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Carnage! Updated (with more videos)

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: VH_man » Thu Aug 09, 2007 5:02 pm

someone needs to make a saboted tungsten dart for their large-bore hybrid..........

seriously.

anyway, in relation to the fact the dowel didnt shatter, ive come to the concusion that the impact of stresses are lessened on projectiles severely. seeing as i can put a POTATO through plywood i think theres something holding the spud together. it would be a fun topic to look into. its almost like individual molecules bond tigher when hit at higher velocities.
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Unread postAuthor: jackssmirkingrevenge » Thu Aug 09, 2007 9:33 pm

VH_man wrote:anyway, in relation to the fact the dowel didnt shatter, ive come to the concusion that the impact of stresses are lessened on projectiles severely. seeing as i can put a POTATO through plywood i think theres something holding the spud together. it would be a fun topic to look into. its almost like individual molecules bond tigher when hit at higher velocities.


I think it's simply got to do with velocity, you can cut steel with water if you shoot it fast enough. Besides, how intact is your potato after passing through the ply?
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Unread postAuthor: DYI » Thu Aug 09, 2007 9:42 pm

The SCTBDC can put a hole through an unknown amount of plywood (I've only tried up to 1") with a potato, but I've never found any more than a wet spot on the plywood left of the potato. I would agree that it is caused by sheer velocity; a 700 foot per second chunk of spud has a lot of energy, and it transfers enough of the energy to do some damage before it is turned into a cloud of starch.
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Unread postAuthor: DYI » Fri Aug 10, 2007 8:27 pm

Updated original post with ice slug video and picture of the slug disintegrating on impact with the target.
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Unread postAuthor: spud yeti » Sat Aug 11, 2007 1:46 am

Just watched the video..... WOW! Thats some damn power you have there. May I suggest creating a spring loaded stand for it though. Then it wont fall off every time and it will reduce your recoil.
How much did the ice slug weigh?
Otherwise, that was beautiful!
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Unread postAuthor: jackssmirkingrevenge » Sat Aug 11, 2007 4:14 am

You have a very understanding mom lol. and a floppy barrel :D
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Unread postAuthor: spud yeti » Sat Aug 11, 2007 4:26 am

JSR wrote:and a floppy barrel :D


Baad mental image :shock:
Haha, but did the ice shatter once it went through the board? (I couldnt see it in the video :wink: )
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Unread postAuthor: jackssmirkingrevenge » Sat Aug 11, 2007 4:30 am

spud yeti wrote:Haha, but did the ice shatter once it went through the board?


Judging by the lack of maternal outrage at any holes made in the structure behind the target, I'm guessing it did ;)
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Unread postAuthor: spud yeti » Sat Aug 11, 2007 4:45 am

JSR wrote:Judging by the lack of maternal outrage at any holes made in the structure behind the target, I'm guessing it did


yeah, too true :D. I wish my mom would do stuff like video my guns for me... DYI, can I adopt your mom? :lol:
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Unread postAuthor: DYI » Sat Aug 11, 2007 10:03 am

Has anyone ever seen the episode of Mythbusters where they tried to make a functioning bullet out of ice? Now we know that they just didn't have a big enough gun.

I need to make a stand sometime, but it will need to be good and sturdy to avoid being destroyed by the recoil. There may be a 3" bore, 1000 ci chamber combustion in the works, and the stand for it will be a priority.

The ice slug weighed 260 grams, and we never found any trace of it afterwards.

Tonight I will update with a video of the "broomstick" (to use Jack's terminology), that caused the original carnage. I'll probably set up a wood target about 4" thick, put up a strong backstop, and try to fire through the whole thing. It may not be as spectacular as the ice, due to the lack of a fragmenting projectile.
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Unread postAuthor: jackssmirkingrevenge » Sat Aug 11, 2007 10:09 am

DYI wrote:Has anyone ever seen the episode of Mythbusters where they tried to make a functioning bullet out of ice? Now we know that they just didn't have a big enough gun.


That or they were using rifles that generate in excess of 30,000 psi of hot gasses that leave your ice slug less likely to remain intact that when fired relatively slowly from an air cannon.
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Unread postAuthor: DYI » Sat Aug 11, 2007 10:24 am

Well yeah, I know why it didn't work, but it could if it were fired from a large bore pneumatic rifle. That kind of goes against the myth though...
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Unread postAuthor: spud yeti » Sat Aug 11, 2007 12:06 pm

email them :D
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Unread postAuthor: goathunter » Sat Aug 11, 2007 12:22 pm

I like the ice slugs.And your ma is a whole lot more embracing of spudguns than mine.Mine adopts the "do I really need to know" policy.Whereas my dad is like cool! Just don't kill yourself.

About Myth busters,I quit watching them because a lot of the stuff they say can't be done can be done.They just aren't smart enough to do it properly.
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Unread postAuthor: spud yeti » Sat Aug 11, 2007 12:31 pm

goathunter wrote:About Myth busters,I quit watching them because a lot of the stuff they say can't be done can be done.They just aren't smart enough to do it properly.

Thats actually very true. They probably arent clever at all, but their personalities fit the job. The team they have are pretty talented though. And plus, Im pretty sure they dont think up the tests; thats what script writers and directors are for :wink:
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