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Simple yet effective combustion cannon

Built a combustion cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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Simple yet effective combustion cannon

Unread postAuthor: SpudBlaster15 » Wed Oct 18, 2006 11:40 pm

Well I just finished up my latest combustion cannon. It is made of Solid wall ABS pipe and features a 3" x 15" combustion chamber, and a 2" x 24" detachable barrel. I also have a 2" x 12" barrel which I put on when I feel like making lots of noise at the cost of some performance, and a 2" x 36" barrel which I put on when using the gun at night. This barrel quiets it down quite a bit, at the cost of some performance. The 24" barrel is perfect, as the combustion chamber is 1.5x its volume, and the gun will fire over 200 meters when using a 15 second shot of butane gas as fuel. Ignition comes in the form of a long nosed BBQ lighter which I disassembled and removed the fuel tank, safety, and nose portion. I extended the wires, which now attach to 2 screws threaded into the CC and are held tightly in place by plastic stops placed directly under the head of each screw. The ignition is very reliable, it produces a nice spark which ignites the air/fuel mixture every time, as long as I acheive a proper a/f ratio.

The cannon:

Image

Trigger mechanism:

Image

Ignition:

Image

Detachable barrel to chamber joint:

Image

The fuel I use (lighter refill can with nozzle from WD-40 can):

Image

Chamber fan:

Image

Fan wired from inside of chamber through 2 posts and screws, then through a spare switch harness from one of my Nitro RC cars, and a spare 6 AA holder, also from one of my Nitro RC cars.

Image
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Last edited by SpudBlaster15 on Sun Oct 22, 2006 11:13 pm, edited 1 time in total.
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Unread postAuthor: experament_u2 » Thu Oct 19, 2006 12:27 am

thats a nice gun i like the plain combustion look
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Unread postAuthor: killagorrila99 » Thu Oct 19, 2006 1:57 am

Yes, Very nice. Around how much better distance do you get with butane?
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Unread postAuthor: SpudBlaster15 » Thu Oct 19, 2006 9:34 am

I live on 4.5 acres of land, 2 of that being heavily treed. On the opposite side of the trees, there is a highway. Total distance from the far end of my yard to the highway is around 200 meters. With butane, the potatos land on the road if I aim at the correct height. I have also tried old spice red zone spray, axe, and diethyl ether, and none of them compare. My best shot using these fuels was around 150 meters, using a 1 second spray of ether. I have yet to try propane, which to my knowledge should provide similar performance to butane. I might just have to try it today.
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Unread postAuthor: SpudBlaster15 » Sun Oct 22, 2006 11:08 pm

Well today I mounted a chamber fan using a little ingenuity and some stuff i had laying around. This thing sure makes a difference. My muzzle velocity icreased dramatically. Pics have been added to the first post.[/img]
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Unread postAuthor: malman » Wed Oct 25, 2006 2:20 am

Hey Quick question. So im very new to this and am going to buld my first gun this weekend which is this very gun this friday but im wondering what is the fan for? Im assuming its to mix some air in there to get the right air/fuel ratio am i right?
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Unread postAuthor: SpudBlaster15 » Wed Oct 25, 2006 5:34 pm

It helps to vent the chamber after each shot, and also helps to properly mix your air and fuel before each shot, resulting in higher muzzle velocities.
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Unread postAuthor: malman » Wed Oct 25, 2006 9:02 pm

So do you turn it on for a brief second after inserting your fuel? Then again after the shot?
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Unread postAuthor: SpudBlaster15 » Wed Oct 25, 2006 11:49 pm

Yeah, I run it for about 5 seconds before and after each shot. It sure helps to vent the chamber. I redid my setup using proper connectors and no electrical tape, haha, so I can snap a better picture of the complete setup in a bit if you want.
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Unread postAuthor: subterranean » Thu Oct 26, 2006 4:52 pm

the chamber fans are really ment just to mix fuel but yes they do vent the chamber a little bit but if thats all you want it for i dont suggest it.
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Unread postAuthor: subterranean » Thu Oct 26, 2006 4:57 pm

this question has not come up yet but for any one new with chamber fans it probably will.WILL THE FAN IGNITE THE FUEL IN THE CHAMBER? no it wont it is a brushless motor(doesn't make sparks)
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Unread postAuthor: malman » Thu Oct 26, 2006 11:23 pm

Im So Very new to this and the only gun i have made so far is a pill bottle mini. Now this question might seem dumb to most if not everyone here but for me its a serious question. What keeps the fan from burning or getting damaged in the chanber?
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Unread postAuthor: SpudBlaster15 » Fri Oct 27, 2006 9:53 am

The fan's "porosity" allows the flame front to simply pass right through it, leaving it unmoved. The duration of heat exposure is not high enough to damage the fan.
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Unread postAuthor: naitoshisou » Sun Feb 11, 2007 1:35 pm

now all in all, how much did this cost?

My buddy and I made 2 identical
3:18 chamber
2:36 barrel
looks almost identical to yours except no fan
the two together cost roughly $45
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Unread postAuthor: SpudBlaster15 » Sun Feb 11, 2007 4:28 pm

Approximately...

3" to 2" reducer - $4
3" coupler - $3
3" cleanout adapter w/plug - $7
1ft of 3" ABS pipe - $2.50
2" male threaded adapter - $2
2" female threaded adapter - $2
2ft of 2" ABS pipe - $2.50
Long nosed lighter piezo sparker- $2

...$25CND.
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