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7ft long, metered MAPP injected combustion gun

Built a combustion cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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7ft long, metered MAPP injected combustion gun

Unread postAuthor: SpudBlaster15 » Wed Jan 31, 2007 12:54 am

You may or may not have seen my other thread detailing this gun, but it had only 2 pictures, and revolved almost soley around my fuel meter. So, here is a more detailed outlook on the most fun launcher I have built in my spudding history.

Specifications:

Construction Material: Solid wall ABS pipe
Chamber: 4" x 16" (220ci including the elbows)
Barrel: 2" x 80" (250ci)
Ratio: Approximately .88:1
Fuel: Metered MAPP gas
Mixing/Venting: Coghlan's camping fan w/remote switch
Loading: Breech load through Union
Ignition: Piezoelectric igniter w/2 spark gaps
Ammo: Potatos
Range achieved: 210 yards
Noise output: Moderate

The gun:

Image

Union Loading:

Image

Chamber/Meter view:

Image

Fan switch:

Image

Fan setup:

Image

Meter pipe:

Image

Handle/Trigger setup:

Image

Please leave your comments.
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Unread postAuthor: killagorrila99 » Wed Jan 31, 2007 1:05 am

Nice! I'm starting to like your work, alot!
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Unread postAuthor: joannaardway » Wed Jan 31, 2007 4:33 am

I like it too. Good job.
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Unread postAuthor: zeigs spud » Wed Jan 31, 2007 6:27 am

wow very nice i bet it is acurate! i saa your post becore this is much better lol! :D
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Unread postAuthor: MrCrowley » Wed Jan 31, 2007 3:55 pm

Damn! Im working on a MAPP metered combustion as well :P Nice job.
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Unread postAuthor: StealthSpud » Wed Jan 31, 2007 4:12 pm

That's a kick ass gun! Keep up the good work!!! :P
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Unread postAuthor: iknowmy3tables » Wed Jan 31, 2007 4:18 pm

whats so specail about MAPP?
cool fan switch, is it really metal
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Unread postAuthor: MrCrowley » Wed Jan 31, 2007 4:54 pm

Its better then propane, according to BLB 10% velocity increase compared to propane I think, Something to do with the rapid combustion or something like that :?
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Unread postAuthor: SpudBlaster15 » Wed Jan 31, 2007 6:40 pm

This is what is so great about MAPP gas. 30mph higher velocity than propane at the ideal mixture.
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Unread postAuthor: medievalman » Wed Jan 31, 2007 9:01 pm

very nice gun, i cant wait to build me a metered cumbustion! :lol:
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Unread postAuthor: fom » Tue Feb 06, 2007 8:22 pm

Really nice gun...Your signiture is hilarious!
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Unread postAuthor: scrpnframe » Thu Feb 08, 2007 4:20 pm

holy crap dude. i just built my first spud gun last night and this is a far away land from where mine is sitting. i didn't know spud gunning was getting so advanced. i just hope it doesn't go mainstream...
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WOW!!

Unread postAuthor: WAYNE » Thu Feb 22, 2007 8:48 am

NICE GUN!!

I will have the true semi auto matic gun soon. 1.5 inch barrell.
clip holds 5 spuds. pull the tigger. kachunk, kachunk, kachunk, kachunk,
kachunk. 5 shots that quick. the mother of all spud guns is almost done.

Wayne :o
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Unread postAuthor: tylerthetatertosser » Sun Mar 04, 2007 12:40 am

this gun is friggen awsome.
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Unread postAuthor: noname » Sun Mar 04, 2007 1:13 am

Just wondering, do you need a regulator on the meter or not? How do you get the right pressure? I really don't want to buy a reg online, but that's the only choice, unless there's an easier way. I was thinking of just using a blowgun as one of the ball valves, to let propane into the meter slowly, so I could stop letting propane into the meter when it was at the right pressure.
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