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1st pneumatic Chrony Results!

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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1st pneumatic Chrony Results!

Unread postAuthor: Lentamentalisk » Sun Oct 28, 2007 6:45 pm

What a creative title!

anyways here it is:

Image

exploded view
Image

Image

my friend that I made it with holding it
Image

specs:
Chamber: 1.5"x2'
Barrel: 1.5"x3' (fits the little kitty catnip balls perfectly)
Valve: 1" rainbird modded.

I shot the ball straight up at just 40psi to test it and it went out of sight and I lost it forever... Off to buy more soon.

For some reason the valve is leaking like crazy, so I cant get it above 60psi even with my air compressor. Do you have any suggestions for how to fix that? Did I hook up the valve backwards?

edit: the leak is out the barrel, not escaping somewhere else. When I fill the barrel with water and start to pump it up, the water starts bubbling like crazy
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Last edited by Lentamentalisk on Tue May 06, 2008 9:37 pm, edited 1 time in total.
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Unread postAuthor: the beast » Sun Oct 28, 2007 7:01 pm

nice cannon i like how clean it looks. Perhaps the diaghram is dirty try to take it apart and clean the diaghram i could be wrong though. Gonna get any damage shots up maybe. :twisted:
first post!
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Unread postAuthor: Lentamentalisk » Sun Oct 28, 2007 7:03 pm

tennis balls don't do great damage, and none at 60psi, but when I make a marble barrel for it, I will have lots of great damage shots :-)
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Unread postAuthor: hi » Sun Oct 28, 2007 8:07 pm

very nice. it is very clean.

i have the same valve (from what i can see in the picture) and i had the same problem. it is easily solved by taking it apart. seal EVERY possible way for air to escape on the top part and put it back together. use epoxy to seal it up.
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Unread postAuthor: PVC Arsenal 17 » Sun Oct 28, 2007 8:13 pm

Nice job, although JSR is gonna spank you for using that hose!

Clever barrel support also.
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Unread postAuthor: jackssmirkingrevenge » Sun Oct 28, 2007 8:53 pm

PVC Arsenal 17 wrote:Nice job, although JSR is gonna spank you for using that hose!


yep, shorten that hose :D

also:

Image
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Unread postAuthor: Lentamentalisk » Sun Oct 28, 2007 8:54 pm

@ PVC Arsenal 17:
What is wrong with the hose?

I noticed that there is a major leak around the connection from the hose barb to the blowgun, and my pipe tape isn't working, so I'm off to ACE tomorrow after school to get some "pipe thread compound"/"pipe joint sealant".

Thanks for the suggestion Hi, I will do that
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Unread postAuthor: jackssmirkingrevenge » Sun Oct 28, 2007 8:57 pm

Lentamentalisk wrote:What is wrong with the hose?


long hose -> bigger pilot volume -> less efficiency -> worse performance
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Unread postAuthor: Lentamentalisk » Sun Oct 28, 2007 9:01 pm

jackssmirkingrevenge wrote:yep, shorten that hose :D


lol you posted before while I was working on my response.
I will get on that immediately.

jackssmirkingrevenge wrote:Image

he's not emo, he's a nerd, he just hasn't cut his hair in ages
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Unread postAuthor: jackssmirkingrevenge » Sun Oct 28, 2007 9:05 pm

In that case

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:D
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Unread postAuthor: MrCrowley » Sun Oct 28, 2007 9:48 pm

Nice and simple, good job.

And I second that hair cut.
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Unread postAuthor: Lentamentalisk » Tue Oct 30, 2007 7:14 pm

There is quite a leak between the hose barb and the blowgun. I have tried resealing it with PTFE tape, as well as the gooie pipe thread compound, neither of which worked... any sugestions?
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Unread postAuthor: PVC Arsenal 17 » Tue Oct 30, 2007 7:21 pm

Thread it more! :D

Use a several layers of tape and then apply a healthy cote of the paste compound over it.
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Unread postAuthor: jrrdw » Tue Oct 30, 2007 7:24 pm

Hose clamp, the screw kind.

Ok, i see the hook up know, check it for cracks. Tractor hydrolic lines use the same basic flare nuts, and they crack very easy. Pressurize it, stick it in a bucket of water to see exactly where it's leaking. I gussing you cracket it, to much tape can be bad.
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Last edited by jrrdw on Tue Oct 30, 2007 7:31 pm, edited 1 time in total.
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Unread postAuthor: Lentamentalisk » Tue Oct 30, 2007 7:27 pm

jrrdw wrote:Hose clamp, the screw kind.


not in between the hose and hose barb.
In between the hose barb (which has threads to thread into the blowgun,) and the blowgun.
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