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New Ignition System Design

Post questions and info about combustion (flammable vapor) powered cannons here. This includes discussion about fuels, ratios, ignition systems, safety, and anything else relevant.
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New Ignition System Design

Unread postAuthor: Karatedude13 » Tue Oct 17, 2006 7:57 pm

I've never seen anyone mention this, so I think i've probably invented it. This being said, DON'T STEAL MY IDEA. I don't mind people using it, otherwise I wouldn't post it, but don't claim you created it. If you did, you'd have already said it.

Anyway, Here it is:

I have wire on the outside that runs out for 20 ft. that runs to an emergency car battery. Inside the chamber, I have 2 small alligator clips, between which I clip a model rocket igniter. The burning igniter sets it off. I found this an obvious ignition system, but from what I've seen, no one's ever used it, save for myself.

The specs on the cannon are this:

All PVC
Standard layout
1' long chamber (4" Diameter Sch 40)
4' long Barrel (2" diameter Sch 40)
Tapered, screw-off Barrel
Butane Powered
Max Range: 312 ft.

I built this cannon for a project I did last year, which I appropriately named "Operation POEN." (I loved the Acronym: Piss Off Entire Neighborhood.)
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Unread postAuthor: unipa » Tue Oct 17, 2006 8:01 pm

that seams like it would be hard to reset.
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Unread postAuthor: djt » Tue Oct 17, 2006 8:05 pm

the ignitors will ignite the fuel every time thats for sure. i think the reason alot of people dont use this method though is because you have to pay for each igniter as opposed to buying, say,a stun gun for 30 dollars and never having to pay again.
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Unread postAuthor: ProfessorAmadeus » Tue Oct 17, 2006 8:57 pm

Its been used before. Not just for spud guns but also for remote igniting bombs. I found one on make.com just for this use.
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Unread postAuthor: noname » Tue Oct 17, 2006 10:43 pm

I've used that before, although only once because I didn't want to replace the igniter...
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Unread postAuthor: FiveseveN » Wed Oct 18, 2006 8:52 am

Hmm... using an electric match to ignite sh*t. Ya, I'm sure nobody thought of that before :wink:
It's like the guys said: not exactly a fast, reusable method. Even if you make your own matches, you're better off with a stun gun in the long run.
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Unread postAuthor: Karatedude13 » Wed Oct 18, 2006 2:04 pm

I never said that no one's ever thought of it, I'm saying that no one's ever said they've used it. And it's pretty simple to replace. That was the point of the alligator clips. Just open the clips and drop out the spent igniter, then put a new one in it's place. Takes 2 seconds, if that.
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Unread postAuthor: zeigs spud » Wed Oct 18, 2006 2:53 pm

glad your thinking. lol it would work, but i dought anyone would go through that much truble plus the cost of ignightores would add up.
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Unread postAuthor: KVINCEO » Wed Oct 18, 2006 3:23 pm

or a stun gun, click it and ur done.. then click it again... lol. not to bash the idea, i was gonna do it too, before i got a stun gun, just cuz it would be cheaper in the short run, and i hated useing a bbq lighter. after further thinking, i was just gonna get a model rocket engine, put it in the barrel and have a rocket launcher. i gave up
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Unread postAuthor: Karatedude13 » Thu Oct 19, 2006 6:44 am

Well, this is the broke spudgunner alternative. I don't have anywhere nearby where I can get a stun gun, so this is the next best thing. Plus, this is the best one for switching out different chambers, because you can switch out your chambers, which is my project. By the way, if anyone has any info on the affects of changing the volume of the chamber in relation to range, PM me. I have to have an interview as one of my sources, and this is where I think i can get one.
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Unread postAuthor: SpudBlaster15 » Thu Oct 19, 2006 9:44 am

Broke spudgunner alternative? Those model rocket ignitors are not cheap. I think this is a better alternative. Total cost was $1.50 for the lighter, and the screws and plastic spacers (covered with tape) which were placed under the head of each screw to clamp the wires in place, were found in a parts bin.

Image

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Works everytime on the first try given a good a/f ratio, and after firing, there is nothing that requires replacing. Not bad for $1.50 in parts and about 15 minutes of work.
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Unread postAuthor: jon2680 » Thu Nov 02, 2006 2:58 pm

Karatedude13 good on you for trying something you felt was different.
It may not be the best idea but is certinly not the worst. The ignitors arent cheap, however they would be more rely able than a bbq lighter. (Cant seem to get them to light every time)

Creating an spark, is a bit of a science. Different matterials require different voltages. You can creat a spark bettween certin aluminized ceramics and stainless steel at about 7500 volts. How ever this is very expenseive. Or you can use a bbq ignigtor. My piont is do what works for you, you dont need to spend alot of money or have years of experince to creat a spark.

By the way battery charge bbq lightes work really slick. I think theyre about 25-30 dollars. And unlike stunn guns are safer to use.
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Unread postAuthor: paaiyan » Sat Dec 30, 2006 6:31 pm

That's extraordinarily similar to what I'm using. I've got 12 volts worth of batteries that put current through a metal/paper strip when I push a button. I didn't feel like buying rocket ignitors so I put the foil and paper together, the foil heats up enough to light the paper. I looked at some plans for a rocket ignitor and heavily modified them for my own devious purposes.
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Unread postAuthor: mark.f » Sat Dec 30, 2006 7:40 pm

karatedude13 wrote:I never said that no one's ever thought of it, I'm saying that no one's ever said they've used it. And it's pretty simple to replace. That was the point of the alligator clips. Just open the clips and drop out the spent igniter, then put a new one in it's place. Takes 2 seconds, if that.


And how much do you think it'd cost to launch about 10 pounds of russets with this method? It's nice to see some out-the-mainstream thinking, (trust me, it's REALLY great to see this after seeing so many people getting convinced that a 30 dollar stungun is the only way to go), but an igniter out of an Aim n' Flame, a modified disposable camera, or a scrap BBQ igniter all work better. Only use in my book for those little rocket igniters is to ignite solid propellants, and even then I don't use them, I just break open a christmas light bulb and slide in a short length of genuine blackmatch. :wink:
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