video thumbnail 9:16
World's Largest Horn Shatters Glass

2018-11-28

[public] 37.9M views, 957K likes, 25.7K dislikes audio only

channel thumbMark Rober

I might upgrade my car horn to this.

Watch the What's Inside video here: https://youtu.be/d9tA1icDPGY

Here is a behind the scenes video from the day: https://www.youtube.com/watch?v=rJIc1iAQdPw

ELI20 version: I answered why you want a large outlet area but not necessarily why it curves like that. Anytime you have a sudden change in cross-sectional area in the horn you will get waves reflecting back at the source. You don't want that because that is wasted energy that could have moved forward. Even if it goes from a small cross-section to a larger, if you do it suddenly you get those wasted waves. So you want the horn to basically be asymptotic at the exit so you never have a jump in discontinuity when it exits to the wide open air. So a directors cone isn't as good as the curved shapes I showed because it still has the sudden change when it dumps into the open air.

MUSIC-

0:10- Arrow- Andrew Applepie - http://andrewapplepie.com/

1:08- Dance- Danijel Zambo- https://danijel-zambo.bandcamp.com/

2:00- Kalimba Jam- Blue Wednesday - https://soundcloud.com/bluewednesday/

3:00- New shoes- Blue Wednesday - https://soundcloud.com/bluewednesday/

7:30- Ceral Killa- Blue Wednesday - https://soundcloud.com/bluewednesday/

8:47- Q- Blue Wednesday - https://soundcloud.com/bluewednesday/

9:46 Too Happy to be cool by Notebreak- https://soundcloud.com/notebreak/dubstep-too-happy-to-be-cool

Summary: I made a huge horn and broke glass with it and explored why horns are shaped the way they are.

MERCH-

They are soft- https://teespring.com/stores/markrober

PLEASE CONSIDER SUBSCRIBING: http://tinyurl.com/MarkRober-Sub

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What's inside an Air Raid Siren? by What's Inside?
youtube.com/watch?v=d9tA1icDPGY
Arrow- Andrew Applepie
/youtube/video/pFEB0chiuJA?t=10
Dance- Danijel Zambo
/youtube/video/pFEB0chiuJA?t=68
Kalimba Jam- Blue Wednesday
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New shoes- Blue Wednesday
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Ceral Killa- Blue Wednesday
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Q- Blue Wednesday
/youtube/video/pFEB0chiuJA?t=527
Mark Rober Former NASA and Apple engineer. Current YouTuber and friend of science. Answers to some common questions: 1) I studied Mechanical Engineering in School. I did my undergrad at BYU and Masters at USC. 2) I worked for NASA JPL for 9 years, 7 of which were working on the Curiosity Rover (I made a video about it you should def totes watch cause it's probably my favorite of all my videos). Then I created Digital Dudz (made some videos about this too) and eventually sold it after 2 years. Then I worked for Apple in their Special Projects Group doing Product Design as a Mechanical Engineer for 5 years. As of 2019, I just make my monthly YouTube videos. 3) Link to free and therefore substandard build plans for my custom workbench can be found below. 4) I make a monthly toy we build together on a video, that gets delivered to your house that teaches you to think like an engineer. Check it out at- https://crunchlabs.com/MarkRober
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