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mapp gas

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: matthouse357 » Sun Aug 27, 2006 2:19 am

does it matter if the spark is in the center of the chamber or the back end
where it screws on at,, (working with like a 3 1/2 foot barrell and like id say roughly 1 1/2 foot chamber.. 2inch into 3inch
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Unread postAuthor: matthouse357 » Sun Aug 27, 2006 2:20 am

i got a new yellow can of mapp gas
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Unread postAuthor: Jolly Roger » Sun Aug 27, 2006 5:14 am

Dear Matt,

How is your yellow can of mapp gas? I hear you are very fond of it. Is it a bright can or a sort of off yellow can. I wonder if it is a big can or not, I would presume it to be in between; not big like a scuba tank but not small like a soda bulb either. Please reply because I think everyone is really interested to hear about your yellow can of mapp gas.

Yours sincerely,
Jolly Roger
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Unread postAuthor: matthouse357 » Sun Aug 27, 2006 11:43 am

damn, i wrote that last night? i woke up laying next to my yellow can of mapp gas? wtf
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Unread postAuthor: spudmonkey » Sun Aug 27, 2006 8:25 pm

i use mapp gas all the time, usually i also use oxy with it, but i ran out of oxygen, i prefer mapp over propane dont exatly know why
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Unread postAuthor: schmanman » Sun Aug 27, 2006 8:45 pm

Dear Matt,

How is your yellow can of mapp gas? I hear you are very fond of it. Is it a bright can or a sort of off yellow can. I wonder if it is a big can or not, I would presume it to be in between; not big like a scuba tank but not small like a soda bulb either. Please reply because I think everyone is really interested to hear about your yellow can of mapp gas.


Wtf, that's funny.

anyway,mapp gas has been used,and as far as I know,It is not terribly more powerful than propane. but with oxygen, it is more powerful.
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Unread postAuthor: matthouse357 » Sun Aug 27, 2006 10:15 pm

yeah i tested it out today and its mapp gas all the way,, big bangs
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Unread postAuthor: DonTheLegend » Sun Aug 27, 2006 10:53 pm

Mapp gas is slightly more powerful than propane, but i doubt you would notice it unless your measuring the muzzle velocity. Burnt Latke tested both propane and mapp gas and here are the results:
http://www.burntlatke.com/lpmapprussets.html
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Unread postAuthor: Jolly Roger » Mon Aug 28, 2006 9:26 am

Propylene is a really good one. They use it in welding applications. It has a higher max flame temp then propane, slightly less than MAPP gas but it has a higher heat distribution than both which means more pressure and bigger bang. It is a type of LPG so being in liquid form bottles can hold alot more than propane or MAPP gas - more shots.
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Unread postAuthor: matthouse357 » Mon Aug 28, 2006 2:56 pm

sometimes it doesnt fire untill i unscrew the back then screw it back on
,, is this a lack of oxygen?
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Unread postAuthor: spudmonkey » Mon Aug 28, 2006 6:27 pm

are u trying to fire it more than one time in a row? if that is the case you are a retard and the awnser to your question is yes
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Unread postAuthor: matthouse357 » Mon Aug 28, 2006 6:34 pm

yeah i guess i am retarded, i shoot potatos in the house, scared mofos
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Unread postAuthor: spudmonkey » Mon Aug 28, 2006 7:34 pm

damn ur smart, shootin it inside the house, wonderin if you used all the oxygen in last combustion, wake up cuddeling ur brand spankin new yellow bottel of mapp gas, talkin about how much u like morters expecally the 500g ones, you kno you actually make me feel smarter :D
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Unread postAuthor: Jolly Roger » Mon Aug 28, 2006 10:48 pm

But yeah Matt, it would be lack of oxygen. Just try putting in less gas...
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Last edited by Jolly Roger on Mon Aug 28, 2006 10:50 pm, edited 1 time in total.
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Unread postAuthor: MrCrowley » Mon Aug 28, 2006 11:37 pm

most people shoot their spudguns in a row,i dont do one shot and put it back in the closet,you just need to air it out for 1min if you dont have a fan or 10sec if you do.
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