Another Spud Gun newbie

Just starting to spud and wonder how long your barrel should be? Want to know how to build a better cannon? This is just the place! If you think your question is one of a newcomer, please post it in here. If your question is posted elsewhere, and it's a newcomer's type question, it will be moved in here.

Postby acspony » Mon Nov 20, 2006 8:06 pm

Let me introduce myself,
My name is A.C. and was bit by the spudgun bug a few days ago. I used the plans from this site to build the cannon. I've messed with various locations of the electrodes to try and get combustion and I've just hot-glued over the holes in the chamber I've made from moving the screws around. The current setup is shown:
http://img209.imageshack.us/img209/7159/p5100055xk0.jpg

The screw in the upper left is an old one. I have good spark and I'm not sure what my problem is. I did try the gun outside and it was probably around 40 degrees so that could be an issue. I did dry fire the gun inside though, I though I should have at least had a whoosh or something as the mixture was ignited. I've tried various amounts of hairspray and WD40 to no avail.

Looking forward to your responses,
~A.C.
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Postby np0405 » Mon Nov 20, 2006 8:22 pm

Maybe you should try some different fuels, I think that there is a WD-40 made now that isn't flammable (don't quote me on that though). What is the size of your chamber and how long of a spray are you putting in there?
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Postby acspony » Mon Nov 20, 2006 8:44 pm

The chamber is 10" by 4" long, I believe that's what the site plans said. I tried anywhere from a half a second to about 2-3 seconds of hairspray and WD40.
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Postby benstern » Mon Nov 20, 2006 9:07 pm

try a 0.5 second blast of starter fluid.
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Postby acspony » Mon Nov 20, 2006 9:12 pm

Something like this?
http://productimages.moteng.com/ZI3165-24.jpg

I tried some of that but I let it sit in the chamber for a minute or two so it would vaporize. Should I just squirt it in and light it right away?
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Postby SpudStuff » Mon Nov 20, 2006 9:41 pm

Put it in.
Close the chamber.
Shake the chamber.
Fire.
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Postby TurboSuper » Mon Nov 20, 2006 9:56 pm

Also, hot glue isn't going to save you, you need epoxy or Plumber's Goop.
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Postby Mr.Plow » Mon Nov 20, 2006 9:57 pm

Thats a pretty terrible fuel. I'd recommend using an aerosol based type, like deodorant or ether.
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Postby acspony » Mon Nov 20, 2006 10:22 pm

<blockquote id="quote"><font size="1" face="tahoma,verdana,arial" id="quote">quote:<hr height="1" noshade id="quote">Originally posted by TurboSuper
[br]Also, hot glue isn't going to save you, you need epoxy or Plumber's Goop.
<hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">

Would the cement I used for the pipes do the trick?
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Postby An Apple Pie » Tue Nov 21, 2006 7:23 am

No, I do not think that will work. It is not what you would consider glue. What it really does is kinda "melt" the two pieces of PVC together. So unless the holes are extremely small I would just go with epoxy.

You can buy Epoxy Paste at Home Depot, or at least my Home Depot. It is near the PVC Primer and Cement.
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