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Why did I fail?

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Unread postAuthor: jor2daje » Sat Sep 12, 2009 7:57 pm

Y jrrdw i think mcrowleys right, maybe just take the blow gun all the way off and put your thumb over the threads, this worked for me testing my valve.
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Unread postAuthor: jrrdw » Sat Sep 12, 2009 7:58 pm

Wouldn't it leak out the blowgun where it's threaded in to the sprinkler valve or damage the threads if you yank it out?



Not if you just unscrew it as fast as you can. Thats how I got the Basterd to fire the 1st time. It's a process of elimination test.
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Unread postAuthor: spudnutbutthut » Sat Sep 12, 2009 8:01 pm

the blowgun is directly connected. I covered the threads with my thumb, itm "fired" i guess..WHGATS WRONG?! :( I wasted $90 on nothing...
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Unread postAuthor: MrCrowley » Sat Sep 12, 2009 8:06 pm

jrrdw wrote:
Wouldn't it leak out the blowgun where it's threaded in to the sprinkler valve or damage the threads if you yank it out?



Not if you just unscrew it as fast as you can. Thats how I got the Basterd to fire the 1st time. It's a process of elimination test.

Oh I thought you mean yank it off without unthreading it :P

spudnutbutthut wrote:the blowgun is directly connected. I covered the threads with my thumb, itm "fired" i guess..WHGATS WRONG?! :( I wasted $90 on nothing...

Stop whining and try and give us details about how to fix your problem.
So you covered the hole with your thumb and it fired when you removed your thumb?

Is the blowgun mounted upside down? The 1/4" threads should be attached to the sprinkler valve, so it vents out the smaller 1/8" threads.

How big is your chamber? Give me diameter and length.
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Unread postAuthor: jrrdw » Sat Sep 12, 2009 8:07 pm

spudnutbutthut wrote:the blowgun is directly connected. I covered the threads with my thumb, itm "fired" i guess..WHGATS WRONG?! :( I wasted $90 on nothing...


If it fired after removing your thumb, how did you waste 90 bucks. Mod your blow gun or use a 1/4 inch ball valve to vent the sprinkler valve. If it fired after removing your thumb the blow gun was the problem.
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Unread postAuthor: spudnutbutthut » Sat Sep 12, 2009 8:16 pm

wait how do i mod the blowgun? I have the 1/4 inch side up BTW. I covered the hole with my thumb and the gun made "thwunk" noise, the thing inside didnt come out though (waterbomb, its preforated i guess)
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Unread postAuthor: Moonbogg » Sat Sep 12, 2009 8:18 pm

Any pics? Perhaps that would help.
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Unread postAuthor: MrCrowley » Sat Sep 12, 2009 8:18 pm

spudnutbutthut wrote:wait how do i mod the blowgun? I have the 1/4 inch side up BTW. I covered the hole with my thumb and the gun made "thwunk" noise, the thing inside didnt come out though (waterbomb, its preforated i guess)

Technically you shouldn't have to mod the valve, but...
http://www.spudfiles.com/forums/how-to- ... 19189.html

What do you mean 1/4" side up? Is the 1/4" side connected to the valve? Answer the questions properly if you want help.

The thing inside didn't come out? Huh?

WHAT SIZE IS YOUR CHAMBER? If your chamber is too small, sometimes the sprinkler valve will just let all the air out of the blowgun.
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Unread postAuthor: jrrdw » Sat Sep 12, 2009 8:19 pm

Can you get a picture of your set up and post it? As for modding the blow gun, the Wiki is your friend.
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Unread postAuthor: spudnutbutthut » Sat Sep 12, 2009 8:25 pm

My chamber is 2inchews which reduces into the 1 inch valve and goes back to a 2 inch barrel. The 1/4iinch side is screwed into the sprinkler valavbe, i bought it pre modded at launch potatoes.
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Unread postAuthor: MrCrowley » Sat Sep 12, 2009 8:27 pm

Well if your chamber is longer than a foot, I imagine it's not the chamber causing the problem. Is your sprinkler valve leaking from anywhere still?
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Unread postAuthor: spudnutbutthut » Sat Sep 12, 2009 8:38 pm

Well the chamber is 2 feet long, il try to seal the sprinkler valve, i dunno why its not working :(
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Unread postAuthor: MrCrowley » Sat Sep 12, 2009 8:40 pm

spudnutbutthut wrote:Well the chamber is 2 feet long, il try to seal the sprinkler valve, i dunno why its not working :(

Ok, try to seal the sprinkler valve. Where abouts is the valve leaking from?
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Unread postAuthor: jrrdw » Sat Sep 12, 2009 8:42 pm

@ MrCrowley, that would be your Monday, my Sunday unless he...well you know...
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Unread postAuthor: D_Hall » Sat Sep 12, 2009 8:57 pm

Propane coming out the blowgun isn't a problem... It's SUPPOSED to do that. The question is why isn't your valve opening.

Hmmm....

You claim the gun comes up to pressure. Check. You AREN'T complaining about the gun leaking so it sounds like the valve is sealing as it should.

But it won't open.

My GUESS: When you installed your blowgun you screwed it in too far and it is now actually holding the diaphram closed.




edit: The fact that the gun works when using the Mk 1, mod 0 thumb as the valve makes me think I may be on to something. Question: When the blowgun is installed, does the fitting extend beyond flush INSIDE the valve? If so, this is your problem!
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