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1.5 inch sch 40

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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1.5 inch sch 40

Unread postAuthor: Anon » Wed Aug 30, 2006 7:15 pm

Ok so I bought some fittings and 1.5 inch sch 40 for my 1st pneu I will be building in september and was wondering what length do most of you use so it doesnt sag. Obiviously at 10 feet it sags because mine does. As for the cannon design its a 3 inch chamber with the 1.5 inch for a barrel.
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Unread postAuthor: benstern » Wed Aug 30, 2006 7:46 pm

Most of us use 5-7 foot barrels.

What type of valve will you be using?
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Unread postAuthor: ProfessorAmadeus » Wed Aug 30, 2006 7:46 pm

Cut it down to 9 then 8 then7 and so on untill its straight. By the way thats a nice 3d image :)
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Unread postAuthor: schmanman » Wed Aug 30, 2006 7:58 pm

yeah, It is a good 3d image. I like the blue iridescent bluish purple low
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Unread postAuthor: boilingleadbath » Wed Aug 30, 2006 9:24 pm

"strait"
Bah...

Deflection in solid stock goes as the cube of the length, IIRC. I don't know what it'll be in a hollow tube like this, though...

Point being that no matter how short you cut it, it'll still deflect some.
/nitpicking
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Unread postAuthor: Anon » Wed Aug 30, 2006 11:16 pm

Thank you all. Its just my budget is tight dont wanna have to rebuy anything. As for a valve I was thinking 1.5" QEV maybe. But thats my 1st 3d image in rhino without reading any tutorials.
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Unread postAuthor: Velocity » Wed Aug 30, 2006 11:17 pm

getting the QEV off of ebay?
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Unread postAuthor: mark.f » Thu Aug 31, 2006 5:31 am

Just remember to buy from a store that doesn't brace two ends of a fricking 10' section of pipe at the two far ends so that the pipe sags like a woman with liposuction.

Also, I have an 8' 1-1/2" SCH-40 barrel and it doesn't bend too much.
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Unread postAuthor: Anon » Thu Aug 31, 2006 9:24 am

Yea Rmich thats probably where I am going to get one.

--edit--
Rather than start a new topic, heres a question. I wanted to know the pressure rating on a sch40 PVC union. I was looking at 4880K305 union on mcmaster but did not see a rating anywheres.
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Unread postAuthor: Grandtheftyourwife » Sat Sep 27, 2008 11:55 pm

what softeare you use to create image ? I like it looks good
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Unread postAuthor: Velocity » Sun Sep 28, 2008 1:51 am

Topic is over two years old; he probably will not respond.
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Unread postAuthor: mark.f » Sun Sep 28, 2008 8:51 am

In other news, Google literally will provide you the answer, lock stock and barrel.
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