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the big bang

A place to ask general spud cannon related questions.
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Unread postAuthor: dongfang » Sat Jul 21, 2007 5:54 pm

Hi

- and please please fish all the wreckage back out of the lake afterwards. Otherwise it would stay, but what for?

Regards
Soren
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Unread postAuthor: trae08 » Sat Jul 21, 2007 9:22 pm

ok sorry for not replying for a day or two. well yesterday i got home from work to find out my grandpa took his camera with him to a meeting he had. so i couldn't do what i planned.. but today i was at work and started thinking what if i put the guns in a 50 gallon drum and put the lid on and blew them up in there... and when i got home i did... and heres what i found out. both these guns were made with dwv fittings. they both were over 1 year old. and one of them was dropped once before. the smaller gun held over 200 psi as you see my gauge only goes up to 200psi. but it went beyond the 200 before it exploded. the second one blew up just a few seconds after it hit 200 psi. the drum was empty no water or nothing so these results are solid. anyway heres the pics.


clide wrote:I must disagree with your conclusion. The reason that DWV fittings are not safe is that they are not held to the same standards as PW fittings. Sure yours held 200 psi, but if you had grabbed a different fitting from the box or used a different brand it may have gone at 60 psi.

Even if they all held 200 psi, a 1.5:1 or even a 2:1 safety factor for something with such catastrophic and possibly deadly failure characteristics is pretty lousy.



the little gun. also the first to go bye bye. old picture but i did paint it green and thats why the pieces are green.

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the remains.


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this is the second gun or the red gun.. before...
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this is when i was about to blow up the second gun. the red one. this is at 100 psi.
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same gun same gauge now at 150 psi
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same gun and stuff now and 200 psi.!!
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the remains of the red gun...

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the tools and setup i used to get the job done.

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Last edited by trae08 on Tue Jan 13, 2009 10:05 pm, edited 2 times in total.
Marvin the Martian: Where's the kaboom? There was supposed to be an earth-shattering kaboom!

Marvin the Martian: The Earth? Oh, the Earth will be gone in just a few seconds.

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Unread postAuthor: Jumpin Jehosaphat » Sat Jul 21, 2007 9:26 pm

Wow those guns really exploded! :shock:
Nice pictures.
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Unread postAuthor: BCS_89 » Sat Jul 21, 2007 9:34 pm

:D hehe i was there, need big boom, u should have seen the barrel after wards, it was dented pretty heavily on the inside, im sure if this were to happen and ur were in close proximity to it, u wouldnt be coming out unscathed, so be careful and dont try it
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Unread postAuthor: trae08 » Sat Jul 21, 2007 9:36 pm

yea he was there he helped me do it all. and yea the 50 gallon drum did have alot of dents in it afterwards that were not there before. and thanks Jumpin Jehosaphat i tried my best. wish i had some bullet proof glass or somthing i would have took a video.
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Marvin the Martian: Where's the kaboom? There was supposed to be an earth-shattering kaboom!

Marvin the Martian: The Earth? Oh, the Earth will be gone in just a few seconds.

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Unread postAuthor: MrCrowley » Sat Jul 21, 2007 9:47 pm

Image

Reminds me of Eddie Van Halen's Guitar:

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Unread postAuthor: trae08 » Sun Jul 22, 2007 8:04 am

yea it does kinda.
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Unread postAuthor: VH_man » Sun Jul 22, 2007 8:15 am

hahahaha. at first, when i saw that, i thought you had blown up eddie's guitar too. i was like NOOOOOOOOOOOOOOOO.

have you tried filling a pressure chamber to say, 125 PSI and then shooting it with a small-bore gun? this would simulate dropping from an insane hieght......................... i know i did this with a soda bottle and lets just say it destroyed a sawhorse when it went flying...........
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Unread postAuthor: clide » Sun Jul 22, 2007 3:48 pm

trae08 wrote:the smaller gun held over 200 psi as you see my gauge only goes up to 200psi. but it went beyond the 200 before it exploded. the second one blew up just a few seconds after it hit 200 psi. so heres the conclusion dwv fittings are ok for guns i still don't suggest it but unless you put more then 150 psi in your gun then you should be fine.


I must disagree with your conclusion. The reason that DWV fittings are not safe is that they are not held to the same standards as PW fittings. Sure yours held 200 psi, but if you had grabbed a different fitting from the box or used a different brand it may have gone at 60 psi.

Even if they all held 200 psi, a 1.5:1 or even a 2:1 safety factor for something with such catastrophic and possibly deadly failure characteristics is pretty lousy.
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Unread postAuthor: trae08 » Sun Aug 19, 2007 8:12 pm

also something i just realized. i used 3 inch cellular core pvc on both of those guns..
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Marvin the Martian: Where's the kaboom? There was supposed to be an earth-shattering kaboom!

Marvin the Martian: The Earth? Oh, the Earth will be gone in just a few seconds.

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Unread postAuthor: VH_man » Sun Aug 19, 2007 8:14 pm

and it took 300PSI too!!!! wow...........................

next time you have one of thsese to blow up, pressurize it to 100 PSI and then shoot it with a marble gun or something behind some kind of target, or hook up a hammer or a large rock to a tring you can cut from a distance.

if it can hold it, great, its impacts thats the problem. if you drop a cellular core gun while pressurized, BOOM!!!!. with PVC, maby a BOOM!!! if you do it hard enough, and metal.......... dink.......... lol.
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Unread postAuthor: trae08 » Sun Aug 19, 2007 8:22 pm

noo it took 200 psi... not 300. yea make another one an shoot it with my golf ball fun
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Marvin the Martian: Where's the kaboom? There was supposed to be an earth-shattering kaboom!

Marvin the Martian: The Earth? Oh, the Earth will be gone in just a few seconds.

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