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WATCH: What Happens When a Bullet Hits an 'unbreakable' Prince Rupert's Drop

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This is way cool...

 

For those of you who aren't familiar with the Prince Rupert's drop, this weird, scientific enigma is a glass object that's created by dripping molten glass into very cold water.

 

http://www.sciencealert.com/watch-what-happens-when-a-bullet-hits-an-unbreakable-prince-rupert-s-drop

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I wish he'd taken measurements of that one near perfectly straight drop. I want to calculate the speed of the shockwave as it travels through the drop.

 

SCIENCE TIME!

 

Observation:

shockwave appears to traverse length of drop at least 5x as fast as bullet fragments.

 

Estimates:

speed of average .22lr LRN 40gr bullet: 1100fps

equivalent length of Drop is approximately 2 bullet lengths inside of barrel from muzzle

 

Emperical data from video (time codes):

0.542ms bullet appears

0.604ms travel 1 bullet length

0.989ms bullet impact

1.031ms break wave start

1.135ms break wave end

 

Computed data:

0.062ms per bullet length

0.571ms bullet transit time (with 2 extra lengths)

0.042ms shock wave duration

0.104ms break wave duration

 

Since the length of the Drop and the distance traveled by the bullet are the same, they are factored out.

As such, the relationship of our velocities of bullet and break wave or shock wave, are directly related to time.

We therefore get estimates of:

break wave velocity of 6,039 fps

shock wave velocity of 14,955 fps

Prince Rupert Drop length: 7.5"

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I wish he'd taken measurements of that one near perfectly straight drop. I want to calculate the speed of the shockwave as it travels through the drop.

 

SCIENCE TIME!

 

8d535cb0895693c4ac4e226d66dfd145_revenge
says a star wars fan

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