# Cannonball! Why a “Manu Bomb” Makes Such a Huge Splash of Water

**URL:** <https://scanalyst.fourmilab.ch/t/cannonball-why-a-manu-bomb-makes-such-a-huge-splash-of-water/2169>\
**Category:** Tracking with Closeups\
**Tags:** fluid-mechanics, manu-diving, cannonball, worthington-jet, rayleigh-jet\
**Created:** [19 October 2022 10:25 UTC](https://scanalyst.fourmilab.ch/t/cannonball-why-a-manu-bomb-makes-such-a-huge-splash-of-water/2169 "2022-10-19T10:25:48Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![johnwalker](https://scanalyst.fourmilab.ch/user_avatar/scanalyst.fourmilab.ch/johnwalker/32/17415_2.png) [@johnwalker](https://scanalyst.fourmilab.ch/u/johnwalker)\
**Post date:** [19 October 2022 10:25 UTC](https://scanalyst.fourmilab.ch/t/cannonball-why-a-manu-bomb-makes-such-a-huge-splash-of-water/2169/1 "2022-10-19T10:25:48Z")

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[![](https://scanalyst.fourmilab.ch/uploads/default/original/2X/5/5970fa19fdc2b9b5df4437f7e2cf181ef020ffaf.jpeg "How is a Manu Bomb So Powerful?") ](https://www.youtube.com/watch?v=2MJx39QjHqs)

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**Author:** ![CTLaw](https://scanalyst.fourmilab.ch/user_avatar/scanalyst.fourmilab.ch/ctlaw/32/42_2.png) [@CTLaw](https://scanalyst.fourmilab.ch/u/CTLaw)\
**Post date:** [19 October 2022 13:29 UTC](https://scanalyst.fourmilab.ch/t/cannonball-why-a-manu-bomb-makes-such-a-huge-splash-of-water/2169/2 "2022-10-19T13:29:23Z")

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His water jet experiment reminds me of a shaped charge:

[![](https://scanalyst.fourmilab.ch/uploads/default/original/2X/2/23c2fb61430f447f25d295d4e3506fe470a79d89.jpeg "HOW A TINY PIECE OF PLASTIC HELPS DESTROY TANKS | Shaped Charge Armour Piercing Simulation") ](https://www.youtube.com/watch?v=KMLye177nqo)

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**Author:** ![johnwalker](https://scanalyst.fourmilab.ch/user_avatar/scanalyst.fourmilab.ch/johnwalker/32/17415_2.png) [@johnwalker](https://scanalyst.fourmilab.ch/u/johnwalker)\
**Post date:** [19 October 2022 14:13 UTC](https://scanalyst.fourmilab.ch/t/cannonball-why-a-manu-bomb-makes-such-a-huge-splash-of-water/2169/3 "2022-10-19T14:13:52Z")

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> [@CTLaw](#):
>
> His water jet experiment reminds me of a shaped charge

I was thinking of the process believed to cause the formation of [central peaks](https://en.wikipedia.org/wiki/Complex_crater#Central-peak_craters) in impact craters on planets and moons.

[![](https://scanalyst.fourmilab.ch/uploads/default/original/2X/c/cc992c4ca5b2ada99b21a0e08f988ec6125e9fa0.jpeg "Central Peak Crater Formation") ](https://www.youtube.com/watch?v=g6v5xkgh3Z4)