SpudFiles

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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?

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.

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

if you connect it to the fan with a of center wheel you could kill two birds with one stone

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.

well it's not that it is a new idea
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I want to build something like that (of course it won't use BP) but with a pneumatic linear actuator instead of a hammer

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.

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.

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

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.

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

Looks better in HS

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I'm with jimmy though, I don't see it being very practical.

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.

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?

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...

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?