How Did She Rip Her Bottom On This Rock?

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View the director's commentary of this video here: / 77139424
✩ABOUT THIS VIDEO✩
In this video, we investigate the effect of squat and see how it can mean that ships hit rocks deeper than their own draft. We use the example of the QE2, which struck an uncharted shoal after experiencing squat.
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30 май 2024

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Комментарии : 668

@dictolory Год назад

Imagine having the balls to floor a newly built ship under a bridge that it doesn't fit under.

@chrisb9143 Год назад

You missed the best part when you have to explain that in order for it to work the ship must be at full speed

@casey6556 Год назад

It’s like those videos of people trying to get trucks under bridges they’re too tall for except because of hydrodynamics it actually works LOL

@Caktusdud. Год назад

@@casey6556 wait how does this work. What's it called so I can have a look at this?

@brunoraoni Год назад

@@casey6556 It can work on those trucks too... technically... assuming you could generate enough downforce to fully compress the shock absorbers in the truck's suspension...

@wbedard Год назад

That's very similar to how Formula race cars have to drive fast enough to generate enough down-force to keep them stuck to the road around corners. If they don't drive fast enough, they'll skid off the road.

@andylane7142 Год назад

Holy crap, just built a 1 billion $ boat, put the last touch of paint on it then drive it at full speed toward a bridge with a physicist telling you not to worry, it will sink down in the water due to Bernoulli’s principle. Thats a butt clenching moment if ever I heard of one.

@ethribin4188 Год назад

The magic of physics :D

@pendlera2959 Год назад

I mean, if you're going to do anything with giant ships, you need a lot of trust in physicists already.

@NeatNit Год назад

@BOB K In what scenario would the choice be between those?

@jemmabean Год назад

@BOB K I'd trust a pharmaceutical scientist over a physicist if what we were talking about was pharmaceutical science and not physics.

@kirkhamandy Год назад

@@NeatNit The difference is between Dr. Fauci's blue pill and Dr. Who's red pill 😂

@GiovanniRuffinengo Год назад

"Captain, there is a bridge ahead and we are too tall! " "Faster goddamnit! I said FASTER"

@accountxabcdef Год назад

we missed you in the "Nord-Ostsee-Kanal" (North-Balticsea-Canal?).

@pan2aja Год назад

Bridge to engineering "give me all you got, more speed !! "

@SnoopyDoofie Год назад

Kirk - "Full speed ahead Mr. Chekov"

@indridcold8433 Год назад

I'm sorry captain! I'm giving you all she's got. I can give you no more! The engines are already at 120% capacity. I do not know how much longer she can take.

@dessmith7658 Год назад

More passengers

@rrad8106 Год назад

I lived here during that event. I LOVED the anecdotal interviews following: Nervous passenger to the Captain, "Captain, should we abandon the ship?" Captain, "My dear, we are already on the bottom! Go back and have another glass of Champaign!"

@LetoDK Год назад

*champagne

@LeDerpLegend Год назад

@@LetoDK who cares?

@refindoazhar1507 Год назад

@@LeDerpLegend obviously he cares

@janniecombrinkza Год назад

Can you imagine the bullets being sweat in that bridge? And ON the bridge!?

@NeatNit Год назад

@LeDerpLegend We're just sharing knowledge here. It's not "lol how stupid are you, it's spelled champagne", it's "thank you for sharing, by the way the correct spelling is champagne - common mistake, just thought I'd let you know"

@CaptainAndreas Год назад

Being a Captain and active in the Maritime Industry for more than 20 years, all I can say is that your videos should be teaching material. Congratulations!

@seanworkman431 Год назад

I have used the effect to my advantage but did not know what it was called, I agree these are very educational because I only heard mention of, what we called, pressure effect once during my maritime studies. A captain, later harbour master and then lecturer talked of a US aircraft carrier approaching the east coast of Australia crossed the continental shelf into shallower water but still deep by any standard but she squatted and flooded through open portals aft and several sailors perished but the portals were 10m above waterline. So at speed , the depth changed from about 2000m to 250m, interesting story.

@daftbence Год назад

They are. You can buy the vids without ads on their page or order custom videos, for educational purposes.

@naerbo19 Год назад

He has mentioned it a while back that his videos were used as professional teaching materials. If I'm not mistaken, it was in multiple countries.

@917_Bror Год назад

I actually took a course where they used some of the videos as material

@warpet2011 Год назад

I don’t know squat about ships.

@Fanny-Fanny Год назад

I once ripped my bottom on a rock...

@RNG-999 Год назад

You're also named Fanny

@Tom_Samad Год назад

I actually felt the pain from reading your comment!

@TheTiredPhrog Год назад

Same 😞

@Fanny-Fanny Год назад

@@RNG-999 well, I'm glad I'm not British then, as a ripped fanny is much worse there than here...

@victorianmagnet9308 Год назад

I thought I had everybody on my side. But I went and blew it all sky high. And now she won’t even spare a passing glance. All just because I ripped my pants.

@welbhloud Год назад

As a seaman on a small ferry, I can see that every time we are about to land. As we slow down, the bow comes up from the water.

@sethtothemax Год назад

Ships have ground effect. Fascinating.ships and planes have so much in common

@MisterLongShot_Official Год назад

Air also acts as a fluid. Other than compressibility they're very similar

@boldCactuslad Год назад

@@MisterLongShot_Official yeah its often said that air is a fluid. engineers i have met take that saying literally and would probably win in any argument

@efthymis_mc3474 Год назад

Isn't what he described more like the ground effect that refers to cars?

@a7iicus448 Год назад

@@efthymis_mc3474 both, the ground effect of a car, the ground effect of a low flying plane and the squat of a ship are all caused by Bernoulli's principle

@ddegn Год назад

@@boldCactuslad "its often said that air is a fluid" FWIW, By definition, gases and liquids are fluids. Fluids flow. In everyday language we tend to use fluid to describe liquids more than we use it to describe gases. In scientific and industrial communications a fluid is just as likely to refer to a gas as refer to a liquid.

@Tjita1 Год назад

A tiny correction is that Oasis of the Seas didn't squat under a bridge over a river, but rather over the Great Belt strait in Denmark. She has telescoping funnels, and would have cleared the bridge by about a foot, but she barrelled at it at 23 knots, and thus gained another foot from squat. Still, 2 feet of clearance at 23 knots in a brand new ship, biggest in the world, under one of the most heavily trafficked car + train bridges in Europe, that must be a proper pucker event..

@XPLAlN Год назад

...thanks. I imagine such an undertaking required detail planning including such as wind and temperature limits, sea state and traffic control.

@Tjita1 Год назад

@@XPLAlN ..had a headwind, and burned a few thousand gallons more fuel than expected, oups, hit the bridge...

@FluppiLP Год назад

you have no idea how happy your correct explanation of Bernoulli's principle at 2:49 made me :D The fact that you said it occurs simultaneously and not one casues the other made me very happy indeed :D

@Grandmaster-G Год назад

There's so much important information in this one (again), i hope every skipper cruising through a canal knows this stuff... I can picture many situations where people overreact or simply react wrong due to not knowing the physics behind what's happening... oh boy. Thanks !

@Vinemaple Год назад

Yes, squat is taught!

@loosegoose41 Год назад

As a pilot (air, not sea) these sorts of videos are incredibly interesting to see the similarities in air versus water behavior. Thank you for such great content.

@LocoCoyote Год назад

I don't care what anyone may say...these videos are some of the best on YT. I always learn interesting facts and the reasons behind them. Bravo!

@bigdmac33 Год назад

Two things : The QE2 for me will always be one of the most beautiful ship designs ever created, and, this was a superb presentation.

@stephenchappell7512 Год назад

Indeed John Brown Clydebank turned out some beauties including the Queen Mary and the first Queen Elizabeth not to mention the 'mighty' Hood

@naturalroyalflush Год назад

I agree. I sailed on this ship from New York to Southampton. The departure was at full speed because she was outrunning a hurricane. We had a chart up showing where the Titanic sank. We got very close to the spot. It was quite emotional.

@aezravito9717 Год назад

You can't always be too sure or careful. It's amazing just how things can be explained.

@dinky9216 Год назад

A friend of mine was indeed too careful when abseiling, using an excess of safety equipment, and consequently got stuck half way down.

@Nintendo0994 Год назад

Its so cool to see Bernoulli’s principle in use here sucking a ship downward, and also seeing it used in almost the same way to suck race cars closer to the ground to get more grip with ground effects. I love this stuff!

@yankeexpress Год назад

I was Mate this day on a nearby Sea-Land containership as we transited offshore from Boston to New York harbor and heard the VHF traffic on the air. Next day after we docked in Port Elizabeth NJ saw the story and interviews with passengers on TV.

@Runnifier Год назад

As a sailor solo cruising on a sailboat, these videos help me navigate more intelligently and more safely. Thank you. I love your videos!

@Tinhare Год назад

We experience exactly the same thing on our deep drafted narrowboat. Some of the UK canals are quite shallow in places you can be flat out and only be doing half the speed. also you can see the squat as the boat noticably sits lower in the water. we also experience bank effect and have also practiced the Texas chicken, works a treat if the other boater knows about it also, most don't though. Great explanation. I'm surprised the captain chose to go over such a shallow area when deep water was closeby.

@BNuts Год назад

I can't say I expected to hear the words 'chicken' and 'squat' in relation to ships' behaviour , but these are perfect explanations. Obviously things could've gone worse with the _QE2_ , if she'd been sailing somewhere where she could've sunk, considering the damage, but I bet that's a lesson her bridge crew never forgot.

@carpemkarzi Год назад

Once again a video about something I never knew existed, around a subject I have minimal knowledge and information I doubt I will ever need to know but I am immensely happy that I now know it. Thank you, I love this channel.

@mikesands4681 Год назад

Looks like those navigators didn't know squat! : 🥁

@-Jethro- Год назад

Take your thumbs up and show yourself out.

@JavierCR25 Год назад

I just love this channel so much. You have the ability to transfer knowledge in such a simple and understandable manner!

@CptGiorgis Год назад

Catzoc, ukc calculations and squat explanation all in one video, well explained and tied together. Great job once again!

@Yohann67 Год назад

So what happens if your mega millions ship that doesn’t fit under the bridge suffers an engine failure before it gets to the bridge…..or a loss of steering? Loved this video, I remember people lambasting a couple of captains who hit the bridge…..Why didn’t he slow down? Well now we know. 😮

@xxxggthyf Год назад

Lloyds has a bad day.

@danielkorladis7869 Год назад

A very large insurance claim.

@gus473 Год назад

@@xxxggthyf And the "names" get to pay! 😐 Stiff upper lips, gentlemen. 🧐

@xxxggthyf Год назад

@@gus473 Bloated plutocrats! Capitalist running dogs etc etc etc.

@user-lv7ph7hs7l Год назад

@@danielkorladis7869 Not that large. The funnel would probably get damaged. And maybe the bridge.

@Openbaarmaker Год назад

Ah, man, finally a video i can REALLY relate to! I've been working as a 1st mate on the shallow seas north of The Netherlands and we really had to work with this phenomenon. Excellent video!

@gabelbart Год назад

Watching your videos is always a pleasure. Im always looking forward to your next release. When i discovered your channel in the first place, i binged all your videos. Thank you so much for your excellent work!

@timdavid3574 Год назад

Absolutely some of the best content on YT! I look forward to the next as I continue to review and learn from your previous videos. Bravo Zulu sir.

@ajshell2 Год назад

Fascinating! I had no idea that squat existed. Thank you for teaching me.

@clarencegreen3071 Год назад

I know Newton, Archimedes, and Bernoulli, but now I realize I didn't know squat.

@Vinemaple Год назад

Hey, I get squat for Christmas every year! That was a really cool reflection effect. Nicely done!

@careymcmanus Год назад

I love these videos! I am a software engineer at a company that does under keel clearnace modelling and I did not know anything about how ships work before starting. Your videos give me a much better understanding of what it is that we are modelling.

@trainpuns2 Год назад

Love your videos! Keep up the good work!

@rtbinc2273 Год назад

These are my favorite videos you do. Love this. Thanks so much.

@avramnovorra Год назад

The more i watch these kinds of videos, the more i realize i do not know much about ships.. and i love it

@shanelyon414 Год назад

Great video! Thank you for making navigation fascinating!

@lesleyvids2610 Год назад

One correction: the bridge Oasis of the Sea had to fit under was not a river bridge but the Sorebaeltsbroen, which spans over the sea between Denmark and Sweden

@ryanburningham6952 Год назад

I really enjoyed this video. Thank you for explaining all the various physics involved with speed and distance to the bottom of the sea floor. I had never thought the ship would squat like that in shallow water. Thank you for the content you have, it fills the hole that Modern Marvels left in my soul.

@RandomPlauge Год назад

Thanks for telling me! I never really knew how this worked... at all...

@averagejoey2000 Год назад

we learned about using squat in the safety contour unit of ECDIS Lab this week. what a timely video

@goochfitness26 Год назад

This video was very informative for me personally. I don’t get on boats often but I’m glad I know this 💯💯

@CrankyPantss Год назад

Very interesting, as always. Thanks for sharing this with us.

@TIA910 Год назад

Easy and nice explanation!! Very good work!!

@Robert-nz2qw Год назад

This is more interesting than it should be. Keep it up

@IntrepidMilo Год назад

This video would have been very helpful when I was learning about squat in my general ship knowledge class.

@danihutch Год назад

Excellent video! You explain the physics well...I actually understood!

@ethribin4188 Год назад

I LOVE this kind of physics!!

@Cellottia Год назад

Your videos are so interesting and so clearly explained, and it's very pleasing to learn about the physics involved in ships and boats and seas and canals etc. I'm all for life long learning, and you're a good teacher 😊 so thanks!

@The_Modeling_Underdog Год назад

Loving this series.

@naturalroyalflush Год назад

Fascinating video. The ship passing manoeuvre was very interesting.

@nicopostigo123 Год назад

Awesome explanation! I didn't know about that. Thanks!

@antxi4624 Год назад

Really interested video. I just have one catch, for all of us non American feet are a bit weird. Maybe for next videos you could also says how much is in metric, or at least in the video labels add also the distance in metric

@Cellottia Год назад

(Don't say this loudly, but in the UK, it depends on your age as to whether you understand feet and inches or not.... I remember being at primary school and Miss Broad, our teacher, introduced a new sort of ruler. It wasn't flat as we were used to, and it had lots of smaller divisions on it... She was introducing us to centimeters! This was back in, oh, 1971 or 2, I think. To this day I continue to be more comfortable using feet and inches when I'm measuring up for furniture, or sewing, for example, as it's what my Mum and Dad used at home... Maybe now England's left the EU we'll go back to good old feet and inches, pounds, shillings and pence, and ounces, pounds and stones... 😅 😂😂 🤣🤣🤣!)

@iamgroot4080 Год назад

Another great one, thank You

@sillyoldbastard3280 Год назад

Learnt about squat and this incident when doing my master mariners cert. I am also a mech engineer and had no idea about this effect until my marine studies. Makes perfect sense now

@scomo532 Год назад

I lived in Fairhaven Mass the day QE2 hit the rock. It was a big day for us! We went out and circled the ship in our bass boat to see what was up.

@bananabarman Год назад

Absolute physics nerd, so this is one of my favourite videos to date! 😁

@ascari16 Год назад

Another stunner, cheers

@richarddyasonihc Год назад

Spot on with that one. Apart from having been a Master.Mariner, before I retired, I had wa bespoke Narrow Boat built for cruising the inland waterways. This boat was 62ft long and weighed approximately 22 tons when fully fuelled up and with water tanks full. Passengers along for the ride, used to comment about the way the water level in the canal appeared to drop as we passed at 4 knots, near the bank. A narrowboat is a flat bottomed craft and the effect you mentioned was very much in evidence - I explained that if If I was travelling over. A patch of water which was c shallower than normal, I would slow right down. To many, this seemed n improbable solution - indeed, I came across, & passed boats which had become grounded, simply because they thought that their speed would carry them over. How wrong they were!.

@bobrobertson6514 Год назад

Very well explained.

@TomTom-rh5gk Год назад

I have been saying this for you about the QE2 accident. As a thank you I will like and subscribe.

@DaHitch Год назад

It would be interesting to see a video about the Herald of Free Enterprise disaster and how squat played a role in it.

@davidjordan7964 Год назад

Thanks - not just for this video but for the many others I have seen - this is the least I can do!

@CasualNavigation Год назад

Thank you so much! Its really appreciated!

@shatteredshadow5401 Год назад

"sir we don't have the clearance to leave port, I recommend we deconstruct some of the antennae to make it under the bridge" "Full steam ahead" "What?"

@michaelspring3404 Год назад

good as always

@hazza2247 Год назад

if this guy nonstop pumped out videos i would watch them until i died of dehydration and i’d be fine with it

@sysbofh Год назад

Dying of dehydration while watching videos about ships is pure irony...

@thes7754 Год назад

@@sysbofh i mean he does talk mostly abt salt water vessels

@beardedchimp Год назад

Yes! Several years ago the thought "do ships experience ground effect?" popped into my head. I read into it and found the fascinating Oasis of the Seas example. Though my recollection was that she would have cleared the bridge anyway but the squat increased the safety factor. When this video started I shouted out to my monitor "It's ground effect?!", made me really happy to see I was right.

@adventure_F0x Год назад

Air is just another fluid, it’s not uncommon for aerodynamic testing of components to be done in large water tanks

@dianahowell3423 Год назад

Wow, this was so interesting!

@scotwilliams4789 Год назад

Since I’m a trainee sailor this video will help me emence so thank you verry much

@lakrids-pibe Год назад

*"Oasis of the Seas"* was build in Turku, Finland, in 2009, and she had to sail through danish waters to get from the shipyard in the Baltic Sea to the Atlantic Ocean. She sailed via *Storebælt* - or The Great Belt, to Kattegat and onwards to the North Sea. Storebælt is not a river. The bridge she had to pass under was *Storebæltsbroen* - The Great Belt Bridge.

@samuelmerrill3392 Год назад

One if my favorite days when casual navigation posts something

@LegendaryPatMan Год назад

Well... Today I learned that there are actually vehicles that can generate more Downforce than a Formula 1 car!

@efthymis_mc3474 Год назад

Imagine a ship porpoising

@LegendaryPatMan Год назад

@@efthymis_mc3474 don't give the engineers any funny ideas! Someone gona hire Herman Tilke to come in and design a route into a harbour now with a constantly changing sea bed floor to make ships porpoise

@MattH-wg7ou Год назад

Very interesting. I had no idea, but it makes sense.

@johnbee7729 Год назад

Awesome video

@Kshep84 Год назад

This stuff is so fascinating

@danieljackson654 Год назад

How wonderful is this.

@davidakariverman-astorytel644 Год назад

Thanks, so very much for great discussion of fluid dynamics: Bernoulli principal

@mjiii Год назад

I would prefer these videos without background music, I find it hard to concentrate when there's music playing at the same time. Other than that great video as usual, I love the animations and clear explanations, keep up the good work!

@dogcarman Год назад

Seconded.

@klaernie Год назад

In this video I found it a tad distracting. I don't mind music generally, but I think this specific piece was too exciting.

@tankinator451 Год назад

Imagine being the captain who has to drive a newly built, largest of its kind, billion dollar ship at high speeds at a bridge that it doesn’t fit under relying solely on the fact that it’ll sink a few feet because science. That must be a fun situation to be in.

@thomaskositzki9424 Год назад

So fascinating topics!

@norbertgoulash5482 Год назад

I was on the QE2 in 1982 and she ran aground in Puerto Rico 🇵🇷

@TractorsNStuff Год назад

I watched that video of the cruise ship speeding up to clear the bridge. It was awesome!

@janniecombrinkza Год назад

Thank you thank you I love your videos. Please do one on the sinking of the HMS Birkenhead at Dangerpoint Western Cape. Pretty please!

@Utubin Год назад

Damn,Thank you professor.👏

@jackrichards1863 Год назад

Really interesting. I recall a news article about that ship being sped along it's way towards the bridge which was known to be too low. The reason was not communicated and this left interested parties unimpressed with the reckless path. Days passed without the vessel being seized , no captain arrested , and so on. Most of us think speed only raises a boat . A ship is not a boat however.

@arnoldn2017 Год назад

Once we had a similar issues with a hopper dredge that was damaged by a boulder in the channel while sailing over it during neap tide. After the hulk was repaired in dock we decided to check the squat of this vessel at 10Kts with an UKC of 3 meters . The squat at the stern turned out to be over a meter , the squat at the bow was less

@robinj1052 Год назад

Excellent video again. Basically this is a same effect as the ground effect of an F1 car, resulting in downforce. I assume that this effect is stronger in water than in air due to the differences in density between water and air. Consequently, in water you need less speed to generate this effect. And, of course, ships don't have a suspension to prevent bottoming out 🙂 Even though it sounds a bit counter-intuitively (maybe), at slow speeds, trapping water can also work as cushion. If you berth a large vessel against a closed quay wall, with little under keel clearance and a small berthing angle, the water cannot "escape" quickly enough and will become trapped between the hull and the quay wall, consequently absorbing some of the berthing energy due to compression. This is actually taken into account when designing the fender systems. The reason this works, is because of the low speed and therefor the lack of a low pressure area along the vessels hull.

@stanislavkostarnov2157 Год назад

this sounds like really quite a beautiful use of the principles of math's & physics... but also, like it's an insanely dangerous thing to do... wow!

@subhabratabanerjee4951 Год назад

Nice video, dude... Keep it up...

@MySparkle888 Год назад

I only have a cabin cruiser but I never assume the charts are 100% accurate. The Great Lakes vary so much in depth You could be fine one year but in trouble the next year.

@terryboyer1342 Год назад

My Grandmas house was on the shore of Saginaw Bay. In the 60s you had to walk 1/4 mile to the waters edge. In the 80s it was right up to her door. Then a period of low water again. I'm out of state now but I hear the water is high again.

@crinkly.love-stick Год назад

@terryboyer1342 I'm on south georgian bay (lake huron). Right now, the waters 2-3' lower than it was just 6 months ago. In 2021, it was around 5' higher than it should've been.

@SeanMather Год назад

On top of that there’s been times where the change happens over a matter of days too, so one time you go up the water is high, you come back a few weeks later and it’s dropped substantially. Rarer but wild to see.

@terryboyer1342 Год назад

@@crinkly.love-stick Always wanted to visit your area and backpack in Bruce but it never worked out. My loss as it seems crazy beautiful from pictures.

@terryboyer1342 Год назад

@@satunnainenkatselija4478 That crossed my mind too.

@Themarriedbachelor Год назад

Informative thanks

@mellissadalby1402 Год назад

Yet another cool video.

@NineSun001 Год назад

"Captain we are to high are going to hit that bridge!" "FULL STEAM AHEAD!"

@vf12497439 Год назад

I remember standing along the Columbia River when a Naval ship was running up river. I don’t know what the name of the vessel was but it was a destroyer, escort or a battle ship of some kind. Had large gun batteries forward and aft. Anyway since I don’t have the cool details I did notice as it was approaching the river level dropped a foot or two like the tide went out. This is a huge river that’s a mile wide where I was give or take. After it passed it was like the tide came in and the river level was 2 feet higher than it originally started. From my uneducated observation that in a river system the vessel had to be running in less water depth than any channel sounding since it was moving MASSIVE amounts of water just from its propeller wash. I’m sure other factors of displacement ect ect were part of the effect. I had never experienced that before. It was amazing to experience in person.

@Roytulin Год назад

Ooo this is like the Ground Effect but for ships and produces the opposite effect. Interesting.

@Redbuild_ Год назад

6:33 Thank you so much!

@Redbuild_ Год назад

@jaysonlima7196 Год назад

I was fishing the south side of Sow and Pigs Reef off Cutty Hunk when that happened, didn't look like much from where I was, looked like she just slowed down. And then they radioed the USGC and said that they stuck "something"

@Alan_Hans__ Год назад

I now know the reasoning behind something that occurs on land. The 8'10 bridge has too many moving vans where the drivers are expecting squat and aren't traveling fast enough to get under the bridge ;) This is the first time that I've ever heard about squat in a boat. As a captain of a large cruise ship they should have been well aware. 10% is nothing like the squat of up to 8ft that you mentioned.