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Need some ideas for a Air powered golf ball cannon
Posted: Fri Sep 11, 2009 11:47 pm
by Northir
just like it says im making a golf ball cannon, and was hoping you guys had some tips, i only get 100 psi to work with, all ready know i need to pick up some class 200 pipe, and probably a 2" piston valve
Posted: Sat Sep 12, 2009 12:13 am
by MrCrowley
Posted: Sat Sep 12, 2009 12:20 am
by Northir
i like the second one, do you know the muzzle velocity? im looking for maximum power
and does it push full sized golf ball?
EDIT: nvm
i see your specs now, i think im going to build this, just need to figure out how to build a damn piston valve now
Posted: Sat Sep 12, 2009 12:32 am
by MrCrowley
Northir wrote:i like the second one, do you know the muzzle velocity? im looking for maximum power
and does it push full sized golf ball?
Muzzle velocity was about 160m/s I think, don't remember exactly but I was shooting aout 420-450m with it.
Yes, it fires a full sized golfball.
Posted: Sat Sep 12, 2009 11:41 am
by Technician1002
There are lots of option for building piston valves. The larger sizes are more difficult to get to work. Valve seat imperfections, friction, and forces go up quickly. So do leaks, sticking, and breakage. For this reason many golfball cannons are built with smaller valves.
Study the many designs. Pistons are made from tin cans, plywood, hot melt glue, HDPE (my favorite) and other materials. Remember in larger sizes, small gaps are big leaks.
Posted: Sat Sep 12, 2009 2:04 pm
by Northir
i dont like leaks >.> at all, anywhere, i have a Sprinkler im throwing away caus it has a small leak, anyways, MrCrowly do you have a GGDT file for your cannon, i think my #s in mine are off, i like to run GGDT be fore i build so i can get the most power, it seems pretty accurate
(This cannon
http://www.instructables.com/id/Golfbal ... /?ALLSTEPS)
Posted: Sat Sep 12, 2009 2:43 pm
by jackssmirkingrevenge
Northir wrote:just need to figure out how to build a damn piston valve now
On a silver platter 
Posted: Sat Sep 12, 2009 3:02 pm
by Northir
headed to Mclendons later for those parts
hope it works the way i want, my GGDT Sim is telling me 350Fps with 50psi
Posted: Sat Sep 12, 2009 5:18 pm
by MrCrowley
just need to figure out how to build a damn piston valve now
Did you look at both my links? That's the whole purpose of them, how to build a piston valve.
Posted: Sat Sep 12, 2009 5:32 pm
by Northir
yea im atempting to build one now, ill up my current progress
goin for a 1" to start so i can get it down before i build the GB cannon, heres pics
EDIT: not sealing at all i think i need a different sealing face (currently a bike tube)
Posted: Sat Sep 12, 2009 6:01 pm
by MrCrowley
How well of a fit is your piston in the piston housing? It looks like either your sealing face it too large, or your piston is too small.
Posted: Sat Sep 12, 2009 6:15 pm
by Northir
it fits snuggly in my 1" pvc, so it sounds like i did it wrong
Posted: Sat Sep 12, 2009 7:07 pm
by MrCrowley
If the piston fits perfect in your piston housing, that's good. Why don't you trim your sealing face to the same size as your piston?
Posted: Sat Sep 12, 2009 8:24 pm
by Northir
well theres 2 answers for that question, the first is, i lost it lol, and the second is it would slip into my barrel the piston is the same size as my ID of my 1"pcv, on another note, just got back from the hardware store, and all the peices i needed cost me 80$ us >.<
Posted: Sat Sep 12, 2009 8:34 pm
by Moonbogg
Northir wrote:well theres 2 answers for that question, the first is, i lost it lol,
OMG the tears are streaming LOOOOL! Sorry i'm finished now. Good luck.