9 replies to this topic

[Jaffe]

After reading The page of the XCC I wanna try to make my own combustion riffle. F.R.O.F.C.R. stands for Fast Rate Of Fire Combustion Rifle , the most important gole of this project is to reach a high rate of fire. Further I'm trying to make a gun that is very comfortable is your hands and when your aiming.
The plan is to make a chamber from 50MM PVC(grey) I dont now how long it's going to be, the barrel wil be made out of 3/4" PVC(grey). Boltsniper used a presurised tank for the fuel, I will just use a butane lighter for the fuel. Incase of having a pump on the rifle i will use a tank with air to vent the chamber.
GR.Jaffe

[penguin807]

Go for it, but be careful with foam and fire. Was this thread to tell us about it, or was it to ask for help?

[Jaffe]

Well the flame is to short in contact with the dart so it can't meldt or burn. This topic was to show you the progres on the gun while building it.

[DTReaper]

Just so you know rapid fire combustion is rather hard to do in itself. First off you most likely need a clip and breech thats fairly easy depending on the type you make. Second if you are going with a hybridish cannon you need to ensure that the combustion chamber is pressure rated very high because these things have very high pressure spikes; to go along with that you need to carefully measure the amount of fuel to air and pressure because if the pressure is to high then it could burst and shrpnalize everything. Not to mention the problem of exhausting the chamber after everyshot to get out spent fuels and replenish the oxygen level in the tank so that will reduce your rate of fire, perhaps a intergrated fan in the combustion chamber will help. If I remeber correctly you are into the whole spud gun community and should already know most of this if not then there you go with some problems you may encounter. Good luck with this project and be safe with it you dont know how many people are not some smart when it comes to combustion guns.

-DTR

[SHADOW HUNTER ALPHA]

Define rapid fire. The gun may be able to pull of a shot every 10 seconds if that, but if that was what you're hoping for go for it. You may also need a tank wider than 50mm.

As for this statement, it might as well be confirmed early on. Combustion guns DO NOT have enough flame contact with the dart to melt it. They are at most lukewarm after firing. It is similar to how they don't get soggy. It just doesn't happen.

[Maeric]

Are you trying to make a semi- or fully-automatic combustion rifle? Good luck. If so, just reverse-engineer a modern assault rifle. should work to a point.

[Jaffe]

@DTReaper
Thanks for the positive feedback , I think it would be hard to place a fan in the chamber. The chamber is very small and I can't find a PC fan that fits in the chamber(50MM), I think i will have to make one. For the bolt-action reloading I will use 32MM PVC pipe(grey), 5/8" PVC(grey) and 3/4" PVC(grey).

I have made some progress on the gun, I made the bae of the gun(chamber and barrel). So far it cannot shoot because I haven't installed the ignition. Further I'm working on the pistol grip for it, its made drom wood.
GR.Jaffe

[Jaffe]

Again I made progress in the gun.

• The chamber dan is almostly done, it only need to placed in the chamber.
• The bolt-action reloader is finishd

Now I need to do fuel injection, I'm stil not sure that I will use a tank for the fuel. I thoucht that a butane lichter with a hose from the valve(from the lighter) to the chamber behind the chamber fan .
My friend also told me that if I can show him that this gun works he will buy three of them
GR.Jaffe

[SHADOW HUNTER ALPHA]

If you're serious about making this with as high an ROF as possible, you ought to use a tank. Keep a butane-air mixture in that tank and use a two-ball-valve gate to let equal amounts into the ignition chamber at a time (see 3DBBQ's homemades for a better idea of this). They ought to sell butane lighter refill tanks at your local gas (or "petrol") station for cheap. You could also use propane from the large tanks that fuel gas grills.

[Jaffe]

Well in "The word of spudguns" a pipe with two balvalve's(each at one end of the pipe) is called a fuel injecton. You gave me the idea to desgin a semi-automatic valve that wil hold the fuel mixture .
GR.Jaffe