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large diameter barrel

Post questions and info about hybrid (compressed gas with fuel) powered cannons here. This includes discussion about fuels, ratios, ignition systems, build types, safety, and anything else relevant.
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large diameter barrel

Unread postAuthor: JDP12 » Wed Apr 28, 2010 2:57 pm

I currently have a 3/4" copper barrel for my hybrid rifle, but would like one with diameter of 1.25" or 1.5". While I could buy some copper, I really wouldn't prefer to due to pricing....

So I know spudblaster uses ABS, but I haven't been able to find any....

I'd like to think double sleeved PVC in 1.25" or 1.5" would be okay, but would it? I could really get a copper pipe, but it'd be roughly $50 dollars. If it comes down to it for safety I will, but if double sleeved PVC would work in those two diameters, I'd prefer to use that.

Just worried about it shattering--opinions?
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Unread postAuthor: deathbyDWV » Wed Apr 28, 2010 3:23 pm

How about sleeveing any 1.5 inch pipe in sch80 PVC?

Then you could sleeve a gb barrel or jet regular 1.5 inch...
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Unread postAuthor: SpudBlaster15 » Wed Apr 28, 2010 3:50 pm

I wouldn't use a PVC barrel on a hybrid launcher, especially one that will be fired from a hand held position. It might hold up reasonably well if sleeved, but due to the failure characteristics of the material, I wouldn't take the chance.

ABS is a much tougher and more impact resistant resistant material, and although it isn't incredibly common in the USA, it shouldn't be impossible to find. Even the cellular core material would be superior to PVC in this application.

Copper would be ideal, but as you mentioned, it is very expensive. It's also rather heavy, and a large diameter copper barrel of a reasonable length would likely weigh the front of a launcher down and make it difficult to aim. ABS has the advantage of being much less dense than both copper and PVC; my 4' solid wall barrel makes up less than 15% of the launcher's overall mass.

I'd take a look around Home Depot or similar suppliers; many American spudders have claimed to be able to buy short lengths of ABS pipe at such stores.
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Unread postAuthor: JDP12 » Wed Apr 28, 2010 4:53 pm

Yea, tried HD, no luck. Well have to see, id really like not to have to hold up a bloody heavy copper pipe, but if thats what it comes to, oh well,
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Unread postAuthor: daberno123 » Wed Apr 28, 2010 8:17 pm

Steel tubing isn't too expensive but it is heavy... Aircraft Spruce has good prices and sells by the foot.

http://www.aircraftspruce.com/catalog/mepages/4130tubing_un1.php
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Unread postAuthor: JDP12 » Wed Apr 28, 2010 8:26 pm

Yea i know steel is cheap, but there is absolutely no way i am luggin around a 1.5" by 5 foot steel pipe on a shoulder fired launcher!! Lol.
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Unread postAuthor: Heimo » Thu Apr 29, 2010 1:01 pm

how about an aluminum barrel. it wont be as heavy as steel and it would be plenty strong
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Unread postAuthor: D_Hall » Thu Apr 29, 2010 3:37 pm

JDP12 wrote:Yea i know steel is cheap, but there is absolutely no way i am luggin around a 1.5" by 5 foot steel pipe on a shoulder fired launcher!! Lol.

Why not?

I've got a 6' long, 1.7" barrel (sch 10, 1.5" pipe). It's not that bad. Wouldn't want to on a hike with it, but for recreational plinking, it's fine.
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