Heres another little drawing.

Okay, I get it now...
But it is still flawed, if the pressure in the chamber is at say, 100 psi it is going to take at least 100 pounds to open it.
And I'm guessing you were planning to take it to a higher pressure than that too.
And I understand how you open it either.
I think you should go with a ...

What i have shown is the open valve and when it is open no more air can enter the chamber so i dont lose any extra air. When it is closed the chamber can fill with air the piston that blocks the co2 is skeletonised if you didint guess that already. plus i can get a 20 lb co2 tank with a regulator ...

That helps alot thank you i thought of the same thing heres another idea for a valve/chamber <a href="http://s581.photobucket.com/albums/ss258/dirker88/?action=view&current=Untitled.jpg" target="_blank"><img src="http://i581.photobucket.com/albums/ss258/dirker88/Untitled.jpg" border="0" alt="xcvxc ...

Yes but i am figuring out a way to open the valve by a button or a trigger so i dont have to open it manually.
You could make a spring-loaded hammer to push back the pin, opening the piston. I hope you understand... If not, I'll draw up a diagram.


I think i understand like a pinball machine ...

Something like this ?

yes some thing extremely similar to the one shown but being actuated by a pneumatic piston for the fastest opening speed possible.

That one is pretty fast. The initial opening is by impact, much like a pool cue striking a cue ball. After that the rest of the opening is ...

jackssmirkingrevenge wrote:

dirker88 wrote:If you dont understand imagine pulling a plug in a bathtub.

Something likethis?

yes some thing extremely similar to the one shown but being actuated by a pneumatic piston for the fastest opening speed possible.

Heres an idea a coffee can sized chamber of aluminum with a 2 inch diameter hole there is a piston that seals the chamber when the piston goes back the air is realeased. So the valve and the chamber is a single unit. If you dont understand imagine pulling a plug in a bathtub.

You might find somebody to do it but be aware you will need solid plans for them to machine off or make cad's.

Everything needs to be covered in them but you need to do much more research

That will actually be a large part of the project diagrams specifications and such i spent most of the day ...

It is ok for someone to machine components and partially assemble my cannon(the things that i don't have the machinery to do myself) as long as it was built under my design and i have proof that it was. And i am going to try to start this project as early as i can. If anyone can help me with design ...

Thankyou for the resources mark.f

Ok i want to build something along the lines of th Mauler Cannon at Launch Potatoes but all nicely machined aluminum with a bigger chamber and a longer barrell i want the same kind of valve(if thats possible). I hope you guys are understanding me on this.

for some reason i dont think the school would allow anything combustible they said i am walking the line as it is. So come on guys Info, Pictures, Ideas .

I would like to keep it completely pneumatic.

Mark, my topic is pneumatic engineering this is how i will tie my product into my project. It will be farily complex i will have to put a toal of 20 hours into the entire project.