Plastic Cup Glass Cone Shaped Charge Explosion

[alternatehistories]

My grandpa told me u could lay a stick of dynamite on the ground...put a sheet of newspaper over it...and it would blow downward - creating a crater. With no newspaper, he said it blow upward..leaving no crater. I still wonder if this is a BS legend...but the way he told it...it sounded possible. Anyone besides me ever heard of the old newspaper over dynamite trick???

[boomboom314159]

@alternatehistories I don't think it would be that big of a difference. Maybe if you put the entire newspaper over it, that would somewhat act like tamping it, and the crater would be a little bigger. Nevertheless, just a stick of dynamite on the ground with nothing over it would still make a crater.

[exenrontexas]

Please buy a tripod.

[x1xNoisEx1x]

it sounds like Your not te only one playing in that area at the same time :D what are the shots in the background :) ??

[bestamerica]

'

i am sure a bigfoot guy heard about a BANG then a bigfoot run to hide in cave

[Nitricthunder]

I would try filling plastic bags with mud or clay, and then duct taping them around the charge to tamp it.

[Northhunt]

0:09 - your neighbours dosent care about your hobby ehh XD

[fly2000jtb]

very cool but where are you that no one hears that boom hahaha very cool video Joseph T fly2000jtb

[vikernespt]

i heard another explosion on the background. crazy neighbourhood!

[shinymarshtop2]

@vikernespt i did too at 1:28 or so

[adriiPortillo]

USE NITROESTERS !!!!!

[ottanicubano88]

About the VOD that decrease the performace of conical shaped charge, maybe the ANNM+H2SO4 is perfect for good result without strong confinement...

however, are still skeptical is such the reason, I will convinced when I will make the test in person with ANFO+AL melted in a steel jar (very thin).

[PoopSwindler]

that was a great test video and it does look like the vod is higher than annm. Maybe you are just getting a more complete detonation with the al and you need a booster to fully detonate the annm. You are probably right. The reason that velocity is so important in shaped charges is related to the kinetic energy equation k=(1/2)MV^2 so the velocity is exponential compared to the mass, this is why even a 20 percent change in vod can crate a 100% more effective charge.

[vvideoupl]

In my opinion the problem was the cup, it is a conical cup and not cylindrical, you made a shaped charge with two cones. Try a PVC pipe with the glass and you will see it working. Anyway, nice detonation.

[PoopSwindler]

having a cylindrical tube is in no way a requirement for a shaped charge, just look at the shaped charge rpg.

[dirtdiggerlee]

That's interesting. I couldn't tell, was there any cavitation spots at all? I also couldn't tell if the cone and standoff were the same as the other glass SC. I would have expected some type of cavitation if the setup was the same other than the confinement. A SC will work with minimal confinement with the right setup but the effect will be somewhat lessened. All though I have to admit that I have never used ANNMAL on any SC, so it's possible that the VOD just isn't high enough. Nice test anyway

[boomboom314159]

Yes, there were cavitation spots, but not in the direct center underneath; kinda off to the side a little. Also, the standoff distance was more on this one because the diameter of the cone touching the explosive was greater. That's why I used the cup, to get a lager area of the cone covered by explosive. But your'e probably right about the VOD.

[hankmanGTA]

I ask as to what resolution to record?

And what a mobile phone you use?

Just for comparison:)

[donnelrj01]

The support the cone has is actually quite important.

[PoopSwindler]

that should have worked. you really dont need a strong conical wall. try it with a faster vod explosive and it sould work fine. I have only experimented with thin paper or plastic tubes and they work fine but i use EGDN and PETN. They have about twice the vod of ANNMAI.

[boomboom314159]

Probably right about that. What do you think the VOD of ANNMAl is anyway?

[PoopSwindler]

ok so i dont know the vod of ANNMAI but I estimated it by extrapolating data from similar explosives. For example ANAL ha a vod of 2700-3000 and ANFO has 3500-4000. Also ANNM has a vod of 6000, so i would expect, using the same proportions, the aluminum added to the ANNM would bring it back to the ANFO range (maby a little higher)

[PoopSwindler]

also pure AN has a vod of 4100

[XBiteABulletX]

@boomboom314159 It's about 6000-7000 m/s