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Pneumatic vs. Combustion And Other Stuff

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Pneumatics or Combustions

Pneumatics
6
75%
Combustions
2
25%
 
Total votes : 8
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Pneumatic vs. Combustion And Other Stuff

Unread postAuthor: Jarim » Tue Aug 15, 2006 11:00 pm

Ok, My first question is are pneumatics better than combustion... i heard alot about pneumatics being alot nicer... my next question is which is easier to build... and my last question is which cost less to build...

so far ive only built combustions... i havent even been introduced to the world of pneumatics!
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Unread postAuthor: MrCrowley » Tue Aug 15, 2006 11:13 pm

Ok
1:they are more powerful,reliable they can be more fun but maybe people like gort like combustion better as they have fire,flames,muzzle flash etc and it look awsome
2:depends on how complecated your design is, e.g a propane combustion with regulator,propane meter, saftey ball valve or something like that would be harder to make then a basic pneumatic.
3:same as above a simple pneumatic would cost more then a simple combustion but depends on your design and your skill and knowledge.

oh and you dont get introduced to pneumatics you introduce yourself to them :wink:
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Unread postAuthor: Jarim » Tue Aug 15, 2006 11:24 pm

MrCrowley wrote:oh and you dont get introduced to pneumatics you introduce yourself to them :wink:


well i havent introduced myself to them lol... but yeah i think i might make a pneumatic soon... i was given a choice between pneumatic or combustion for my first gun but didnt know much about the pneumatics and thought the explosion would be cooler lol so right now i have two combustions and i think one leaks so... lol
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Unread postAuthor: mark.f » Wed Aug 16, 2006 5:24 am

I dunno. My pneumatic was easy to make compared to my combustions. It's almost done, but the piston kind of went POP so I gotta order some 1-7/8" rod off McMaster to finish it.
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Unread postAuthor: noname » Wed Aug 16, 2006 10:30 am

Actually, you can make a simple pneumatic with only 5 parts that would still be OK power wise. From back to front: Schrader Valve, 1/2" End Cap, 1/2" pipe, 1/2" Glue in PVC ball valve, 1/2" pipe. Probably like 8 bucks total.
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Unread postAuthor: theRIAA » Sat May 12, 2007 8:01 pm

combustion are always easier to make than pneumatic, you dont have to worry about little air leaks.

I still like pneumatic way better though. smaller ones have more power, and they're more "controllable"
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Unread postAuthor: Velocity » Sat May 12, 2007 8:29 pm

markfh11q wrote:I dunno. My pneumatic was easy to make compared to my combustions. It's almost done, but the piston kind of went POP so I gotta order some 1-7/8" rod off McMaster to finish it.


The piston failed or the valve failed? I am assuming it is the former...

By the way, I'd buy 2" PVC rod if I were you... it will fit much better in 2" SCH 40. You might have to grind/dremel it down a bit, but it will work much better.
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Unread postAuthor: jimmy101 » Mon May 14, 2007 9:44 am

Which costs less (compressed gas or combustion) depends a lot on what you have available in your shop.

If you have a compressor, then a ball-valve compressed air gun is probably cheaper than a basic combustion. The ball-valve is the only PVC part that would be different between the two guns and the ball-valve is probably cheaper than a flint or piezo ignitor. The compressed air gun would also have a schrader valve but they only cost a buck or two.

Of course, with a ball-valve, there is a good chance that the compressed gas gun won't perform as well as a similarly sized combustion gun.

If you don't have a compressor, or other suitable pump, then a combustion gun will probably be cheaper.

For a combustion gun, asssming you don't want to use "squirt-and-screw" fueling (which is essentially free), then you need a benzomatic torch or something similar. Benzomatics go for what, $20? Or, you could use a disposable butane lighter ($1). In either case, a $2 syringe will give you a very accurate meter system for cheap.

A chamber fan is an important component even in a basic combustion gun. Again, what it costs depends a lot on what you already have laying around. If you have a suitable fan (perhaps salvaged from an old computer), some wire, a 9V battery and any old switch, then the fan costs ~$0. If you have to go out and buy all the parts it might cost up to $20 for the fan setup.

---------

If you built a ball-valve gun you could easily retrofit it to a combustion gun and get one gun that'll work both ways.
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