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Monster Combustion

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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Monster Combustion

Unread postAuthor: Meiso2005 » Thu Jun 14, 2007 7:04 am

Hey everyone! I have ready through the forums and first would like to thank you all for the information you have shared!

I recently built my first basic combustion spud cannon with a 30" barrel. Seeing how well it works I want to build something BIGGER. I mean, WAY bigger.

I'm curious what C:B's and dimensions people have used. Also, I'm curious if huge combustion cannons are effective. If you could share your experiences I would appreciate it!
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Unread postAuthor: jackssmirkingrevenge » Thu Jun 14, 2007 7:12 am

hi and welocme to the forum.

as far as large combustions go, it doesn't get much bigger than this:

DR's basketball cannon
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Unread postAuthor: veginator » Thu Jun 14, 2007 7:18 am

or you could build a combustion version of FEAR. :twisted:
http://www.spudfiles.com/forums/fear-t7857.html
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Unread postAuthor: paaiyan » Thu Jun 14, 2007 7:35 am

Veginator your link doesn't work. As for my cannon, I think I'm sitting right around a .8:1 ratio if I remember right, it's been a while since I actually built it. All I know is it's over 8 1/2 feet long.
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Unread postAuthor: Meiso2005 » Thu Jun 14, 2007 8:24 am

What kind of distance can you get with an .8:1 ratio with your gun?
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Unread postAuthor: boilingleadbath » Thu Jun 14, 2007 12:05 pm

Meiso, check the spudwiki article on "EVBEC". I think it'll help you a lot.

That said, large combustions benefit from chamber fans and multiple ignition points.
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Unread postAuthor: paaiyan » Thu Jun 14, 2007 1:06 pm

Well i have neither a chamber fan nor multiple ignition points. But I get a pretty consistent 250 yards-ish.
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Unread postAuthor: NoXi » Thu Jun 14, 2007 4:02 pm

are u gonna use propane? if so, use .8:1 ratio. If your gonna use hairspray and stuff like that, use 1:1 ratio
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Unread postAuthor: paaiyan » Thu Jun 14, 2007 4:16 pm

By the way, I use Static Guard. This is just until I get enough cash to make a metering system.
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Unread postAuthor: Bubba05 » Thu Jun 14, 2007 8:47 pm

Mate you gust have to up size everything from your basic launcher?
1.5ltr cb to 5 ltr 65mm barrel to 105mm. I think thats how you'd do it!

Bubba
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Unread postAuthor: spudthug » Thu Jun 14, 2007 9:06 pm

why not get into pneumatics? pneumatics are usually more powerful...

but anyway combustions are always portatble....

why does everyone think metering systems are hard to make and expensive?? you need two pieces of pipe (small nipples) a tee the size of your pipe, a hose and a bottle of propane...
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4" piston valved cannon-half done..( i spilt my cement...)

Hybrid- 75% done. need to build propane holder and drill/tap sparkplug hole..
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Unread postAuthor: Brooner115 » Thu Jun 14, 2007 10:03 pm

DUDE just try to make one bigger that this guys DAMN!!!! :twisted:

http://www.youtube.com/watch?v=sdFK5eVmZ3o
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Unread postAuthor: jimmy101 » Fri Jun 15, 2007 11:04 am

spudthug wrote:why does everyone think metering systems are hard to make and expensive?? you need two pieces of pipe (small nipples) a tee the size of your pipe, a hose and a bottle of propane...

... probably also need either a regulator or a pressure gauge and a fitting for the propane tank.

Actually, all you need for a fuel meter is a $1 syringe and needle and a $1 disposable butane lighter (or a Benzomatic type torch if you've already got one.)

Like this;
Image
or this;
Image
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why not build a huge coilgun

Unread postAuthor: TechnoMancer » Tue Jul 03, 2007 12:38 am

if you want big why not build a huge coilgun it would be very funny watching the target being totally destroyed as the slug hits it!!
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