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UPDATED x 2 !! WMD - Now with 360 view and damage pics!!

Built a combustion 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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What do you think?

1337!!
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sux...
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Good for a first spudgun.
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Good for a first spudgun.
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Good for a first spudgun.
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UPDATED x 2 !! WMD - Now with 360 view and damage pics!!

Unread postAuthor: Hailfire753 » Sat Jun 30, 2007 1:21 pm

Hey, whats up! :P Its my second post, and here is my first spudgun! It cost me about $ 50, and took most of 4 (5?) days to assemble and cool-ize. 8) I built this gun from the highly modified Green Hornet plans from the Boogieman, adding a bunch of accessories and features. Thx Boogieman!

You can pretty much see every thing in the pics, so feel free to skip the description.

Without the silencer, the C:B ratio is about 1.25 to 1, with it is about 1 to 1. The barrel is 43'' in length, made of 1.5'' PVC, but it has holes for the silencer for the last 5''. These can be covered or uncovered by preference.

The chamber is made of 2'' of 2'' sch 40 PVC, 9'' of 3'' PVC, and 3.5'' of 4 PVC. However, the fan and batteries take up a small amount of space inside the 4'' PVC. Inside, I used a dual ignition setup, with one contact at the front and the other at the back, both powered by a grill clicker. In the back section, I also threaded a removable lantern lighter (see pic) between the contact, making 2 sparks instead of one. However, when the lighter is in, it results in a small leak.

Now, for the extra features... As I already said, I put a cheap fan in the chamber, along with a color-changing LED (Just for looks, of course) with a battery pack for it. The fan's battery pack is external. I made the barrel breach loading, but because I am cheap, it is a screw-in. However, loading is still much faster. Also, I attached two handles to the barrel for a comfortable grip. The silencer, one of the cooler accessories, is made from the left-over length of the chamber and barrel - 1.5'' surrounded by 3'' PVC. The inner barrel had holes cut in it, and the outer is packed with cotton. The assembly slides about 5'' onto the barrel, making the whole gun a hefty 6' 2''! I painted the barrel black, added a glaze, and covered the chamber in duct tape. I also added some semi-corny labels and pics that I made in flash pro and online.

UPDATE- To make the gun look more "professional", I repainted the whole gun a cool glossy black. I covered the handles and chamber in electrical tape for looks, durability, and insulation. I renamed the gun the WMD - Weapon of Mashed Destruction. Sorry if that has been used, but hey, it sounds cool. I also cleaned up and rewired the chamber, resulting in a much larger spark and a more reliable fan and light.

I have not been able to test damage or distance, because I have only shot it in my back yard 5 times. With a burst disk of painter's tape, the sound it makes is amazing! It is louder than a real gun, and a half-foot jet of flame shoots out the barrel! :shock: It shot a milk cap about 40 yards on 2 seconds of OUST. I was able to shoot two potatos, but they were both cooked, so they were too soft. :? Because of this they only shot pieces about 50 yards, shotgun style. I can only hope for better performance with uncooked potatoes.What do you guys think? Will it go farther with them? Remember, my barrel is 43'' long , but it has about 4'' of 1/8'' holes drilled at the end. With 1.25 to 1 C:B ratio, do you think I can expect better performance? Also, what ammo do you recommend?


UPDATE - I tested it with uncooked potatoes, and to my relief, they shot MUCH farther. I can only give a rough estimate, but I would say they flew 200 yards at least. To see distance pics, go to page 3. NO damage pics yet though, as my parents are not cool with me blowing things up. I'll post them sometime, though.


When I loaded the pics, I accidentally put them in reverse order. oh well. :lol: I hope they are good... :thumbup:

UPDATE - Here are some new pics of the less ghetto launcher. Check out that 360!! As far as I know, that's a first on the boards! :lol: Gotta love flash! Also, here is a really short and crappy video of the test shot.
http://video.google.com/videoplay?docid ... 2247252260

UPDATE x 2 Hey people, I finally posted the damage pics! also, here are two videos:

http://video.google.com/videoplay?docid ... 4279&hl=en - This one shows the gun shooting a spud at a board. The laughter in the video- not me. Funny in slow-mo.

http://video.google.com/videoplay?docid ... 3614498301 - This one shows the potato penatrating a 1/6'' board and the chair behind it! I found pieces of the chair 30' away! :P

These videos turned out kinda crappy for some reason. They looked fine on my computer though. :evil:
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Attachments
Spudguncomplete.jpg
The spudgun with all accesories. Left to right, you can see the silencer, the handle, OUST fuel, the triger, POP-ITS (for ammo), the shells (more about them above), and painter's tape (for burst disk)
Chamber and Ammo.jpg
Here you can see a close-up of the chamber and ammo. Clockwise from left, you can see the "explosive" round, its cap filled with POP-ITS (its cut off a bit). Next, the "incendiary" q-tip round, which is sprayed with fuel, and catches on fire. It can also be used as a tracer. Third, you can see the "frag/flac/shotgun" round, used to fire airsoft bbs or anything that will fit. Lastly, the "armor piercing" round, which is... dangerous. Its cut off, click the image below this one for the full view. Also shown is the burst disk tape. Also, note the quotations - the "incendiary" is verry unlikely to start a fire, or keep alight for its whole flight, and the "explosive" round just makes a flash and fireworks sound. The "armor peircing" round however, does its job well.
Chamber and trigger.jpg
This is the back of the chamber, complete with semi-humorus lables
(Full View to read em')
Barrel upright.jpg
Here you can see the disassembled gun and fuel
Chamber insides.jpg
Here you can see the inside of the chamber from the back, with the lantern lighter installed. It can be removed in order to stop the small leak that all lantern lighters make. When installed, the contacts make 2 sparks instead of one. I use it as a sure-fire, just in case the grill lighter fails. Also, you can see the fan and the batteries for the LED.
front contact.jpg
Here you cas see the inside of the chamber from the front. You can see the front contact, the color-changing LED, and the fan
silencer.jpg
Here's a pic of the silencer. It is made from the left-overs from making the chamber and barrel. The inner 1.5'' piece has about 100 1/8 holes drilled in it. The 3'' piece is filled with cotton to absorb the sound and slow the gasses. The whole silencer slides about 5'' down the barrel, and it meets the inner silencer barrel at a modified coupling (to accomodate the slant of the barrel).

WMD 360.swf [ 271.21 KiB | Viewed 3991 times ]

spud.jpg
UPDATE!! - I finally got around to posting the damage. Not very impressive, but then again, this was with a potato, not a battery or lead slug. Even though the potato splattered everywhere, it still pierced the 1/6'' board and the back of a chair. Of course, the potato couldn't peirce the 1/2'' wood, but it made a huge splat.
CHuck.jpg
Here is a height comparison. And it doesn't even have the silencer on! I'm somewhere over 5' tall. (photoshoped for manlyness)
Chuck with redone gun.jpg
Here is a upright pic of the redone gun. Chuck to the rescue!
poor photoshop.jpg
Poorly photoshoped pic. Here is the new and improved, repainted gun. All of the pictures below this one are old; taken before the repainting. However, I left 'em for comparison
Last edited by Hailfire753 on Sun Feb 03, 2008 4:43 pm, edited 18 times in total.
UPDATED MARCH '08
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Unread postAuthor: homedepotpro » Sat Jun 30, 2007 1:27 pm

sorta looks like a getto RPG. btw people get pissed when you double post just use the edit button
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Unread postAuthor: hi » Sat Jun 30, 2007 1:27 pm

nice. i like the extensive use of duct tape. very nice for a first.
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Unread postAuthor: spud yeti » Sat Jun 30, 2007 2:58 pm

Hey nice looking cannon you have there. Looks like you put quite some effort into making it look good, and its paid off! :D
Good job!
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really good quote/phrase here
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Unread postAuthor: SnowFlox » Sat Jun 30, 2007 3:28 pm

nice cannon !! does the silencer work ?
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Unread postAuthor: Hailfire753 » Sat Jun 30, 2007 6:17 pm

Yes, it does work. I was actually veryy surprised with its performance. It will work if, and only if built properly. I had my dad standing on the porch watching, about 20 ft away. I fired it with the silencer, and he looked at me blankly. "did it fire yet?" LOL. He heard it pretty well w/o it though.

It was a big difference w/o, which made a loud FFFWWWOOMMPP!! However, I could still hear it pretty loud w/ silencer, a "FWISsss" sound. Still, I think it is surprising that he did not hear the shot. Also, my siblings were in the room behind me, and they did not hear a single silenced shot, whereas they did hear the unsilenced ones. It consistantly served its basic purpose - to dampen the noise so it cannot be heard indoors.

Basicly, it works well enough not to scare the neighbors, as long as you dont use a burst disk. When I used that, even with the silencer, it still sounded like a gunshot.
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Unread postAuthor: TwitchTheAussie » Sat Jun 30, 2007 6:46 pm

I love it mate this is truly a beast. Also I wouldnt mention incindentary ammo here. Its against the rules I think. Anyway great spudder mate :P
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Unread postAuthor: origin unknown » Sat Jun 30, 2007 7:02 pm

This is one of the best looking combustion cannons that I have come across recently. The labeling is the best part. Very cool!
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Unread postAuthor: SnowFlox » Sat Jun 30, 2007 7:16 pm

Hailfire753 wrote:Yes, it does work. I was actually veryy surprised with its performance. It will work if, and only if built properly. I had my dad standing on the porch watching, about 20 ft away. I fired it with the silencer, and he looked at me blankly. "did it fire yet?" LOL. He heard it pretty well w/o it though.

It was a big difference w/o, which made a loud FFFWWWOOMMPP!! However, I could still hear it pretty loud w/ silencer, a "FWISsss" sound. Still, I think it is surprising that he did not hear the shot. Also, my siblings were in the room behind me, and they did not hear a single silenced shot, whereas they did hear the unsilenced ones. It consistantly served its basic purpose - to dampen the noise so it cannot be heard indoors.

Basicly, it works well enough not to scare the neighbors, as long as you dont use a burst disk. When I used that, even with the silencer, it still sounded like a gunshot.


thanks for the info !! :thumbleft:

need to make a silencer then :lol:
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Unread postAuthor: Hailfire753 » Sat Jun 30, 2007 11:51 pm

Yeah np for the info snowfox... as far as i know, they are legal in the us, but i dont know about elsewhere. (correct me if I am wrong!!)

Thanks for the comments and support, the rest of you. I am also considering building a pnuematic coaxial rocket launcher, so you might see another of my guns in a month of two. It depends on money and of course, my parents.I made another useless thread about them on the pnuematics board, and there are some cool designs posted there.
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Unread postAuthor: wanimal » Sun Jul 01, 2007 12:03 am

Good Job. If that's you in the pictures, I am definitely impressed, as I find it extraordinary that such a young person is getting into chemistry and the finer points of ammo at such a young age.
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Unread postAuthor: Hailfire753 » Sun Jul 01, 2007 12:07 am

Yep... thats me.. 8) like the sunglasses? :lol:
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Unread postAuthor: SpudBlaster15 » Sun Jul 01, 2007 12:31 am

Looks pretty...ghetto :lol:. Might I suggest electrical tape over duct tape for a chamber covering? It would look much nicer.

The inside of your chamber looks like... a mess. :lol:

You could extend the barrel another 2 feet, and along with having the effect of the silencer, you would increase performance.
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Unread postAuthor: Hailfire753 » Sun Jul 01, 2007 12:38 am

LOL. Yeah, i know about the mess, but I usually dont open it on that end anyway. I spray the fuel from the breach. As for electrical tape - i'm not sure, the silver duct tape complements the barrel, although it does look... ghetto.
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Unread postAuthor: chaos » Sun Jul 01, 2007 1:44 am

not bad at all man.... questions:..>

*how consistent are the shots w/o metered fuel?

*range? how far does/wat is the maximum range you have achieved with it?

*are you sure the silencer works? extending the length of your barrel eg:adding more pipe on the end can alter the sound a cannon makes.

*When are you coming to the dark side :twisted: ? (pneumatics that is)

Great job over all you should be proud of it.

~chaos

oh and edit: where do you live?
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