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Flint ignition

Post questions and info about hybrid (compressed gas with fuel) powered cannons here. This includes discussion about fuels, ratios, ignition systems, build types, safety, and anything else relevant.
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Flint ignition

Unread postAuthor: POLAND_SPUD » Fri Jan 14, 2011 6:26 am

[youtube]http://www.youtube.com/watch?v=bejtIfvkSw0[/youtube]

so what do you think, is it a good idea to use flint igniters for hybrids?
Any ideas how to build a flint ignition system for hybrids?
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Unread postAuthor: Labtecpower » Fri Jan 14, 2011 6:35 am

Well, it should ignite the mixture. But the trouble is to make it air-tight.
I would go with a car ignition coil, or just tear out the whole CDI system.
Mopeds have smaller systems, maybe you could try that.

Btw, off-road motorcycles have the highest ceompression ratio. I think you could take a look at that.
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Unread postAuthor: POLAND_SPUD » Fri Jan 14, 2011 6:49 am

well I've been thinking of using an air cylinder to do the job - in this way you don't have to worry about sealing... you just thread it into the chamber
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Unread postAuthor: Crna Legija » Fri Jan 14, 2011 7:17 am

if you connect it to the fan with a of center wheel you could kill two birds with one stone
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Unread postAuthor: saefroch » Fri Jan 14, 2011 7:49 am

A flint ignition system for hybrids should work, but it does have a disadvantage, it consumes oxygen. Here, omniscient suggests that you can mount a flint igniter in pre-drilled hole and seal it. A PM might be in order if he doesn't post on this thread.
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Unread postAuthor: POLAND_SPUD » Fri Jan 14, 2011 11:04 am

well it's not that it is a new idea :wink:
[youtube]http://www.youtube.com/watch?v=Pc1MfG85zX8&feature=related[/youtube]

I want to build something like that (of course it won't use BP) but with a pneumatic linear actuator instead of a hammer
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Unread postAuthor: Technician1002 » Fri Jan 14, 2011 11:13 am

Nice shot of a flash in the pan. There is no evidence of recoil or the pressure from the barrel blowing back. Nice high speed video.

Back on topic. If a spark wheel from a disposable lighter was mounted on the shaft of a small model airplane motor and given a short burst of power, it could easily strike a flint inside a hybrid chamber.

An electric motor driven flick my Bic.
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Unread postAuthor: Fnord » Fri Jan 14, 2011 12:22 pm

Why not just stick a metal striker bar in a solenoid and let it smack the flint when you close the circuit?

The amount of oxygen consumed by the flint is minimal, but I don't know if a high concentraion of propane in the atmosphere would affect the sparks' temperature.
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Unread postAuthor: Lockednloaded » Fri Jan 14, 2011 1:54 pm

BTB had a hybrid WIP that used a striker pin for ignition, Im on my phone, so I can't find it ATM, but it's his only hybrid venture, so it should not be hard to find
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Unread postAuthor: jimmy101 » Fri Jan 14, 2011 11:38 pm

A flint system really isn't going to practical. Flints are an old school combustion igniter (Coleman lantern sparker for example). I'm sure it'll work but you need to take into account that the flint will wear and need to be replaced. That means being able to open up the hybrid's chamber or being able to remove the flint assembly. That's going to be a PITA.

You really can't beat a $20 stun gun or a homebrew automotive ignition system.
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Unread postAuthor: jackssmirkingrevenge » Fri Jan 14, 2011 11:46 pm

POLAND_SPUD wrote:well it's not that it is a new idea


Looks better in HS ;)

[youtube]http://www.youtube.com/watch?v=VFKxKXtkPzE&feature=related[/youtube]

I'm with jimmy though, I don't see it being very practical.
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Unread postAuthor: Lockednloaded » Fri Jan 14, 2011 11:51 pm

Ah, I found the link BTB's hybrid venture he uses a percussion cap.

Brian the brain wrote:The ignition is a FIRST EVER percussion cap-striking pin!!
Normally used on blackpowder rifles.
I converted a strange inverted hammer valve( hit to close) into a persussion pin.
I have some percussion caps ( soon switch to the red caps in toy guns) and the ignition works!
The cap litterally detonates inside the Tee, wich is part of the chamber.
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Unread postAuthor: Happy » Fri Feb 15, 2013 8:51 am

Hey i have been tossing up an idea involving a flint hybrid cannon. Im thinking of using a Coaxial piston valve design. The idea is I place iron on the back of the piston and flint on the back of the pilot chamber, so when I vent the pilot both pieces come in contact creating a spark. Would this work and if so, how effective would it be?
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Unread postAuthor: jackssmirkingrevenge » Fri Feb 15, 2013 9:39 am

With hybrids, usually it's the force of combustion that vents the pilot... if you vent the pilot and the piston moves, your fuel air mixture will be dumped without igniting...
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Unread postAuthor: Happy » Fri Feb 15, 2013 9:49 am

So the problem here is the ignition will take to long. Ok ive come up with a soloution. Would it be possible to place a tight fitting concave piece of copper atached to the piston, that has been covered in iron facing the inside of the barrel. Then have the flint placed around the inside of the barrel. So the piston will essentially have a lip that is placed in the barrel and when vented will strike the flint igniting the mix? I know its fiddly and highly improbable but do you have any ideas of making this work?
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