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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: wyz2285 » Tue Jul 27, 2010 4:51 am

Some one plz help me,I'm really new at combustion cannons.
And i'm trying to make a mini one first,i used a chamber fan,a spark ignitor, using a mix of butane and propane.But a can't get it ignited!! :x some body plz tell me why and what's the basic things i need to make a good mini combustion cannon?thanks :)
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Unread postAuthor: jackssmirkingrevenge » Tue Jul 27, 2010 4:55 am

How are you getting fuel into your chamber? Getting the correct fuel/air ratio (around 4% in your case) is very important for reliable function, especially in smaller combustions.

You might want to consider using a syringe:

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Unread postAuthor: wyz2285 » Tue Jul 27, 2010 5:39 am

how does it works, i do like to build a fuel inject system,but don't know how :oops:
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Unread postAuthor: jackssmirkingrevenge » Tue Jul 27, 2010 5:42 am

Ok, what is the volume of your chamber?
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Unread postAuthor: wyz2285 » Tue Jul 27, 2010 5:47 am

i think is about 300cm2
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Unread postAuthor: jackssmirkingrevenge » Tue Jul 27, 2010 5:49 am

So, grab a syringe and lighter setup like in the photo above, measure 12mL of fuel, inject it into your chamber, voila ;)
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Unread postAuthor: wyz2285 » Tue Jul 27, 2010 5:51 am

so i have to take out the syringe for the lighter frist?than inject in to the chamber?
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Unread postAuthor: jackssmirkingrevenge » Tue Jul 27, 2010 6:00 am

Yes.

Don't worry about the gas leaking out of the nozzle while you do that ;)
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Unread postAuthor: wyz2285 » Tue Jul 27, 2010 6:04 am

ok,that's easy.but is there some way that i can do it with out move the syringe?
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Unread postAuthor: POLAND_SPUD » Tue Jul 27, 2010 6:31 am

what do you mean by
with out move the syringe
??
you can use manometric metering but, AFAIK, it is a bit trickier to get right than this method
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Unread postAuthor: jackssmirkingrevenge » Tue Jul 27, 2010 6:35 am

You could also have a valve between the syringe and the chamber, which is closed when you fill the syringe, then open it and push in the plunger.

You'd also need a way to vent the chamber though.
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Unread postAuthor: wyz2285 » Tue Jul 27, 2010 3:37 pm

thanks,this helps a lot :D
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