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igniter placement

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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igniter placement

Unread postAuthor: brumby » Fri Oct 06, 2006 10:10 pm

Where is the best place to place the sparking part of an igniter? Towards the end the the chamber, in the middle or towards the front.

Thanks
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Unread postAuthor: MrCrowley » Fri Oct 06, 2006 10:15 pm

if your only making 1 spark put it in the middle
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Unread postAuthor: brumby » Fri Oct 06, 2006 10:45 pm

What about duel sparks.... and would a bbq igniter be capable oof doing dual sparks?

Also.. I have a T pipe at the end of my chamber and a chamber fan in the T..
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Unread postAuthor: boilingleadbath » Sat Oct 07, 2006 5:45 pm

Generaly, we suggest putting a single igntion point about 1/3rd of the way from the rear chamber wall [to the front of the chamber].
In reality, I suspect the ideal location is dependent apon projectile mass and chamber dimensions (among other variables)... but this will do.

As far as I know, there are no guidelines relating to the location of the gaps when using two sparks... and short of computational solutions, I don't know.
Just locate them at 1/4th and 3/4ths, I geuss. It may not be ideal, but the difference is likely to be small.
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