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Old February 6, 2019, 01:48 PM   #1
Pond, James Pond
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What’s happening here?

I’ve seen enough ballistic gel videos in slo-mo to know that this is not normal.

What is the explosion after the bullets exist.

Any thoughts as to the cause?
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Old February 6, 2019, 05:40 PM   #2
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Old February 6, 2019, 05:50 PM   #3
Pond, James Pond
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OK. I'll try but basically it's a 7 sec slo mo vid of a HV bullet hit what looks to be 18" of ballistic gel.

It does a straight pass-through length-wise and as the bullet tumbles out of the other end, there is a flash in the temporary cavity which is clearly a small explosion to the point that when the cavity collapses again, grey smoke is expelled from the entry point!
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Old February 7, 2019, 12:50 AM   #4
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I've seen that in a few gel videos.

When the gelatin collapses, the air inside the cavity is compressed extremely rapidly. When you very rapidly compress air in the presence of anything that is remotely flammable, the heat generated can rise to the point of causing the air/fuel mixture to burn.

Here's a good example of it:

https://www.youtube.com/watch?v=fX4ODh1g4eM
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Old Yesterday, 01:57 PM   #5
F. Guffey
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Quote:
When you very rapidly compress air in the presence of anything that is remotely flammable,
Things have changed, there was a time when atmosphere was compressed moisture became visible. Some of the most interesting effects I have seen came off the end of propellers in what looked like a screw effect on humid days.

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Old Yesterday, 02:00 PM   #6
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And then there was one of the most interesting pictures ever taken; it took years to be appreciated in the gun world but it won a prize in the world of art.

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