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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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Unread postAuthor: natas » Thu Mar 08, 2012 3:43 pm

guess its gonna look a bit like a steel version of the bl-520 :-). i like the loading system on them, looks good.
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Unread postAuthor: natas » Fri Mar 09, 2012 5:30 pm

found some usefull parts in the shop :-) , maybe time to start posting in showcase ? :-)


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Unread postAuthor: natas » Wed Mar 14, 2012 2:21 am

hmm.. if i make the camber in steel... what should i use to isolate the stungunwhires for the ignition going trough the chamber ? ... tried to find some ifo in the hybrid section.. but no luck..
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Unread postAuthor: jackssmirkingrevenge » Wed Mar 14, 2012 2:31 am

You could go for an actual spark plug, assuming you find the right thread size.
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Unread postAuthor: natas » Wed Mar 14, 2012 1:32 pm

will look pretty techy... 3 sparkplugs on the chamber !
milled and threaded a sparkplug holder for welding in on the chamber, will try this out and see how it works :-)

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image uploaded from my phone, sorry if its wrong size
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Unread postAuthor: jackssmirkingrevenge » Wed Mar 14, 2012 2:20 pm

Pictures are a little huge, but looks good :)

What do you plan on using as an ignition source? For a piezo the gap is a little small, you want 5-6mm. If you're going high voltage it's fine as is.
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Unread postAuthor: natas » Wed Mar 14, 2012 3:13 pm

im using a 100k stungun as ignition, and plan to bend out the spark gap as far out as possible. not sure if its possible to set multiple sparkplugs in a serie tho. electronics is not my strongests field :roll:
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Unread postAuthor: jackssmirkingrevenge » Wed Mar 14, 2012 3:32 pm

natas wrote:not sure if its possible to set multiple sparkplugs in a series tho.


Yes :) and no need to widen the spark gap in that case.
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Unread postAuthor: natas » Wed Mar 14, 2012 4:21 pm

is it possible to whire them like this ? :-)

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Unread postAuthor: quark1980 » Wed Mar 14, 2012 5:49 pm

nope, only one will spark in practice, in normal applications......

each plug would need its own coil....

edit,

the stungun however could make a difference.... not sure
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Unread postAuthor: Crna Legija » Thu Mar 15, 2012 1:07 am

natas wrote:is it possible to whire them like this ? :-)

Image


you might need 3 + wires one for each plug but i'm no elerowizz
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Unread postAuthor: jackssmirkingrevenge » Thu Mar 15, 2012 1:17 am

You showed them in parallel.

For it to work in practice it needs to be wired like so, so the launcher body cannot be the ground because otherwise only one will spark.
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Unread postAuthor: Technician1002 » Thu Mar 15, 2012 1:37 am

A proper current sharing transformer between the ignition source and plugs can enable the use of multiple plugs on a grounded chamber.

This is common in lamp circuits for flat screen displays so all lamps have the same current and intensity.
http://www.google.com/patents/US20050093471
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Unread postAuthor: natas » Thu Mar 15, 2012 2:44 am

hmm...guess im back to the first problem if i cant use the chamber as ground. :-)
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Unread postAuthor: SpudFarm » Thu Mar 15, 2012 9:42 am

Hvor i Norges land holder du til?

What I would have done in your case would be to use only one spark plug and have a burst disk instead, that is if you are looking for optimal performance and not so much after ROF. This way you eliminate some of the performance loss over servral sparks as the gasses can burn almost completely before you have the disk bursting.

You could have a look on spark strips, those are fairly simple to make and creates sevral sparks.
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