 08, 2006 7:12 pm

could it be possible to have a cartridge with both the fuel and ammo?

using a precussion cap as the ignition? or a contact ignition?

i was thinking of how big it would have to be and what type of fuel. like should one use butane, propane, lighter fluid, hydrogen, or other fuels.
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Unread postAuthor: jrrdw » Sun Oct 08, 2006 7:34 pm

When i seen the title, about a gazillion thoughts went through my mind. Then as i thought about it some more, that gazillion shrank to dhaaaaa! I think you would have to design the most of it around the loading mechanizum.

How about pieces of pcv with metal inserts in 1 end to hold sparker/precusen caps, fill with fuel, shove ammo in, theres your preloaded cartridge.

Tennis ball preloads sound easy.
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Unread postAuthor: FreakyShotGlass » Sun Oct 08, 2006 8:24 pm

I thought of exactly that and made a flash animation.
Image
It would be an easy way to get either semi or magazine loaded bolt-action.
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Unread postAuthor: Atlantis » Sun Oct 08, 2006 8:46 pm

I've seen a useful design on SpudTech, the only difference was that the bolt had 2 circles on it, one inside the other, they matched up with 2 points on the cartridge, that way, no matter how much the cartridge spun it would always touch the 2 circles.
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Unread postAuthor: FreakyShotGlass » Sun Oct 08, 2006 8:48 pm

Concentric electrodes is a good idea, has anyone ever actually made a working cannon with this design, I think i will try to produce a bolt-action using pre-loaded marble shells.
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Unread postAuthor: Atlantis » Sun Oct 08, 2006 8:56 pm

Somebody made a prototype. I'll try to find it tomorrow. I believe the topic title was Cartridge Combustion or something on SpudTech.
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Unread postAuthor: Pete Zaria » Sun Oct 08, 2006 11:36 pm

The problem with this is that the amount of power you can produce with a fuel/air mixture AT ATMOSPHERIC PRESSURE is limited directly by the volume of the combustion chamber. In this example, the combustion chamber (inside the "shell") is pretty small. Without pressurizing the gas/air mixture, you can't get much power out of it. Pressurizing the gas/air mixture makes your gun technically a hybrid, which presents some design challenges. The first one is how you'd keep the pressurized gas inside the "shell" after you've disconnected your source. Maybe you could make reusable metal shells with a shrader to fill them with.

The easy solution would be to make each "shell" long, but reasonably thin (with a small-ish projectile, like a marble). This provides a fair amount of fuel/air behind a projectile, given the size of it, which could produce more power (by ratio).

I like the concept. Let me know what you come up with.

Peace,
Pete Zaria.
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Unread postAuthor: BC Pneumatics » Mon Oct 09, 2006 12:14 am

illegal, and it has been done...
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Unread postAuthor: frankrede » Mon Oct 09, 2006 1:20 am

Yes, prefilled cartridges are illegal but really, I would still do it;)
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