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A fairly simple method for combustion cartridges

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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A fairly simple method for combustion cartridges

Unread postAuthor: Justin Sane » Sun Aug 31, 2014 7:50 pm

Wouldn't it be possible to make cartridges using a fill station ( couple of valves and a barbed fitting) to fill a balloon or preferable a section of latex tubing with a pre mixed amount of fuel I e propane and oxy and then have a simple mechanism to insert into the barrel and a firing pin as in a needle moves forward pops the balloon or tubing filled with a pre mix charge and then ignites it in the chamber or the space between the projectile and the back of the barrel any thoughts
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Re: A fairly simple method for combustion cartridges

Unread postAuthor: jrrdw » Mon Sep 01, 2014 9:20 am

Sounds like Rub Goldberg would be proud....
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Re: A fairly simple method for combustion cartridges

Unread postAuthor: Technician1002 » Mon Sep 01, 2014 4:16 pm

For safety, Please do not premix your fuel and Oxygen. A static discharge or other accident is very dangerous. Especially do not transport mixes in a vehicle. Danger goes way up when confined or larger amounts are stored together.

Please use fuel and air only.

Example of an accident with a premix of fuel and Oxygen in balloons that made the news.
Be advised to read the story that the link below leeds to, you will be required to answer a question or subscribe to the artical. DO SO AT YOUR OWN RISK! Added by jrrdw.
http://www.bakersfieldcalifornian.com/l ... ield-party
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Last edited by jrrdw on Mon Sep 01, 2014 4:40 pm, edited 1 time in total.
Reason: Added disclaimer.
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Re: A fairly simple method for combustion cartridges

Unread postAuthor: Justin Sane » Sun Sep 07, 2014 5:06 pm

I understand the concerns of the above but I am talking small 1" diameter by maybe 3" vinyl tubing you know the stuff slingshots are made of and let's say instead of pre mixing due to the safety concerns what if the tubing was just filled with the amount if propane 4% by volume you would normally introduce and also I have no idea who the Goldberg character you are referring to is
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Re: A fairly simple method for combustion cartridges

Unread postAuthor: MightyBlue » Sun Sep 07, 2014 6:14 pm

Hows the project now?
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Re: A fairly simple method for combustion cartridges

Unread postAuthor: dart guy » Wed Oct 29, 2014 4:14 pm

I do like pictures about what you are thinking, I may be able to help you with crazy ideas XD
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