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coaxial or not?

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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coaxial or not?

Unread postAuthor: Gun Freak » Wed Jan 27, 2010 9:48 pm

some of you have seen both of my new designs, i am wondering if the co-ax is typically better or not. im also wondering if a blowgun alone will have enough flow to release my pilot volume quickly.
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Unread postAuthor: clemsonguy1125 » Wed Jan 27, 2010 10:03 pm

Well personally I like the tee piston valve better because its just as powerful and easier to build. And no unless its a mini you want a ball valve or sprinkler valve.
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Unread postAuthor: Marffy » Thu Jan 28, 2010 12:07 am

I'd go with a tee piston too. it will be easier to make a breech or something if you want.
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Unread postAuthor: Gun Freak » Thu Jan 28, 2010 6:38 am

ok thanks. pics and vid up this weekend :D
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Unread postAuthor: maverik94 » Thu Jan 28, 2010 2:06 pm

And no unless its a mini you want a ball valve or sprinkler valve.
I disagree. I used a modified blowgun to pilot my .25 cal coaxial gun, which had a .5" piston and chamber. It all has to do with your dead volume and your piston's tightness. JSR has used a mere schrader to pilot some quite large guns.
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Unread postAuthor: psycix » Thu Jan 28, 2010 3:57 pm

clemsonguy1125 wrote:Well personally I like the tee piston valve better because its just as powerful and easier to build. And no unless its a mini you want a ball valve or sprinkler valve.

Disagree.
Coaxials are easier to build.

When going very advanced, a T-piston valve is theoretically slightly more powerful, but the differences are neglectable.

Whether or not a blowgun is enough depends on the piston fit, diameter and weight. Maverik is right on that.
However, if you want to avoid a higher chance of pilotting troubles, you may be better off using a simple ball valve.
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Unread postAuthor: Gun Freak » Thu Jan 28, 2010 5:09 pm

kk if i make a coaxial i will use a ball balve.
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Unread postAuthor: McCoytheGreater » Fri Jan 29, 2010 12:42 am

I'd go with a coaxial. 1: you'll get a lot of Hats-off-to-ya's for putting in the work. 2: They look freaking cool and 3: It's a piston valved gun. Sure a lot can go wrong with it, but once it gets working, it can work well and it seems like you wouldn't have to worry with as much barrel bracing as with an over-under style gun, much like our howitzer. Good luck with either build.
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Unread postAuthor: Gun Freak » Fri Jan 29, 2010 6:05 pm

what do you mean "a lot can go wrong with it?"
i dont wanna waste 30 bucks on a gun.
are coaxials reliable? i plan on piloting it with a modded sprinkler valve.
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Unread postAuthor: chinnerz » Fri Jan 29, 2010 6:45 pm

my piston is made with hot glue and a rubber plate, and i am using a modded blowgun wih it, it is working just fine... Well no, a few times i have had the piston move back so fast that it got stuck :p, nuthing a small stick cant fix
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Unread postAuthor: Gun Freak » Fri Jan 29, 2010 6:57 pm

how do u mod a blowgun? is it better than a modded sprinkler?
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Unread postAuthor: twizi » Fri Jan 29, 2010 9:46 pm

no dude not at all a blow gun is 1/4 a sprinkler can be 2 inch's
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Unread postAuthor: Gun Freak » Fri Jan 29, 2010 9:59 pm

i know but is a modded one any good?
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Unread postAuthor: MrCrowley » Fri Jan 29, 2010 10:37 pm

chinnerz wrote:my piston is made with hot glue and a rubber plate, and i am using a modded blowgun wih it, it is working just fine... Well no, a few times i have had the piston move back so fast that it got stuck :p, nuthing a small stick cant fix

Add a 1/2" ball valve and I'll think you'll notice a difference :)
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Unread postAuthor: chinnerz » Sat Jan 30, 2010 3:11 am

ill give it a go on my next build :P i have lots of space limitations right now
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