Spark Plug vs Car Window at 800,000FPS! - The Slow Mo Guys

In the slowest Slow Mo Guys video yet, Gav whips out the newest Phantom to show the mesmerizing paths a crack takes through glass at a whopping 800,000FPS.

[theslowmoguys]

Dan still unable to come and film due to travel restrictions. As you know he's been working for several months on digging a tunnel between the UK and Texas. Progress is going well. Some fishing ships have claimed to see a small Dan sized lump under the ocean a few hundred miles off the east coast of the USA .

[smartereveryday]

Cough* cough* (starts engineering feverishly)

[talyrath]

"And make sure you stay subscribed"

Gav just acknowledges the fact that everyone on YouTube is already subscribed to his channel.

[padraicoregan]

I have never heard a more perfect way to describe how just insanely fast cracking glass is. 'this camera just took 4 Million pictures, the glass is cracking in 145 of them'. REALLY puts it into perspective

[michael_bullard]

“I was waiting…”
*Everyone gets ready for Dan to walk in*
“For a new Phantom to be invented”
Cool but also

[ryancohen]

In 50 years:
"Hello the Internet, I'm Gav, and today we're going to be looking at a black hole forming in 64k at 1 billion frames per second"

[thatspookyMisfit]

over 10 years of Slow Mo Guys, and a *unit* of a camera like this exists
imagine what might exist in another decade...

[Rambit]

"Hi I'm Gav"
"Silence"
*cries*

[Jogwheel]

This is just incredible. What a unique perspective. The math and speed of it all blows my mind...

[MichaelJONeill]

“Of around the 4 MILLION frames the camera just took, the glass crack only took 145 frames to travel across” THAT IS NUTS!

[duncanelms]

The fact he held onto a prop while waiting for new technology to be invented deserves to be commended

[xenyan]

7:56
The way it just stops and slows down gives me massive final boss vibes

[TheHoldfast]

I love how you can literally follow the cracks as they are made. Also, love the nod to Destin :D

[HerculePyro]

One day we need to have gav say "Guys, it's finally happened. travel restrictions have lifted somewhat and Dan is here!" And meg walks in in a Dan cosplay and they spend the entire thing pretending that she is Dan.

[bgezal]

"This thing is bonkers"
I dare Phantom to put that quote on the product page.

[Zappygunshot]

At 3:03 flipping between the frames where the spark plug impacts, you can see that while the plug itself moves across less than a full pixel, the cracks in the glass are already propagating so fast that the latter frame they're already about the width of the plug away from the point of impact. It never ceases to astound me how fast glass breaks, it's mesmerising and mind boggling in such a beautiful way.

Edit: to put it into numbers, between 6:09 and 6:13 the crack moves from about 2/3rds of the way across the frame at 12:10:12.822308.86 to the left edge at 12:10:12.822504.86, meaning it propagated across that distance (which looks to be a few cm) over the span of 296μs, or about 67-100 times faster than chemical signals racing through your neurons to process sensory information (which takes about 20-30ms).
In other words, the time between the first photons carrying information about the fact that a large pane of glass is breaking hitting your retina and your brain having turned that into a single frame image, the crack will have advanced by at least 30 meters - and that is before you've started thinking about what that new information means. Granted, the paper I found doesn't specify what kind of glass they used, but at room temperature the speeds at which most kinds of glass break aren't going to be significantly different.

Sources:

[quackhell]

I love how much Gavin still has so much joy and wonder at the tech pushing the boundaries and delivering even more amazing footage than ever before. Really makes you appreciate the art when the artist is this passionate.

[Holmesy]

Can we get slow mo of Dan's face when he first emerges from his tunnel?

[TheDragonaf]

It would be interesting to see all of the phantoms film the same thing and have a side by side comparison.

[spamreciever]

The wild part of the last one to me is how little of the glass bounced back up
you can see the kinetic energy almost entirely get transferred from the downward movement of the glass into the shattering of the glass