A Dirty Harry-Style .44 Magnum Vs. A Block Of Gel: Who You Got?

Submitted by: fancylad 1 month ago Science


A guy shoots a round into a long block of silicon-like gel -- can any gun experts explain the inner explosion at the :23-second mark? Is that the characteristic of a .44? 
There are 11 comments:
Male 43
there wasn't enough powder residue or grease on the bullet to generate the amount of sooty exhaust that can be seen coming from the gel, so presumably there are some hydrocarbons in the mix; not your normal gelatin ballistic gel.
The explosion would have been caused by compression ignition, when the hole collapsed, just like a diesel engine. 
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Male 1,129
agurney sounds good.  There was a lot of force pushing that bubble of gas closed.  Could have been gas generated from the gel itself too that was combustable.

But what is the point?  that was a long piece of gel!  If a bullet can pass thru two people and pop out the other side (roughly the length of that get), i would classify it as "bad ass"
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Male 1,141
agurney  not shore  about the hydrocarbons and all that but I think your right about the basic cause of the explosion as rapid compression I believe that air will act this way if compressed fast enough and hot enough. It did say that its not ballistic jell but silicone jell which  may explain the explosion as you say as hydrocarbons.
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Male 674
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Male 912
 The block is hit with a bullet, and as the bullet rapidly expands and dumps its energy into the gel, a cavity expands rapidly. During this process, some of the (oil-based) material in the cavity has been vaporized. After the expanded bullet exits (to the right of the gif above but easier to see in the video below), the cavity in the block begins to collapse. The resulting pressure increase appears to ignite the vaporized material, which explodes with a flash followed by some exhaust. 

This from the post at Geekologie that talks about this same film.

http://geekologie.com/2016/11/bullet-causes-mini-explosion-in-ballisti.php
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Male 525
No expert but if I had to venture a guess I would say the rapid compression of the hot air/gas caused it. 

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Female 3,287
dragon91 that was my first thought but if that was shot at close enough range, there could be some powder remnants that pooted out the back end?  I've never used B-gel before.  
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1
.44 mag Glock? Come on dude that's a revolver.
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Male 19,981
ethan_posilkin That was a mistake -- I thought I deleted that. Chalk it up to a really bad hangover.
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Male 54
ethan_posilkin Thats a Smith & Wesson 629 4 inch Glock!!!
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Female 3,287
starzokc assault-glock!
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