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First Airgun

Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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Unread postAuthor: jackssmirkingrevenge » Sun May 15, 2011 3:45 pm

Looks good for an initial effort, my main criticisms are:

- far too much pilot volume, its probably similar to your chamber volume!

- a cheap slide valve or three way valve could have replaced both trigger and chamber refill ball valves, and made the design much more efficient and quicker to operate.
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Unread postAuthor: Alster370 » Mon May 16, 2011 1:39 am

I could have gone with a three way valve but I was being cheap as usual and just went for two ball valves. :roll:

As regards to the pilot volume I couldn't really think of a configuration where I could reduce it, the space between the joints and tee could of been reduced but I wouldn't be able to fit my hand comfortably round the trigger. :D
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Unread postAuthor: jackssmirkingrevenge » Mon May 16, 2011 4:13 am

Alster370 wrote: but I wouldn't be able to fit my hand comfortably round the trigger. :D


... you could have attached the pilot ball valve directly to the QEV, then fitted an extension lever to the handle to act as a trigger.
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Unread postAuthor: Alster370 » Mon May 16, 2011 12:01 pm

I just realised when testing for leaks that I can use the pressure release on my pump as a pilot for my gun. It works very effectively, and instead of dumping all of the spare compressed air it only takes a quarter or so of the pressure away. So instead of refilling the secondary chamber , im only topping up the air which is stored in it. So could i say I have effectively reduced pilot volume by 75% in theory right?

On a sadder note, when testing the airgun with 0.12bb at 40psi , one bounced off several objects resulting in it making a very small but annoying crack on my lovely 23" acer monitor. :(
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