SpudFiles

ok i've seen many diaphram or piston cannons and never understood how they got air into them, how they worked, the size of the piston or diaphram had to be. Oh and dont just say " if you need the plans you shouldnt be building spud guns" or dont say " look around for 2 seconds and you will find the answer" because ive looked and made quite a few cannons so please just help

look at this diagram : http://gbcannon.com/flash/coax.swf

The piston is not perfecly sealing the chamber than the air can go in the chamber.


here is a plan : http://img293.echo.cx/img293/8963/pistoncannon4gk.jpg


now this is how a diaphragm work :

http://www.xinventions.com/main/spud/ho ... _works.htm

LOOK AT ME! I CAN TALK REALLY REALLY BIG AND BE AN ASSHOLE TOO!

Sometimes, jrrdw, people miss small things and need a quick explanation. He said he looked, and apparently did not find his answer "VERY VERY EASY!".

damn thats some big font. well thanks to cpt.rolhart i understand the concept but doesthe phram have to be touching the barrel before the pressurising the chamber and how big should my equalization hole be?

If the air is comming from behind the valve diaphragm the air preasure should push the diaphragm against the barrel and seal it,just trial and error on a small one and if it works go bigger.