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So I need help with deciding what to build...

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So I need help with deciding what to build...

Unread postAuthor: Kris.Is.Awesome » Sat Jul 15, 2006 12:07 am

Okay, so I've experimented with small combustion guns, and a large pneumatic gun. The large pneumatic gun was a pain, because it was huge. 5' long 2" barrel, a 2"-6" adapter, 6" ball valve, and a 5' long 6" chamber with a schrader valve end cap.


My only experimentation with combustion is AXE and my pill bottle guns. Not much fun.



So here's the question. What do I want to build? I have a nice compressor at my house. I can do pneumatic. My mother is a hairdresser. I can get hairspray.

I dont know what I want to shoot, so I'd want to be able to adapt to different barrels. I want to take it places and shoot, so I'm thinking combustion. With a Tazer.

So if I do end up with the combustion, can I make a curved chamber? Just an idea.


What is going to be cheaper initially- and in the long run?




See- I have ALOT of questions. I was thinking of a smaller pneumatic, possibly using one of those 'portable' little electric bike pumps. Like the craftsman ones? They can do 60 PSI I think.


I just want some suggestions. Thanks... Hope you can answer all of this for me!
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Unread postAuthor: trae08 » Sat Jul 15, 2006 12:34 am

if you want portability then a combustion would be cheaper.

i am making a portible gun but it is pnuematic. rather costly but i live across from the beach so i would like to go over there an shoot so im gonna buy a 10 lb co2 tank regulate it an itll be sweet.

but if u want portbility for cheap go with combustion. And what do you mean by curved chamber?
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Unread postAuthor: CS » Sat Jul 15, 2006 1:41 am

A 6" chamber combustion would be cool. 6"x4" fittings would be the only pain to buy. And use meter propane. Thats if you want to go "BIG" but your portabilty is limited.

Or my other suggestion would be to do a normal sized pneumatic or combustion for portabilty. Just a straight up simple inline style launcher. Chamber maybe 12"x4". On the pneumatic I would reccomend a modded sprinkler, and if you were to make a combustion go with a stungun and metered propane.

Those are two things that I think would be cool to make. So we can better help you, would you lay some requirments you would like? Cost? Portabilty? Etc. Good luck in any route you pursue!
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Unread postAuthor: pyrogeek » Sat Jul 15, 2006 2:10 am

Those guys have the guns covered pretty well, as for the pros and cons of combustion and pneumatic at least.
You mentioned not knowing what you want to shoot. I would suggest just using male and female fittings with bushings to adapt to different barrels. And this way you can transport it easier.
I have a combustion with a 24in long 4in diameter chamber, metered propane, and dual sparks using a stun gun. On the end I have a 4in to 3in adapter, and a 3in female adapter. Then I have a 2in, 3in and a 4in barrel that have 3in male fittings on the ends. If you are firing spuds or other ammo using sabots (I was using the caps off of shaving cream cans to fire golf balls out of a 2in barrel) I would like to suggest using a cam lock fitting. Banjo is probably the most well known maker of these. McMaster sells these
http://www.mcmaster.com/
they are also sold at Farm & Fleet, and likely other farm supply stores
They are awesome, a little pricey (maybe $15 for a matched pair of 3in fittings), but they make breach loading spuds and golf balls in sabots so much easier.
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Unread postAuthor: Kris.Is.Awesome » Sat Jul 15, 2006 9:22 am

Thanks for all of the help sofar guys. I'm thinking for the first big scale gun, to just go combustion. It'll be easier to make- cheaper too.



So in a ballpark- how much will it take to make? I want to order some of that special 2.5in from spudtech to shoot tennis balls.


I searched for that cam lock fitting. No luck wth the search.

http://www.spudtech.com/detail.asp?id=42 This is the propane metering device I would need- correct? That's quite expensive, but I guess it can be used over and over.

http://www.spudtech.com/detail.asp?id=38 This is the barrel I wouls get. Since the threads are 2" , I could make something after the c am-lock to adapt to 2". I could then also have a 2" barrel to use for spuds.



What I dont want is an accident. I'd think that pneumatic guns are safer. The pressure is already in the gun, and if the potato is too big, and will not moove, the gun won't blow.

I've seen where the spud gets stuck in the chamber on combustion guns, and the gun explodes. I don't want that. But in genearal they're pretty safe. I'm an engineering student, so I dont think I'm going to make any real mistakes.




http://shop.com.edgesuite.net/ccimg.sho ... 348316.jpg I would use 3 of those to make a curved chamber. Just an Idea.
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Unread postAuthor: WOW!! » Sat Jul 15, 2006 9:31 am

You can make your own propane system. They are not hard to make. First you need to find your chambers Cubic inch (CI) and then go to http://www.burntlatke.com/ft_live.html put the CI in and it will tell you want size you meter pipe is, then go buy some ball vavles, pipe, barb and some hose and you are good to go.
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Unread postAuthor: plumpthumb » Sat Jul 15, 2006 10:36 am

Uhhhhhhh- Think again about the pressure of pneumatic versus combustion. At the risk of being redundant combustion pressures are much lower than pneumatic. Also, I doubt a potato would ever survive getting stuck in the barrel. The danger in a pneumatic is over pressurizing the thing; either a bad fitting goes flying or the chamber could rupture. So if you want safety go pneumatic but nothing can take the place of caution and good construction techniques.
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