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| Piston Valves Explained Visually |
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| MrCrowley |
 Posted: 06/30/2008 22:30 PM Post subject: |
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Blizzard of Ozz
Joined: 23 Jun 2006
Posts: 6187
3319.40 Spud Bux
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Wood, deodorant can, 1 1/4" coupler, hot glue...
I cover the former two in my how-to:
http://www.instructables.com/id/GolfballAntennaNerf-Cannon---Build-One -That-Shoo/
Because otherwise air will leak into the barrel as nothing is sealing the barrel. Because the chamber is getting sealed, air still can leak into the barrel. So by adding o-rings, the barrel is completely sealed off. Whereas in a barrel sealer, the barrel is already sealed so o-rings aren't required. |
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| Jleon |
| Posted: 09/29/2008 18:04 PM Post subject: |
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Private
Joined: 29 Sep 2008
Posts: 1
9.21 Spud Bux
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I've noticed that most of these pistons are 2 inches and smaller, is there a reason for that?
I was planning a barrel sealer with a 2 inch barrel and 4 inch chamber. My piston was going to be a 3 inch coupler, and that fits inside the 4 inch PVC pretty much perfectly. I haven't seen anything quite at that scale here.
So is it just really heavy? obscenely inefficient? or just ridiculously dangerous? |
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| Hotwired |
| Posted: 09/29/2008 19:20 PM Post subject: |
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UK Spudgunner
Joined: 13 Oct 2006
Posts: 1808
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No, no there's no limit.
There certainly are much larger than 2" pistons around, I can think of a 90mm one off the top of my head but it's buried in the showroom somewhere. Even larger ones are about.
It just gets more expensive as you build bigger cannons.
There's the cost of building at a larger scale, the kind of recoil which can smash the plastic to bits if not dealt with plus the heavy air consumption of very large cannons to consider.
Oh yes and they're bloody noisy  |
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| MrCrowley |
| Posted: 09/29/2008 19:32 PM Post subject: |
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Blizzard of Ozz
Joined: 23 Jun 2006
Posts: 6187
3319.40 Spud Bux
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| Jleon wrote: | I've noticed that most of these pistons are 2 inches and smaller, is there a reason for that?
I was planning a barrel sealer with a 2 inch barrel and 4 inch chamber. My piston was going to be a 3 inch coupler, and that fits inside the 4 inch PVC pretty much perfectly. I haven't seen anything quite at that scale here.
So is it just really heavy? obscenely inefficient? or just ridiculously dangerous? |
There are three 4" piston valved cannons I can think of, of the top of my head. So i'm sure there are more. Just use the forum search tool, and limit the results to the Pneumatic Cannon Showcase and search 4" or similar, sure you will get some dud results but shouldn't be much. |
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