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Hybrid Spark Gap

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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Hybrid Spark Gap

Unread postAuthor: squeaks » Wed Nov 01, 2006 11:22 pm

Somewhere I heard that in a hybrid spark gaps have to be smaller. Is this true? If so why and how much.
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Unread postAuthor: reaper613 » Wed Nov 01, 2006 11:32 pm

they dont have to be. i think it would be more difficult to make somthing with a large gap that can hold a lot of pressure but possible. personally i use a spark that i widened the gap on and it works just fine.
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Unread postAuthor: SpudStuff » Wed Nov 01, 2006 11:52 pm

Yes, in fact they do. If you are working on one use a extremely small gap. The comperssed atmosphere makes the spark weaker. You probably didn't notice this reaper because the max you said you used was 20 PSI.
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Unread postAuthor: reaper613 » Wed Nov 01, 2006 11:59 pm

to tell ya the truth i dont know what my max is cause i dont meter it but u r probably right about the spark
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Unread postAuthor: squeaks » Thu Nov 02, 2006 12:19 am

So say you had a stungun with a gap of 15 mm, would you have to decrease the gap to about 5mm?
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Unread postAuthor: mark.f » Thu Nov 02, 2006 6:15 am

Read the Wiki.

The length of the spark gap should be roughly inversely proportional to the density of the gas.
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Unread postAuthor: squeaks » Thu Nov 02, 2006 5:46 pm

So if you had a 4x mixture and your spark gap was normally 12mm it would roughly change to 3mm, and for a 2x mixture it would be roughly 6mm.
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Unread postAuthor: SpudStuff » Thu Nov 02, 2006 6:29 pm

Aproximently yes.
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Unread postAuthor: squeaks » Thu Nov 02, 2006 7:20 pm

Thanks a lot guys. Now I'll be prepared to blow myself up when I decide to make a hybrid(not for a while though).
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