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Newbie needs advice

A place to ask general spud cannon related questions.
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Newbie needs advice

Unread postAuthor: sponge bob hunter » Tue Aug 07, 2012 4:51 am

I have two potato cannons made of ABS they have 14 to 16 inch combustion chambers with approximate 5 foot barrels they are ignited by scavenged BarBQ igniters and fueled with hair spray. I havve found first that neither work well (beyond a single shot) in a Canadian winter. I attribute this to condensation providing a connection between ground and sparker along the inner surface. I tried widening the gap a the entry point with little improvement. The real problem is with the smaller bore gun it is only good for a shot or two and often misfires although visually exhibiting a good spark. I am a Newbie with a primitive system by your standards after looking around but need advice. Sponge Bob
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Unread postAuthor: mattyzip77 » Tue Aug 07, 2012 7:25 am

Your gap should be a 1/4 inch and you are probably using too much hair spray. Try a 2 to 3 second squirt of aqua net hair spray. Must be aerosol and not the pump kind. good luck..
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Unread postAuthor: jsefcik » Tue Aug 07, 2012 9:30 am

Trying Carb cleaner or propane measuring
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Unread postAuthor: jimmy101 » Tue Aug 07, 2012 12:44 pm

Misfiring only after a successful shot suggests that your aren't adequately purging the combustion gases from the chamber between shots.

Also, at low temperatures fuel mixing is pretty slow. Add a chamber fan or simply wait a minute or two after fueling.

Metering will also help a lot.
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