World's Largest Horn Shatters Glass

Mark Rober December 23, 2018
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Mark Rober

@markrober

About

Former NASA engineer. Current CrunchLabs founder and friend of science. Answers to some common questions: 1) 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 2) I studied Mechanical Engineering in School. I did my undergrad at BYU and Masters at USC. 3) 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 made some Halloween costumes. Then I worked for Apple in their Special Projects Group doing Product Design as a Mechanical Engineer for 5 years. Then in 2022 I created CrunchLabs to deliver monthly toys that teach you to think like an engineer.

Video Description

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 ****************************************­ I make videos like this once a month all year long while supplies last: CHECK OUT MY CHANNEL: http://tinyurl.com/MarkRober-YouTube FACEBOOK: https://www.facebook.com/MarkRoberYouTube TWITTER: https://twitter.com/#!/MarkRober INSTAGRAM: https://www.instagram.com/markrober/

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