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Metal spud cannon fuel ratio.

A place to ask general spud cannon related questions.
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Metal spud cannon fuel ratio.

Unread postAuthor: Buyerz » Thu Jan 16, 2014 9:39 pm

This is the first time I have really built a spud cannon. Propane powered made out of plumbing fittings. This thing really shoots well when I take the end cap and put the end of my torch into it for about 5 seconds. It shoots about 30 meters accurately. Now im working on a propane metering/injection system. Using a regular tank valve and ball valve and a pressure gauge. I cant really get this thing to fire no matter how little or much propane I put into it. I think its lack of air or the wrong ratio. I can get it to fire if I take the cap off and let some more air in. firing it at around 50-60 degrees. Any suggestions would be appreciated. Image
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Re: Metal spud cannon fuel ratio.

Unread postAuthor: jrrdw » Fri Jan 17, 2014 8:07 am

Burnt gasses need to be vented and in doing so there is normaly enough fresh air replacement to get another working fuel/air mixture. You made no mention of a chamber fan, do you have one installed? If not they are a big help, come in all sizes and brushless should be used.

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Re: Metal spud cannon fuel ratio.

Unread postAuthor: Buyerz » Fri Jan 17, 2014 10:09 pm

What is a good type of fan to use and how should I position in inside? thanks
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Re: Metal spud cannon fuel ratio.

Unread postAuthor: jackssmirkingrevenge » Sun Jan 19, 2014 4:14 am

Buyerz wrote:What is a good type of fan to use and how should I position in inside? thanks


A PC cooling fan which fits, and wherever you want really, the idea is to create turbulence.

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