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Coke Bottle Combustion

Unread postPosted: Sat Feb 12, 2005 5:13 pm
Author: PCGUY
<div align="center">COKE BOTTLE COMBUSTION

Provided By - GalFisk

This is my first spud gun, built only from parts I found around the farm. It began as a bottle with two screws in it connected to an old monitor, and a piece of dubious PVC pipe. It has been modified and improved countless times since then, the only part I'm still using is the fly back, which I eventually ripped from the monitor and built a driver circuit onto. Features: 28mm ID x1.5m HDPE barrel, 1500cc combustion chamber (C:B ratio ~1.7:1), breech loading, breech knife, wooden handles, fly back ignition w rechargeable 9V battery and capacitor battery booster, shoddy muzzle porting, easy disassembly. All cold-resistant materials. The cannon is best fired from the hip or shoulder. I use butane for fuel, or a butane/propane mix in the winter, and a bike pump for venting, or compressor if available. Good projectiles are carrots, small spuds, 1" marbles w. burst disks, 1" bouncy balls, throwing darts w. wadding.

Provided By - GalFisk </div>

Unread postPosted: Sun Jul 10, 2005 10:08 am
Author: darthtator
Thats a pretty interesting meathod. All in all pretty nice cannon. how far does it shoot? How much psi do you use? Or how much until the disk goes?

Unread postPosted: Sun Jul 10, 2005 3:53 pm
Author: spudshot
its a combustion using a burst disk, not a pneumatic, it has to burst below about 50 psi, since thats what most combustions create, you can see his burst disk marble ammo in the how to section

Unread postPosted: Thu Sep 15, 2005 5:49 am
Author: GalFisk
It shoots maybe 80-180 meters/yards depending on ammo. The longest shot was with a hunting arrow, I'd estimate carrots to 100 and marbles to maybe 130m on average. But as we all know, range estimates can be wildly inaccurate.

Unread postPosted: Tue Oct 11, 2005 4:08 am
Author: toza
i reckon it looks pretty compicated and dosent look like an easy feat but u made most things replaceable which is smart i imagine the coke bottle wouldn't last very long though.by the way what ammo did u use and do u still use it?

Unread postPosted: Wed Oct 12, 2005 1:42 pm
Author: wesjac
i just gained an interest in spud guns and posess very little knowledge in it. When u use this spud gun gun do u fill it up totally or half full, and with what? benzene, parrafin?

Unread postPosted: Wed Oct 12, 2005 3:01 pm
Author: spudshot
what? all you do is spray some fuel in and put the barrel on with a potato inside, its just like any normal cannon.

Unread postPosted: Wed Oct 12, 2005 3:46 pm
Author: beebs111
i dont think he has any clue what ur talkin about spudshot. what you do is spray some right gaurd deoderant or other fuel and press the igniter or spin the flint wheel and it goes boom

Unread postPosted: Sun Oct 16, 2005 6:44 am
Author: toza
i'm from australia and cant get a barbecue lighter or lantern lighter what do you guys sugest?

by the way what is a fly back driver and is it cheap?

Unread postPosted: Wed Nov 09, 2005 1:23 am
Author: UAE_gunner
for u in aus u could buy a lighter that instead of spining the thing on flint that it clicks. you can take out a little thing inside that makes a spark if you squeeze both ends. then on the inside of the combustion chamber glue a piece of metal and put the wire through thatmakes a spark and there you go.

Unread postPosted: Thu Nov 17, 2005 4:39 am
Author: toza
thanks alot youre a legend

Unread postPosted: Wed Dec 21, 2005 10:16 pm
Author: julz
mmm, coke...

a mate and i made 2 cannons in 10 minutes yesterday. we got one 1.25L bottle and a big 2L bottle, one was 1.5" diametre barrell and the other was 2.5".

we just duct taped the barrell and chamber together, then we drilled a hole at the end of the chamber. to shoot we just held the bbq lighter at the hole and lit it, since it didnt work when we put the lighte 'in' the hole there was a lot of flame shooting out the back of the cannon as well :)

we managed to shoot a plastic thing about 100m and another pool ball 50m.

they were pretty fun lol

Unread postPosted: Fri Dec 23, 2005 10:09 pm
Author: cardinals08
man, all I have built are two mini guns(my dad says I cant build big ones till I have my own money to do it with), I made the pill bottle one, and made one with a gatorade bottle and wiffle ball bat, the farthest I shot anything is about 75 feet, that was a K'Nex piece with a piece of tissue in the barrel with the pill bottle. I use AXE as fuel, and dont know what I can be doing wrong to not get the gatorade one to do better. Maybe its because the barrel is only about 6 inches long and a little more than an inch inside diameter

Unread postPosted: Tue Mar 28, 2006 11:31 pm
Author: Andrew52
well i have a gatorade mini sometimes if u get the right mixture its loud and powerful i have a barrel maybe 16 inches of half inch conduit im not a nube for the conduit it doesnt really matter its a mini i can shot a grape about a 100 yards

Unread postPosted: Fri Apr 21, 2006 7:45 am
Author: jjk92
what is a flyback driver?