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two new spud guns

Post questions and info about combustion (flammable vapor) powered cannons here. This includes discussion about fuels, ratios, ignition systems, safety, and anything else relevant.
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two new spud guns

Unread postAuthor: Sosebee » Wed Sep 24, 2008 12:04 am

i am just using a bunch of pvc pipe and some screw on caps. i have been using pvc glue to glue everything together. im using hairspray as fuel. coleman lantern ignitor as the spark. they have been decent for shooting range. like 50-75 yards.

<a href="http://smg.photobucket.com/albums/v208/hobopetshop/?action=view&current=PIC_0190.jpg" target="_blank"><img src="http://img.photobucket.com/albums/v208/hobopetshop/PIC_0190.jpg" border="0" alt="Photobucket"></a>

<a href="http://smg.photobucket.com/albums/v208/hobopetshop/?action=view&current=PIC_0196.jpg" target="_blank"><img src="http://img.photobucket.com/albums/v208/hobopetshop/PIC_0196.jpg" border="0" alt="Photobucket"></a>

<a href="http://smg.photobucket.com/albums/v208/hobopetshop/?action=view&current=PIC_0203.jpg" target="_blank"><img src="http://img.photobucket.com/albums/v208/hobopetshop/PIC_0203.jpg" border="0" alt="Photobucket"></a>

<a href="http://smg.photobucket.com/albums/v208/hobopetshop/?action=view&current=PIC_0208.jpg" target="_blank"><img src="http://img.photobucket.com/albums/v208/hobopetshop/PIC_0208.jpg" border="0" alt="Photobucket"></a>
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Unread postAuthor: starman » Wed Sep 24, 2008 12:27 am

Lots of DWV there. Check around the site...you'll find this stuff is frowned upon. These basic combustions should be ok but you should retire them soon and move on to a more standard configuration. Also try to do a neater job with your primer.

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Unread postAuthor: Sosebee » Wed Sep 24, 2008 12:32 am

ya i know that these guns are pretty bad, they are just prototypes. i am working more and more and doing some more research to build a bigger and better gun. and ya, the primer runs every where
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Unread postAuthor: starman » Wed Sep 24, 2008 12:42 am

Just take your time and take in some more info around the site here. You'll learn a lot and you'll be more confident on your next project.
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Unread postAuthor: Hydra » Wed Sep 24, 2008 4:53 am

these are ok for your first. But now that u have experience try making a Pneumatic (sprinkler valve?) next time. Youll see the huge difference.
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Unread postAuthor: mark.f » Wed Sep 24, 2008 8:34 am

When did DWV for basic combustions start becoming frowned upon?

Anybody who has used a cleanout cap has used DWV, so I don't see the validity of that argument.
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Unread postAuthor: starman » Wed Sep 24, 2008 9:09 am

markfh11q wrote:When did DWV for basic combustions start becoming frowned upon?

Anybody who has used a cleanout cap has used DWV, so I don't see the validity of that argument.


Like, forever....? It's tolerated for new spudders as at least not being a time bomb but also typically suggested they move on and beyond in their next build.

Yes of course cleanout caps are used commonly...and they also get blown out commonly.
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Unread postAuthor: LikimysCrotchus5 » Wed Sep 24, 2008 4:00 pm

I used DWV on a propane combustion and it never gave me problems, (the DWV).

But it goes along with how you feel with it. You also see others making propane combustions with ABS, and it works fine for them as far as i know.

If you look in the showcase, there are a couple of ABS combustions. Take this one for example. Its also mapp gas and he uses its built with DWV and ABS.
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Unread postAuthor: JDP12 » Wed Sep 24, 2008 4:32 pm

fairly good guns., good job for a first. I have DWV fittings on my combustion gun and it hasn't failed yet.

and likimys- i hate to hijack this topic but can you look at my latest thread in pneumatic discussion, i need this gun done by friday, and i would appreciate your help
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Unread postAuthor: TurboSuper » Wed Sep 24, 2008 4:33 pm

Ahhh, don't listen to all the bullcrap. Your cannons work? Awesome :D
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