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| Backyard Ballistics This forum is dedicated to the safe teaching and responsible handling of high and low explosives. You will not find any information on how to make "bombs" or any such device(s) . Backyard ballistics will teach you the science and the art of pyrotechnics and how to manufacture and use explosives/pyrotechnics safely and responsibly. Backyard ballistics is also a haven for rocketry and pneumatic cannons. All information contained within this forum is for educational purposes ONLY. Totse does not accept responsiblity for any incident involving the use of the information contained within this forum. |
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#1
 2002-02-17, 20:22
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dood44 
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shrapnelless
Is there anyway you could make somthing with the power of a cratermaker but no shrapnel?Maybe with bp too
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#2
 2002-02-17, 23:02
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Rat_Bastard 
Regular
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Re: shrapnelless
sort of.... Try a SIDE FUZED cratermaker, there is less, if not, no shrapnel at all (But still use common sence and, be cautious).
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#3
 2002-02-17, 23:05
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Moderator
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directly over the center of th
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Re: shrapnelless
that would work but why not just use somthin like a thick bit of cardboard tubing ?? wouldent that work way better rat ? oh and congrads on your "KEWL" ratings site i love it man keep up the good work
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#4
 2002-02-17, 23:59
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dood44 
Regular
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Re: shrapnelless
Would a 4 inch long,1 1/4 wide and a wall thickness of a little less than 1/4 inch work? Thanks
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#5
 2002-02-18, 00:03
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dood44 
Regular
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Re: shrapnelless
Cardboard tube I mean
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#6
 2002-02-18, 00:10
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Infestation 
Regular
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Re: shrapnelless
explosions are generally caused by a sudden expansion of gas creating too much pressure for its container and bursting it. with low explosives (e.g. black powder) if the burning is uncontained then there is not an explosion as such, just burning. this is why model rocket engines dont explode but thrust. if you put it in the cardboard tube, i assume the the pressure needed to burst the tube would be so small that you would most likely get a thrust effect from the bp, rather than the explosive effect you are going for. so no, i dont think cardboard tubing would work. following rat's method is your best chance of success i think
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#7
 2002-02-18, 00:11
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Infestation 
Regular
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Re: shrapnelless
i say this because even though thick cardboard is strong, even 1/4 inch thick cardboard, i have yet to shoot through and empty CO2 canister with my air pistol... and believe me ive tried.
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#8
 2002-02-18, 01:32
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Moderator
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directly over the center of th
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Re: shrapnelless
yeah but in a rocket engine that powder is a solid chunck so its just one big grain of gun powder it burns slowly and the burning gases are shot through a nozzle creating thrust
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#9
 2002-02-18, 01:35
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Moderator
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directly over the center of th
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Re: shrapnelless
quote: Originally posted by dood44: Would a 4 inch long,1 1/4 wide and a wall thickness of a little less than 1/4 inch work? Thanks
it would work just not veary great there is a old trick i found and that is to wrap that tube in string and cover with epoxy then allow to dry then repeat about 3 times so you have about 4 layers of this stuff then you have a really strong basically M-80
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#10
 2002-02-18, 05:12
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Zero the Inestimable 
Regular
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Re: shrapnelless
Heavy cardboard containers will make a good bang, but are lighter on the damage than metal.
~Zero the Inestimable
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#11
 2002-02-18, 17:55
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Infestation 
Regular
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Re: shrapnelless
whenever i try bp in a cardboard tube even after i have ball milled it i always end up getting a thrust out of where the fuse was.... even if i use a side fuse this happens... any suggestions?
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#12
 2002-02-18, 19:36
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groundcontrol 
Regular
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Re: shrapnelless
smaller fuse hole and glue maybe, no sarcasm intended
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#13
 2002-02-18, 20:47
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Moderator
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directly over the center of th
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Re: shrapnelless
hummm weird i have never had one go off like a engine
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#14
 2002-02-19, 01:10
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Zero the Inestimable 
Regular
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Re: shrapnelless
Your powder sucks.
You do know that you have to press and grind it after you mill it, yes?
(Edit - Now THAT was an interesting typo.)
~Zero the Inestimable
[This message has been edited by Zero the Inestimable (edited 02-19-2002).]
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#15
 2002-02-19, 20:34
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Infestation 
Regular
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Re: shrapnelless
quote: Originally posted by Zero the Inestimable: Your powder sucks.
Do do know that you have to press and grind it after you mill it, yes?
~Zero the Inestimable
dammit!
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