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Breech loading, bolt action sniper 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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Breech loading, bolt action sniper design

Unread postAuthor: moses » Wed Jul 09, 2008 2:43 am

Image
Image
Any feedback? I would like to know if I'm going to kill myself before I build it. I will get pvc rated for 160psi for the chamber.
In regards to my previous topic, here is what I pmed every member who posted in my topic:

Just to clarify mate: My last design was operated by a hand pump, so I could only reach (only be stuffed reaching) about 40psi. That gave me about 2 shots at a dodgey and inconsistent FPS. I don't have a compressor, and can only afford a 12v one, so it would be plugged into the car lighter, or for that matter any 12v outlet. I went to Dick Smiths powerhouse (an electrical goods store) and they said a 24v-12v adapter would cost $30, which I just don't have. I'd only be able to pull about 50fps, so shooting out of a car window would be impracticable if the car was moving. My driveway extends to my backyard, which enables me to shoot from the passenger seat into my backyard. From the drivers seat, I would hit fence. The design is completely dependent on a 12v outlet, and I don't believe there would be any accuracy at speed in a car. I'm terribly sorry for causing you, and other members of this site any undue stress by leaving you with this impression. When I said "Any higher and it explodes" I was referring to the maximum psi a 2l coke bottle can hold, which is about 120 psi. I know this because I used to make water bottle rockets. "Pretty Hairy"-I was surprised and scared when my hopper blew off, this occurred because I didn't have the knowledge (at the time) to seal it off during firing with a bolt.
Any further questions?
Terribly sorry, and thanks for your feedback.
Moses.

Also this:
Thank you very much, I appreciate your understanding. I've since discovered that I have a 600amp car jump-starter, which is man portable and has a 12v outlet, so the car lighter plug is out of the equation.

Because this is not designed to be automatic, I don't need a consistent air supply. It is meant for single shot accuracy, so a compressor doesn't need to be semi-permanently hooked up.
EDIT: I forgot to mention that the pipe that the schrader fill valve is connected to will be connected to the barrel. Also, this was my first prototype, a semi-auto marble cannon: Image
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Unread postAuthor: jackssmirkingrevenge » Wed Jul 09, 2008 2:47 am

It is meant for single shot accuracy


What are you using as a valve? If it's a blowgun/pressure washer handle, it's bound to throw your aim off somewhat.
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Unread postAuthor: Tom » Wed Jul 09, 2008 2:54 am

Thats a valve for a garden hose(know what i mean), i think they have a better flow then normal blowguns! Better convert them in a hammer valve because when you want to activate the valve your aim is SC*#^*#^D :D . Especially in that PVC diagram your going to get problems with that valve.
G's from the Dutch, Tom
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Unread postAuthor: moses » Thu Jul 10, 2008 5:09 am

Yes, your very observant Tom. It has excellent flow, much better then a blowgun but it was intended for water, so no guarantees. It works well, no leaks thus far. And Jack, yes my ai will be offset somewhat, but I am hoping to negate that through a tight hold, the overall weight and the bipod. Even so, it gives me something to improve on.
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Last edited by moses on Thu Jul 10, 2008 5:26 am, edited 1 time in total.

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Unread postAuthor: Hotwired » Thu Jul 10, 2008 5:20 am

Heh, I remember using a spray gun like that for my second pneumatic.

With a C:B ratio of about 200:1 :D

Think I glued/melted a drop grip onto the barrel to help hold it when pulling the lever.
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Unread postAuthor: moses » Mon Jul 14, 2008 3:03 am

Hello again, I have a few of questions:
With the garden-hose valve, what kind of flow should I expect? Why does (almost) nobody use these? In my limited experience they have OK flow, and I don't expect more then 1 shot from the chamber. And what is a hammer valve and how does it work? (Google was no use and nor was this sites search function).
Instead of the bolt-action I am going for a modded breech loading ball-valve.
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