Homemade Handheld CLGG Diagram (THEORY) Basically an untested electrically ignited single shot firearm using methane oxygen mix as propellant (or you could try substituting methane with other flammable gasses such as propane or hydrogen) inside a capsule to propel a projectile (steel ball bearing/s). This is done as opposed to gunpowder which is heavily regulated or banned in many countries. This is only a theoretical design but it gives you an idea on how to get around the acquiring primers/gunpowder issue. Although oxygen and methane has a much lower energy density than modern gunpowder or even black powder, with enough gas mixture and a solid means to contain and direct it, it is theoretically possible to make firearm projectile propellant from methane and oxygen, as once ignited the pressure spikes and pushes the projectile down the only way it can go (the barrel) at higher speeds. Pure methane gas can be bought for camping in canisters, or can be siphoned off from gas from an oven for example. Oxygen is more difficult to get pure in canisters unless you have a specific medical condition, but you can get some plants that create small bubbles of it over time that can be collected in an upside-down test tube or plastic measuring cylinder inside a larger container filled with water. Allow the bubbles to accumulate then disturb them by shaking the plant leaf and bending it so the bubbles rise in the water to go into a funnel that goes into an upside down measuring cylinder or test tube. Then once enough is collected, bung or seal it to then use the same method to fill up a capsule for a methane (or other gas such as hydrogen or propane) and oxygen mix.
>>65120085Why would you go through the hassle of making "cartridges" like that when it is so easy to use pressurized tanks of gas from a small torch rig?> Oxygen is more difficult to get pure in canistersNo, it's not, it's widely sold for torches, you can get small canisters at a hardware store, large ones at any welding supplier.
>>65120085It's just going to make a nice pop, since your propellant gases are at basically atmospheric pressure. I doubt you'll see significant velocity produced.
>>65120093You would make the "cartridges" to fit the barrel or visa versa and I mean oxygen tanks are harder to get than methane gas tanks, but as you explained not that hard as you can get it from hardware stores which is a good tip, i didn't think of that.>>65120172I wrote in the image (because the message board doesn't allow the whole thing due to character limits) that you can make the capsule (or "cartridge") longer and thus increasing power the longer it gets, however the barrel and frame would have to withstand the pressure so it would need to be thicker or a tougher metal which could be harder to work with. An other tips or ideas for improvement would be appreciated.
You can also narrow the barrel and projectile to increase pressure as well as lengthen the cartridge and so increase the amount of oxygen methane mix and so the total energy expended and so the velocity of the projectile. Either of these and especially both will increase pressure and velocity. It is nowhere near as efficient as modern gunpowder or black powder, but oxygen and methane (or any other flammable gas) in a large enough amount can still propel projectiles in a contained space, it's a matter of building and testing these things.
>>65120085Why go through all this trouble to use a propellant inferior to black powder? Why not just make black powder? >it's controlledEven if it's controlled in the Lower Barony of Buttfuckistan, the ingredients are not. The instructions are not. A bunch of toothless malnourished faggots could do this 800 years ago with tainted ingredients and an imprecise (to be kind) understanding of the ratios involved and what was actually happening. They got it done anyway. What's your excuse?Seriously, it's easier than whatever the fuck this is supposed to be.
Assuming a 30mm long chamber with a 10mm bore, you will have approximately 0.85 milligrams of methane, with about 42 joules of chemical potential energy. Assuming perfect combustion and perfect energy transfer, you could theoretically make a gun with power about halfway between a .22 bb and a .22 short subsonic.
>>65120085I think you've got the 'tism anon. Kinda interesting though.
>>65120236You're still at atmospheric pressure.If you're working with an open topped water cylinder, and then displacing the water from your "cartridge" with the resultant gases, the most you'll get is whatever the ambient air pressure is.You'll never realize the energy density you're looking for with your gases at ambient.
So I did some research and if you get canister of 600ml which measures internally roughly 50mm for the diameter and 300mm in length as an example, and fill it with a mix of 2:1 oxygen to methane it will produce over 100 joules of energy, enough to propel a .22 projectile at over .22 short speeds, almost at .22 long rifle speeds. This is assuming a 2% energy transfer efficiency. It is not that convenient of a weapon compared to gunpowder propelled firearms, but it proves you can use alternative propellants and still make something viable as a firearm for those who may be difficult or suspicious to acquire gunpowder, or the ingredients to make gunpowder. These are just ideas.
>>65123158That's almost exactly 26 times the volume of a .50 BMG cartridge. Should be pretty close to 40mm Bofors.
