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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 
Old 2008-03-07, 01:28
Drewski Drewski is offline
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Default Homemade "M80"

http://www.youtube.com/watch?v=Df5MoZCf6W0

This was an explosive, homemade by a friend of mine. This is on new years. The funny thing is how small the tube was and how little it was filled. This is actually a smaller one, but the only one on film. Pause it at the explosion too, funny shit.
 #2 
Old 2008-03-07, 02:37
asilentbob asilentbob is offline
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Default Re: Homemade "M80"

If only there was a way I could make you guys understand...
 #3 
Old 2008-03-07, 06:09
MH-iforgotmypassword MH-iforgotmypassword is offline
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Default Re: Homemade "M80"

As much as I just want to ignore you for being an idiot, the freeze-frame was pretty cool.
 #4 
Old 2008-03-07, 06:33
Regular
 
Queensland Australia
Default Re: Homemade "M80"

Lol Kewl Dood You Made A Bang
 #5 
Old 2008-03-07, 11:51
Moderator
 
I live in Heresy
Default Re: Homemade "M80"

You're not supposed to completely fill the tube. Leaving 40%-60% empty will increase performance significantly.
 #6 
Old 2008-03-07, 14:23
Drewski Drewski is offline
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Default Re: Homemade "M80"

Quote:
Originally Posted by Mokothar
You're not supposed to completely fill the tube. Leaving 40%-60% empty will increase performance significantly.


I'd assume that's what he did then, I'll ask today, as well as what he made it with.




He's the one that knows his shit, not me. So if it seems like I have no knowledge of explosives, that's because I don't. I'm not the one that made it.
 #7 
Old 2008-03-10, 08:37
dawn_of_devastation dawn_of_devastation is offline
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Default Re: Homemade "M80"

I can verify that the tube was filled with exactly 3g of a ratio of 7:3 Potassium Perchlorate to 3500mesh Aluminum powder. I may or may not be the friend in discussion and fuck you guys who are likely only bitching because it's the fucking suburbs and there's LULZ in the video. Isn't that what this hobby is about?
 #8 
Old 2008-03-10, 17:37
Moderator
 
mah compound
Default Re: Homemade "M80"

Quote:
Originally Posted by dawn_of_devastation
I can verify that the tube was filled with exactly 3g of a ratio of 7:3 Potassium Perchlorate to 3500mesh Aluminum powder. I may or may not be the friend in discussion and fuck you guys who are likely only bitching because it's the fucking suburbs and there's LULZ in the video. Isn't that what this hobby is about?



It's not about the lulz fag, and setting off explosive devices in a residential area is fucking stupid.
 #9 
Old 2008-03-10, 20:56
asilentbob asilentbob is offline
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Default Re: Homemade "M80"

3500 mesh...

Ha... Haha... HAHahahhahahahhahahhahahhahahahhahahahhahaa
 #10 
Old 2008-03-10, 21:20
Moderator
 
mah compound
Default Re: Homemade "M80"

lol i didnt catch that, maybe he meant 350
 #11 
Old 2008-03-10, 22:21
Moderator
 
I live in Heresy
Default Re: Homemade "M80"

You know there is 3500 mesh Al ... I hear it makes your lungs all sparkly!
 #12 
Old 2008-03-10, 23:35
Moderator
 
Professional Bastard
Default Re: Homemade "M80"

Probably wafts directly through the filters in cheaper respirators, too. Isn't cigarette smoke 4800 mesh or so?
 #13 
Old 2008-03-11, 02:03
asilentbob asilentbob is offline
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Default Re: Homemade "M80"

You can't have wires fine enough to make much finer than 400mesh... being why very fine particle sizes are always measured with microns. The conversion back and forth isn't set either so saying -325 mesh doesn't mean much... though you have a general size breakdown with micron, being about 44micron and below...

To show the uncertainty of mesh:
One site reported:
White blood cells are about 25 microns.
Red blood cells about 8 microns

Another reported:
Red blood cells about 12 micron saying this would be around theoretically 1200mesh...

mesh / inches / micron / example
14 4.056 1400 28 0.028 700 Beach sand
60 0.0098 250 Fine sand
100 0.0059 150
200 0.0030 74 Portland cement
325 0.0017 44 Silt
400 0.0015 37 Plant Pollen
(1200) 0.0005 12 Red Blood Cell
(2400) 0.0002 6
(4800) 0.0001 2 Cigarette smoke
* The mesh numbers in parentheses are too small to exist as actual screen sizes; they are estimated and included just for reference
http://www.colonialvirginiahpr.org/Experimental/meshmicron.htm
 #14 
Old 2008-03-11, 05:46
dawn_of_devastation dawn_of_devastation is offline
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Default Re: Homemade "M80"

It wasn't 350 mesh, but I'm doubting it's 3500 either. The shit was extremely dangerous when airborne and i would almost consider it as fine as cigarette smoke (A t-shirt wouldn't cut it).

Anyway I can't believe how fucking condescending you fags can be. It was a small salute and it was on New Years for christ's sakes.
 #15 
Old 2008-03-11, 06:04
asilentbob asilentbob is offline
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Default Re: Homemade "M80"

If you think for one second a t-shirt will cut it when messing with ANY pyro chems your sadly mistaken.

Stick around and learn some. It could save your life.
 #16 
Old 2008-03-13, 23:04
Moderator
 
I live in Heresy
Default Re: Homemade "M80"

Anyway I can't believe how fucking condescending you fags can be. It was a small salute and it was on New Years for christ's sakes.

Yeah, people who've been 'round the blocl a couple of times tend to be like that.

It's not that we don't like you, you remind of the person we hate, the one we once were :p
And fucks like that must go!
 #17 
Old 2008-03-20, 03:02
pyrovision pyrovision is offline
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Default Re: Homemade "M80"

I guarantee you that they were all safely performed using low explosives and all precautions were taken (including checking for moving vehicles and well beyond minimum safe distance of all structures and persons). Noone was injured, and PWAU know what they're doing, lighten up...
 #18 
Old 2008-03-20, 09:02
asilentbob asilentbob is offline
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Default Re: Homemade "M80"

If you still get your kicks off small salutes, then no, you don't really know what your doing. Trust me.
 #19 
Old 2008-03-20, 20:56
pyrovision pyrovision is offline
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Default Re: Homemade "M80"

We're not going to detonate high explosives in a residential area, that's idiotic. Again, we know what we're doing...
 #20 
Old 2008-03-22, 01:40
Moderator
 
Professional Bastard
Default Re: Homemade "M80"

Quote:
Originally Posted by asilentbob
If you still get your kicks off small salutes, then no, you don't really know what your doing. Trust me.


That's a total non-sequitur. You can still know what you're doing and have fun with small low explosive salutes. "Boom! That was fun," etc. That's the point.

You paint with too broad a brush. Just because someone isn't doing something your elitism complex doesn't allow you to enjoy anymore doesn't automatically mean they (or their friends) are in any way stupid or "don't know what they're doing."

So lighten the fuck up.
 #21 
Old 2008-03-24, 08:13
Chainhit Chainhit is offline
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Default Re: Homemade "M80"

*used to throw bags of flash powder out the window of apartament building in NYC, and set off cobs in my friends yard, also in NYC*
And I agree with you guys being dickheads, small loud explosives are great (Even better if they explode high in the air)
the elitism is overwhelming. so is the paranoia. IF he took it safe, then its fine. He seems to have taken percuasions beyond a reasonable doubt, so whats wrong with it? the worst he will do is deny someone their beauty sleep.
 #22 
Old 2008-03-24, 08:18
Chainhit Chainhit is offline
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Default Re: Homemade "M80"

We're not going to detonate high explosives in a residential area, that's idiotic.

Thats what you think :D
 #23 
Old 2008-03-24, 14:35
Moderator
 
I live in Heresy
Default Re: Homemade "M80"

Thats what you think :D

To hell chainhit!
Ever since redsky did it, we're condemning it!

...

there's probably some other reason too
 #24 
Old 2008-03-25, 05:25
Moderator
 
mah compound
Default Re: Homemade "M80"

To hell chainhit!
Ever since redsky did it, we're condemning it!

...

there's probably some other reason too


Scaring people? Drawing unwanted attention? Giving pyros in general a bad name? General safety?


It's scary as fuck to have a device buried and lit only to have some random idiot walk by out of nowhere and walk up to investigate the smoke coming from out of the ground, and you have to scream GTF BACK NIGGER! And then pray he doesn't call the cops after that huge WHUMP!.
 #25 
Old 2008-03-26, 07:55
Chainhit Chainhit is offline
Regular
 
Default Re: Homemade "M80"

using fuses around people is fucking stupid, you wanna be in control during those situations, 100%
especially when you dont wanna be close to the thing your setting off
 
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