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Trouble with ignition.

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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Trouble with ignition.

Unread postAuthor: Deterrent » Sun Apr 05, 2009 12:54 pm

This is just weird. I can't get ignition with my little spud gun.

The chamber is a 1" iron pipe. I am using a camera flash for ignition, after having tried piezos without success. The spark from my camera is very solid.

I am using butane, but I have also tried a mix of combustible gases.

Any idea what might be wrong? I never had this much trouble with ignition with my first spud gun.
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Unread postAuthor: mark.f » Sun Apr 05, 2009 12:59 pm

How long is the 1" iron pipe?

If it is fairly short, you will probably have a bit of a hard time getting a good mixture without something like a syringe.
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Unread postAuthor: Deterrent » Sun Apr 05, 2009 1:06 pm

EDIT: sorry, I mean 50mm long, not 80
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Last edited by Deterrent on Sun Apr 05, 2009 1:10 pm, edited 1 time in total.

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Unread postAuthor: mark.f » Sun Apr 05, 2009 1:08 pm

Yup, I would work on a more accurate way of fueling your gun. A small syringe to fill with butane should work.
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Unread postAuthor: jimmy101 » Sun Apr 05, 2009 5:33 pm

1" ID x 2" long?
Chamber volume is just 1.57in<sup>3</sup>.
4% is 0.062in<sup>3</sup> (1.0cc).

1cc isn't very much. Probably need a 10cc or smaller syringe.
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