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Schweizer-Valve Gun

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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Schweizer-Valve Gun

Unread postAuthor: dongfang » Tue Aug 28, 2007 1:04 pm

Hi,

Some of you can maybe remember I built the Schweizer-Valve. I posted some damage pics with frozen eggs and trees, and that was pretty much it. I never got around to complete the gun with a nice trigger and a barrel that doesn´t blow off.

Anyway, it´s nice enough for its purpose, which is: Neutralizing milk cartons with water, and sending golf balls so far over the sea that you almost can´t see where they land...

Here are some pictures from my shooting with it (and a few other things):
http://picasaweb.google.de/dongfangxu0/Sommer2007.

The next thing the gun needs is a truly powerful trigger. I´m not quite satisfied with the RainBird; performance goes down when I have a hose on the blowgun. The DSTV is pull-cord; not ideal for a shoulder launched gun. So I´m building a mini DFTV now, just for triggering the common barrel sealing piston valve of the gun. If that works out ok, I will use it on a 75 mm gun, and then build a full-size 1-valve 50 mm DFTV gun. I have found a combination of common parts that can just be glued together; no nuts and bolts, and no home made pistons required.

I have no picture of the best shot: The 50 mm gun blew quite some bark, and a 1" thick chip of wood off a tree a couple of days after I took the photos - with a potato.

Pumping 10 bar with a bike pump is tough; I have wrecked 2 pumps so far, and blown the hose on the 3rd. I follow this home made high pressure pump talk with some interest...

Regards
Soren
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Unread postAuthor: jackssmirkingrevenge » Tue Aug 28, 2007 1:21 pm

You must have been really tempted to launch one of those mice :D
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Unread postAuthor: dongfang » Tue Aug 28, 2007 1:36 pm

Hi,

No way, they were really nice and cute. Couldn´t harm them.

But if I got my hands on one of those dirty, nasty and noisy pigeons that there are far, far too many of in Denmark, well, then it might have become the first pigeon to exceed Mach xxx.

Regards
Soren
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Unread postAuthor: jackssmirkingrevenge » Tue Aug 28, 2007 5:35 pm

Reminds me of the first time I showed my 3" combustion to a friend;

"dude, forget shooting at mice - we can actually shoot mice lol!"

Naturally I never did, but the thought of supersonic rodents was a source of great amusement.

Nice cannon btw, really like the supports between the barrel and the chamber. Standard fittings I presume?
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Unread postAuthor: Velocity » Tue Aug 28, 2007 7:51 pm

Very clean and nice cannon.... you make some very cool things!
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Unread postAuthor: dongfang » Wed Aug 29, 2007 5:48 pm

Hi,

Jack, yes they are standard fittings, bolted back to back with a threaded rod. They aren't really good for the purpose ... whatever you use normally, just stick to it.

A 3" fat mouse? Wow. The biggest mice I have seen could easily live a whole family of 3 inside a tennis ball.. but a rat maybe... hehe if somebody does that (nah, don't), don't video the launch - no, rather video the BBQ party where the rat comes back down :)

Regards
Soren
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Unread postAuthor: spud yeti » Tue Sep 04, 2007 9:16 am

This is such a cool cannon that I love it very much :D
Why is no one commenting though!?
Oh well, great cannon dongfang, good work.
I look foward to seeing the next progression too. :P
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really good quote/phrase here
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