This weekend im making a simple pneumatic golfball cannon. What i want to know is what the minimum volume/length my pressure chamber needs to be to get a good result out of the cannon.
The barrel is 1m 40cm (4Foot 7In) long (i can allways shorten it)
and for the pressure chamber i plan to use 50mm pipe which is rated to about 200psi. i will only be using it 100-150.
Also i was wondering where is can get a cheap sprinkler valve in australia. i tried the add on the site for <13 dollar sprinkler valves but they don't ship to australia, and if i get it off the internet i don't think it would get here in time.
Thanks for your help!
Golfball cannon questions.
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Crna Legija
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bunnings sell sprinkler valve. i would go for a 1.2:1 C/B ratio. and dont shorten your barrel, longer is better (try not jsr) 
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Technician1002
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Definitely don't shorten it. Good performance can be had with high pressure and a moderate size chamber. Here is my Marshmallow cannon. I have a selection of screw on barrels for various ammo sizes. The golfball barrel is the one attached to the launcher in this photo.
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Gun Freak
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DO NOT cut the barrel, leave it as long as possible. Why don't you try making a 2" piston valve? It is very simple and probably the best valve to use for a golf ball gun (Don't wanna hear it, Tech )
)OG Anti-Hybrid
One man's trash is a true Spudder's treasure!
Golf Ball Cannon "Superna" ■ M16 BBMG ■ Pengun ■ Hammer Valve Airsoft Sniper ■ High Pressure .22 Coax
Holy Shat!
One man's trash is a true Spudder's treasure!
Golf Ball Cannon "Superna" ■ M16 BBMG ■ Pengun ■ Hammer Valve Airsoft Sniper ■ High Pressure .22 Coax
Holy Shat!
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Stolly32123
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I might make a piston valve. but how would i make the piston?
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Gun Freak
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For a 2" piston, the easiest way would be a 1.25" coupling with plugs on each end. Then, bolt on yourr rubber sealing face and wrap it with duct tape until it fits, or if your feel like it, add o-rings for a tighter fit. Have a look at Superna, my first 2" piston cannon for a more detailed look at a 2" piston valve, also the Hubb Library has a link on how to make a 2" piston with a built in check valve, like mine. The check valve prevents backflow into the pilot area from the chamber, so the cannon loses less air and opens quicker.
OG Anti-Hybrid
One man's trash is a true Spudder's treasure!
Golf Ball Cannon "Superna" ■ M16 BBMG ■ Pengun ■ Hammer Valve Airsoft Sniper ■ High Pressure .22 Coax
Holy Shat!
One man's trash is a true Spudder's treasure!
Golf Ball Cannon "Superna" ■ M16 BBMG ■ Pengun ■ Hammer Valve Airsoft Sniper ■ High Pressure .22 Coax
Holy Shat!
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clemsonguy1125
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A simple how to for the entire gun including 2 pistons
http://www.instructables.com/id/Golfbal ... That-Shoo/
http://www.instructables.com/id/Golfbal ... That-Shoo/
That is all.
A great piston material for a 2 inch piston valve is 2 inch UHMW Plastic Rod from McMaster... The ID for 2 inch SCH 40 PVC is 2.047, so a 2 inch rod is a very nice fit with one wrap of electrical tape.
Site: http://www.mcmaster.com/#
Part Number: 8701K49
Site: http://www.mcmaster.com/#
Part Number: 8701K49