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Feedback on my coaxial piston design

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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Feedback on my coaxial piston design

Unread postAuthor: Superairrifle » Mon Oct 24, 2011 5:45 pm

Hay
This is my idea for my new airgun.(it's the 4. one i think...)

I just want to know what you think about it.

Blue: Air tank (bore 4cm 115cm long , pressure 20 Bar)
Yellow: Barrel (bore 1.4cm 100cm long)
Light red: Moveable thing in the tank.
Dark red: Valve ( trigger)
Orange : Bike valve
Brown : Magnet that holds the bullet in place. (I hope that it will work a bit like a hop up in an airsoftgun and make the bullet rotate)


When The tank is filled with air you open the dark red valve to shoot.
It shout work like a QEV.

What do YOU think of this plan?


Edit by Moderator (MrCrowley): Changed the topic title.
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Unread postAuthor: warhead052 » Mon Oct 24, 2011 5:50 pm

Yeah, its called a coaxial cannon. I have never made one, but assuming that piston is sealed on the barrel, it should work. Just make sure it has a bumper. And welcome to the forums.
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Unread postAuthor: Goats spudz » Mon Oct 24, 2011 5:52 pm

Co-axial cannon and yes it would work and the movable think is called a piston you could use hot glue with a rubber face
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Unread postAuthor: Gun Freak » Mon Oct 24, 2011 6:04 pm

Moveable thing in the tank

lol, piston.

I hope that it will work a bit like a hop up

Nope.

What do YOU think of this plan?

Nothing that hasn't been done before :wink:
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Unread postAuthor: Superairrifle » Tue Oct 25, 2011 4:16 am

Okay thank you!
I think i will try it like this :)
I will post a picture when the rifle is ready.
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Unread postAuthor: cammyd32 » Tue Oct 25, 2011 4:24 am

Yes I have seen many coaxial cannons like this, as long as it is made well then it will work beautifully.
good luck on construction! :D
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Unread postAuthor: jackssmirkingrevenge » Tue Oct 25, 2011 4:24 am

Make sure there is very little space between your "moveable thing in the tank" and the walls of your "fixed thing that contains breathing stuff packed inside" ;)
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Unread postAuthor: CpTn_lAw » Tue Oct 25, 2011 4:33 am

jackssmirkingrevenge wrote:Make sure there is very little space between your "moveable thing in the tank" and the walls of your "fixed thing that contains breathing stuff packed inside" ;)


LOL :D great one :D

Aside from that...
Piston needs to be extra light, almost airtight while keeping minimum friction with the chamber wall. Your idea of a magnet could be improved to act as a back-spring, if your piston contains steel, it could allow you to fill the chamber from somewhere else than the back of the spudgun. You'd need a square based cylinder-type neodymium magnet glued on the very base of the barrel.
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Unread postAuthor: jackssmirkingrevenge » Tue Oct 25, 2011 6:56 am

CpTn_lAw wrote::D great one :D


If that's what it takes to drag you out of the shadows these days ;)
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Unread postAuthor: Superairrifle » Wed Oct 26, 2011 2:45 pm

I've got a 2*1*3cm big neodymium magnet :wink: hope it will be big enough 8)



sry 4 my not perfect English ;)
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