Why Do Boats Make This Shape?
464,395
Published 2021-03-21
This video is about the "Kelvin wake" shape of water wakes behind boats - we talk about mach angle, dispersion, superposition of many waves, and how these all lead to the pattern of a wake. We don't get into Froude number though...
REFERENCES
Boat Wake Wikipedia Page: en.wikipedia.org/wiki/Wake
Interactive Boat Wake Simulation: observablehq.com/@rreusser/dispersion-in-water-sur…
Feynman Lectures on Water Waves: www.feynmanlectures.caltech.edu/I_51.html#Ch51-S4
Building up a Boat Wake from V-Shaped Wakes: editor.p5js.org/aatish/full/bDiykicsC
Wave Dispersion: en.wikipedia.org/wiki/Dispersion_relation
Mach angle shock waves:
www.sciencedirect.com/topics/engineering/mach-angl…
Ship Wakes - Kelvin or Mach Angle? Rabaud and Moisy Paper: journals.aps.org/prl/abstract/10.1103/PhysRevLett.…
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Created by Henry Reich
All Comments (21)
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It’s amazing to see those waves come together to make the recognizable wake pattern. I didn’t know it would be that complicated but it’s really interesting to think about
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Awesome video. Way more complicated than I thought!
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Appreciating the fact that i get content like this for free.
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0:31 "In this video, we are gonna explain exactly where this shit comes from." can't unhear it.
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I just noticed that for some time these videos aren't actually hand drawn like the older ones. It took me a while to notice, which means that you managed to imitate the look quite well, but I miss the drawing a bit.
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Years ago when I was riding a boat, I thought about a way to know the speed of the ship I was riding in. I got the idea because I knew that the angle of the shockwave of a supersonic thing relates to its speed, so I looked outside expecting a fine, singular wave. I got surprised about what I found and asked myself why. Thank you for finally answering this
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Damn, I didn't even notice they all have that pattern. Thanks for making these all contents available for free.
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0:39 this is a bit misleading, because light waves also disperse when not in a vacuum (which is always)
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It's a bit late at night, but they posted, so I'm now a *wake*.
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i love learning things i never knew i wanted to know
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This is so good that I though I should leave a comment to boost engagement
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Lets appreciete the hours of investigating, animating, drawing... all this for free. Thank Minute of Physics
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This definitely not a comment just to boost engagement because I really like this video.
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These are the questions we never ask but definitely need the answers of, and i can understand how amazingly hard it can be for someone to even think of such a question that is original and not already answered from other bigger channels , really great job mate.
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I absolutely love fluid dynamics.
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i really enjoy the pacing in your videos. and going back to put all the components into one concept really makes for a smooth finish. love it
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You do a great job at explaining complicated things in a way that is understandable. Good job!
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This is good stuff. Appreciate your efforts, Henry.
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This is brilliant science communicating: Very interesting topic explained in an engaging way. Thanks, as usual, Henry!
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I appreciate you changing the thumbnail and title to make it more clear what you are explaining here
