Thanks again for the amazing response to this video. Just to clarify a few things that have come up a lot in the comments. The centre of gravity and the centre of buoyancy are the correct way round in this video. Check out one of my earlier videos too see how it works: th-cam.com/video/DPV_VjzU9kE/w-d-xo.html The stabilisers are a little confusing in the animation. They do twist rather than flap up and down. I struggled to animate the twisting motion when viewed from ahead so exaggerated the up and down element instead. Apologies for any confusion caused.
Id bet that if the stabilizer fin was twice the length it would operate at half the minimum speed. In the end it's just a wing and identical in function to an airplane's. It's the same fluid dynamics.
Thanks for the great video! If I may point out a very minor omission though, I think gyroscopic stabilisers deserved a mention. Albeit now mainly used in yachts, enormous gyroscopes were in fact installed on the transatlantic liner ‘Conte di Savoia’ in 1932.
Yea man I'm drunk asf sailing my big ass ship and my boat flips and I fall in the ocean ya know like we all can relate now I got my stabilizers I'm totally not tired asf and trying to find nun to fall asleep to
In my life on the other hand I can remember my last "ride" on the North Sea with those stabilizers at work. Little foaming waves you didn't even see, though seemingly the ship's stabilizers had problems with those. Result, the ship rolling heavily from one side to another, each time being abruptly stopped in its roll by the stabilizers . Very unpleasant. In the souvenir the floor was littered with items which had flown from the shelves and a fridge on wheels was rolling freely through the restaurant. We arrived with a 4 hours delay.
I watch so many educational videos on subjects that have no relation to my life it’s almost funny. A ‘for instance’ I live in Utah in the USA, one of the driest places in the country, I’ve never even touched the controls of a boat, but still this video has gotten me thinking about how these systems work; also fluid dynamics apply to air, and boy do we have plenty of room to fly things here :). I wonder if any form of passive control could be created for air flight stabilization from wind ....? Great video! I love learning from creators like this, those who even if they are very understated in their tone, clearly convey the breadth of knowledge they carry.
At my Navy school we do a lesson called "Stability", it full of calculations but in theory this video is a pretty good presentation of how a ship rolls and how the stability is calculatesd. Well done on the images
Scrapping a ship and a cell tower if this huge depression continues much longer. Not down with the screw crew but it looks amazing. Let my heart go on jack
There's one system you have forgotten to talk about. In the big military ships, mostly the aircraft carriers, there's an active stability system also, and it must be very effective for the planes to land safely, even in rough weather. Inside the hull, between the center of buoyancy and the centre of gravity, there's two sets of rails going perpendicularly from the center axis, side to side. On these rails, there's one big mass which is moved by computers in the opposite direction of the waves.
@@chilfang2422 Tall Buildings generally use the mass dampener tho, which is just a very big ball of something heavy hanging on pistons, so that when the top of the building moves the mass is used to pull the building in the other direction. The Burj Khalifa notably lacks this, and instead uses its spiral shape to redirect windflow so it doesn't really swing a lot anyway (of course this would be a disadvantage in an earthquake)
I once took a trip with my family from England to Ireland and we caught a Ferry from Holyhead across the Irish Sea to Dublin. The sea was that rough that one of the ships stabilisers had completely broken. The Captain struggled to stabilise the vessel and couldn't arrive into the Port. It was at that point that he announced he had to turn back. What should have been a few hours crossing turned into something daft like a 4-6 hour trip. Partly because of how rough it actually was, was why it took so long, and obviously the technical difficulties of handling a ship that might not be responding well, lol. Lucky for us, we all took travel sickness tablets first because near enough everyone was sea sick. The toilets and troughs were filled with spew. A great memory for sure.
This is a myth, stabilisers are in fact a lot of fat people (called Stabilons) on the ship who run from side to side, this is very well hidden as they do it underneath the deck. I would know, I was a Stabilon, they force fed us to keep us fat from all the running 😔
The fin stabilisers were first used on royal navy missile ships in the 1960's they were used to hold the ship steady while it launched it missiles one of the first non navy ships that had this system was the Royal Yacht Britannia . I was an electronic wireman working for Muirheads of Beckenham and I wired the control box for this Yacht
I present you the Queen Mary 2! It has fins, tanks, active fins, everything you need. Works quite well, although there are still waves that can rock the old lady :)
I've been looking for a video like this for ages, I play a game called Stormworks, where you build ships and such for search and rescue operations, but some of the ships can get to a decent size, and as in the name of the game, you encounter storms, so it can be rather difficult to keep your ship upright during a heavy storm which is often when you need to use these rescue ships. Thank you for the video, it's been really helpful!
Going on a cruise later this year and I hate the sea, understanding what I'm going on and how I'm being safe really helps. As apposed to just being told I'm safe with no explanation.
Not for cruise ships, but there are another 2 types of active stabilizers that also work while stopped. One uses a heavy spinning weight on the center line inside the boat and a gyro to counter the force. The 2nd one is also spinning, but on the outside, like the active fins. Because they are spinning in the water, you don't need to be moving to build counter force.
When I was in the Navy I use to play around with subtle rudder action to stabilize the ship. The idea is simply to counter the wave action with a slight bow turn in the direction of the list. You have to be a bit ahead of it of course so the ship has time to respond but waves are very consistent in their timing so its really all about that...Timing.
I know just what you are talking about. Getting the timing right can be very difficult. Especially on an old ww2 tanker converted to crab processor. She comes around slow anyhow, but good timing still has an effect.
Niko Lindroos happened to me too I’m looking for new GPUs and instead of my usual pc and military notifications I get recommended guy throws car at wall
I have read of tuned mass dampeners in some vessels and on some cruise ships in bad weather, the captain having a certain % of guests go to lower decks to reduce the center of gravity, they provided food and etc to compensate for inconvenience but it did work, it's all physics and the ocean has a lotta dynamic variables.
On the Fast Frigate I served on, one could feel the stabilizers "kick in" with a slam at the end of each roll. And one time, (in band camp) Our ship broke down out at sea and we could not use our stabilizers... the whole crew was sea-sick (almost) until another ship towed us toward the Philippines, until we were close enough for a fleet tug to tow us the rest of the way. FYI: If you are ever going to break down and sit in a port for 3 months... do it in the Philippines.
My grandfather served on an iron ore ship on the great lakes, they were in one of the storms that lake superior is famous for, they were stuck crossways in the waves for half an hour, my grandpa states "I was standing in my bunck one second, then doing a head stand the other" the rudder on the ship was trying to steer the ship to be going into the waves, it took that half hour for the rudder to finally get the ship steered
The frigate I was on had active fin stabilizers. They were always broken though, so we would just roll from side to side. On particularly rough days, you'd start to see boot prints on the bulkheads (walls) of passageways. There were times on the bridge, when you were literally hanging on to something bolted down to keep from sliding across the deck, that I wondered if we would finally capsize.
Cool video, glad to have come across your channel! There are actually what’re called zero-speed fin stabilizers that don’t require you to be moving through the water. They have a much wider range of motion and use the fins kind of like wings. Not sure if they employ them on larger vessels though. They’re pretty common on recreational yachts in the 20 to 60 meter range. There is also another method of stabilization not mentioned. But again, i believe they’re only used on smaller vessels. I see them on sport fishing yachts most commonly. They’re called seakeepers and they use gyroscopic stabilization. It would be cool to see a video explaining their function, advantages and limitations.
I'd be shocked if the author here hadn't played Stormworks, a game entirely about building functional ships. I had a mate figure out he could use a weight actively rolled on a track positioned in the bottom of the ship to rapidly shift CG and counter rolling. Definitely a personnel safety hazard, but it did work.
@@moldman5694 We've got the technology for rolling things on tracks quite figured out. The main issue I (as a complete layperson) see is that the area in between the extreme positions needs to remain clear, costing a lot of space.
there are a couple of errors in the video: 1. you did not mention gyroscopic stabilizers 2. the way active fins works is not how you draw them in the video. they change angle of attack by turning front/rear, not up /down as you showed. There are indeed some fins that move up/ down and these are called zero speed because they can function while the ship is at rest. Otherwise great video!
I was having a real cognitive dissonance when he started talking about forward speed being necessary together with the wing profile and that shown angle change. I guessed that it must be an forward/backward AoA change for that to make sense. Thanks for clarifying that.
I love finding an amazing well produced intriguing video that teaches me something that I never would have searched. Never considered this fact! Amazing video
The best way to avoid spilling drinks on a cruise ship is to lay flat on the floor with a 5cm tube in your mouth attached to a large funnel. There, a trained professional can pour the drink into your mouth without spilling. In case of overage, members of the crew can stow you below decks on a gurney, and roll you back and forth in counteraction to the waves. It's great fun, and passengers & crew enjoy it immensely.
My Father was a cook aboard a passenger liner that sailed between Rotterdam and New York in the 1950 ‘s . Passengers had been complaining about the rolling of the ship and the decision was made to have stabilising fins fitted to the ship in Southhampton only to find out that they made the ship slowly dip in the water and had to slow the ship down every so often. The trip took a very long time to New York but the problem was rectified in NY. Must have been a Monday morning job !
My Chief Engineer always told me, "You put the right fin in, you put the right fin out. In, out, in, out shake it all about and then you do the hokey pokey and you turn around. That's what it's all about."
I just discovered your channel while searching for a video explaining how stabilisation fins work. I immedialtly subscribed after watching this video as it is simple and clear. Two things that are really appreciated by my students. So your video's have entered the Nautical college. :-) Thank you for making them and keep up the (very) good work.
Centre of buoyancy is always above the centre of gravity..... It must have gotten away from your observations... But still couldn't help to notice...... Awesome video.!
I think you’re confusing the metacentric point with the centre of buoyancy. The metacentric point must always be above the centre of gravity, yes, but the centre of buoyancy doesn’t. Depends entirely on hull shape
@@mygnac Pieter Elen Yes. Metacenter will always be vertically above center of buoyancy. But at 0:22, CG is above Buoyancy point. That should ensure the rollover of ship.
Sport fishing boats and luxury yachts sometimes use a gyroscopic stabilization system that is simply a heavy flywheel mounted on a pivot, the axis of which run from the port to starboard sides. When the boat starts to rock to one side, the spinning flywheel opposes the change in direction, while itself tilting fore or aft. Gyroscopic stabilization works really well.
The cruise ships only use them in heavier seas, they use up a lot of energy. Its costs more money in fuel. So when it gets so rough, that nobody is leaving their cabins to spend money......then they turn on the stabilizers.
Have the same effect on trains in certain rail conditions we call "Harmonic Sway". We battle it simply by changing our speed constantly while on the section of rail so that the sway of the train and dips and raises in the rail dont occur at the same time for too long.
Yes. One problem with these he didnt mention: they are difficult to maintain and repair since they are underwater. Another problem is that sometimes they are forgotten outside and they might catch a chain of a buoy or smash against the dock. They are only about 5 meters long, but thats enough to snag a buoy chain. It has happened before in tight channels.
Simon WoodburyForget Yes, but you gain a little bit of energy from the ship staying its course better so the rudder doesnt have to work as much. But overall you indeed lose energy on those.
Simon WoodburyForget Im an officer, have worked 1.5 years on a ropax with exactly these kinds of fins. Its called hydrodynamics, not aerodynamics. So much for understanding something. The waves do change the course of the ship. Even when you allow for much yawing on the autopilot. This is due to the changes on water resistance on each side of the ship due to the roll and the waves. This is the same as if you try to sail straight with a list, you will notice the ship wants to turn in the same direction of the list. This is partly why ropax ferries tend to run the heeling tanks a couple of minutes prior to a sharp turn in shallow waters, towards the direction of the turn, so there is less forces working against the course change. Having used these fins for 1.5 years pretty much every other day, i can inform you that the efficiency isnt greatly affected. What is expensive about them is the service. They dont push the ship deeper into the water, as one fin pushes one side down, the other lifts the other side up simoultaneously. They try to find a balance where they dont use up more energy by lifting or pushing down the entire ship. They monitor the lift and push on each side and balance it out so the forces equal to 0. The fins allow for less rudder movements, that is clealy seen on the indicator, so the increased drag from them creating a forced is partly reduced in the much larger surface area of the main rudders moving less. The way the ship is loaded affects the efficiency far more, so much that the difference in fuel consuption is 30% less if you get the weight of cargo just right. A full on aft trim will reduce the efficiency to an extreme amount, much more than any fin could potentionally do. Take a look at the rudder indicator in strong winds versus large waves, youll see a clear difference. In my sailboat racing days we regularly trained by taking off the rudder completely and only manouvering the boat with our sails to learn to reduce drag by using the rudder, the only time the rudder is used with any kind of force there is in emergency situations or really tight manouvers, so much so that when you do your penalties (turn 360 or 720 degrees in one go) you just give a push of momentum into the hull with the rudder and then completely let it go, doing the rest of the turning with your sails and shifting the centre of gravity with your body weight so you dont lose speed.
Simon WoodburyForget windsurfing also doesnt require a rudder, turns pretty damn sharply still. Same goes for sailboats. You can go any direction without a rudder just by manupulating the weight. If you turn the rudder you create more drag, thats why world champion class sailors train without a rudder every now and then. They barely use it when racing. 1% is meaningless compared to everything else that affects the efficiency. If you change the speed from 22 knots to 26 knots on the Ro-Pax i worked on, the fuel consumption goes up about 40%. From 190 kg/nm to 260 kg/nm. The waves by themselves affect it much more than 1%. The difference of using 3 engines instead of 4 engines or vice versa make up for way more than that 1%. Yes, it creates some drag, but its quite irrelevant compared to the other factors. If shipping companies want to sail more economically, they increase the margins of time the ship has to arrive to the next port. This way they can sail at the most economical speed and time currents well. A set of fins in relation to fuel economy is a drop in the ocean to the companies wallet.
Simon WoodburyForget So, the fins cost about $296 000, an increase of 3 knots speed costs $7 000 000 annually, if my maths are compltely correct after a 12 hour shift
Its good to see that there exists people that understands ship stability, the difference between center of gravity and the center of buoyancy. On modern ships the center of gravity is "always" over the water surface (buoyancy) and makes them tilt around at a defined angle of tilt.
On small boats and ships you can use buckets on a rope on both sides to stabilize it. While the bucket moves up on one side, it pulls heavily, while it moves down, it has no resistance.
I know the petronas towers have a mass damper installed which is quite high to counter the strong winds which make the tower sway. It’s basically a counter weight suspended with a spring. A similar device was used in the nose cone of a Renault formula 1 car to maximise tyre contact with the track surface when the car bounced over kerbs. I wonder if it could be applied to ships in a stabiliser function as well?
You can use the rudders to dampen the rolls. We had that on a ship I served on. You do need to switch it off when a helicopter needs to land though, you don’t want to have the helipad jerk away from under the helicopter.
When we took cruises decades ago (we wouldn't do it now with the way cruises have changed for the worse), the ships were said to be equipped with external stabilizers of some sort, but were seldom if ever used since operating them used up more fuel than without. Heaven forbid they should fork over a little more fuel money per trip.
When I was a lad in the '50s and travelled on Ellermans's WIlson Line between Hull and Rotterdam the dining room chairs were chained down, and the fixed tables had a raised edge to stop glasses falling off.
The ship I was on in the US Navy had fin stabilizers. They were always broke down. But when they worked they gave the ship a very unnatural rocking motion and we were more likely to get seasick.
In 2007 I was a board the Holland America cruise liner when a nearby hurricane caused our ship to tilt too far one way and we took on water. The state rooms were drenched. Nobody could walk straight and everyone many were sick. Every one ran into one another likes a bunch of drunks. What a wild and crazy trip that was!!
That ship model you were using looks eerily similar to the Queen Mary 2. I just recently went on a Transatlantic Crossing on board her and I have to say, despite some rough seas, it was the smoothest cruise I’ve ever been on.
@@kirkhamandy "Seakeeper Gyro Stabilizers on Sealine Yachts" This video is what made me think that it was a counterweight system. Skip to 1:42 in the video.
Hey 👋🏼 Can you make a video about how cruise ship (especially the R.M.S Queen Mary 2) stay upright in situation like loss of engine power in a storm or when they list. Basically stabilization at rest. Thanks a lot! Alex
![BOWKYLION - วิงวอน (ex-change) [Official MV]](http://i.ytimg.com/vi/cLdnZWDaO-w/mqdefault.jpg)
Thanks again for the amazing response to this video.
Just to clarify a few things that have come up a lot in the comments.
The centre of gravity and the centre of buoyancy are the correct way round in this video. Check out one of my earlier videos too see how it works: th-cam.com/video/DPV_VjzU9kE/w-d-xo.html
The stabilisers are a little confusing in the animation. They do twist rather than flap up and down. I struggled to animate the twisting motion when viewed from ahead so exaggerated the up and down element instead. Apologies for any confusion caused.
Wow lot of text
Just add real life photos or videos next time.
No-no-no, it's thank You for intelligible illustration
Id bet that if the stabilizer fin was twice the length it would operate at half the minimum speed. In the end it's just a wing and identical in function to an airplane's. It's the same fluid dynamics.
Thanks for the great video! If I may point out a very minor omission though, I think gyroscopic stabilisers deserved a mention. Albeit now mainly used in yachts, enormous gyroscopes were in fact installed on the transatlantic liner ‘Conte di Savoia’ in 1932.
Thank you, i was having trouble stabilising my cruise ship in rough waters
Yahya. M. Everyday problems am I right
@@calebprouty288 yeah bro i just hate it when im piloting my cruise ship and it starts shifting everywhere man
Yeah bro,I hate it when my cruise ship capsizes and sinks
Yea man I'm drunk asf sailing my big ass ship and my boat flips and I fall in the ocean ya know like we all can relate now I got my stabilizers I'm totally not tired asf and trying to find nun to fall asleep to
Just another everyday situation right😂
Oh no... Not one of these channels, where my life has nothing to do with it even remotely but videos are fascinating enough I just keep watching...
In my life on the other hand I can remember my last "ride" on the North Sea with those stabilizers at work. Little foaming waves you didn't even see, though seemingly the ship's stabilizers had problems with those. Result, the ship rolling heavily from one side to another, each time being abruptly stopped in its roll by the stabilizers . Very unpleasant. In the souvenir the floor was littered with items which had flown from the shelves and a fridge on wheels was rolling freely through the restaurant. We arrived with a 4 hours delay.
I watch so many educational videos on subjects that have no relation to my life it’s almost funny. A ‘for instance’ I live in Utah in the USA, one of the driest places in the country, I’ve never even touched the controls of a boat, but still this video has gotten me thinking about how these systems work; also fluid dynamics apply to air, and boy do we have plenty of room to fly things here :). I wonder if any form of passive control could be created for air flight stabilization from wind ....?
Great video! I love learning from creators like this, those who even if they are very understated in their tone, clearly convey the breadth of knowledge they carry.
We need human stabalizers for drunk people, underrated channel
Lol alcohol turns people's stabilizers off
Drunk people on a cruise ship? nooooo
Yep , fit them with giros !
gravity does not exist
People have integrated stabilizers but some choose to disable them momentarily with alcohol ;)
At my Navy school we do a lesson called "Stability", it full of calculations but in theory this video is a pretty good presentation of how a ship rolls and how the stability is calculatesd. Well done on the images
Scrapping a ship and a cell tower if this huge depression continues much longer. Not down with the screw crew but it looks amazing. Let my heart go on jack
There's one system you have forgotten to talk about.
In the big military ships, mostly the aircraft carriers, there's an active stability system also, and it must be very effective for the planes to land safely, even in rough weather. Inside the hull, between the center of buoyancy and the centre of gravity, there's two sets of rails going perpendicularly from the center axis, side to side. On these rails, there's one big mass which is moved by computers in the opposite direction of the waves.
That's functionally the same as the water pumping stabilizers. Just moving mass around inside the ship.
tall buildings have those too!
@@chilfang2422 Tall Buildings generally use the mass dampener tho, which is just a very big ball of something heavy hanging on pistons, so that when the top of the building moves the mass is used to pull the building in the other direction. The Burj Khalifa notably lacks this, and instead uses its spiral shape to redirect windflow so it doesn't really swing a lot anyway (of course this would be a disadvantage in an earthquake)
I once took a trip with my family from England to Ireland and we caught a Ferry from Holyhead across the Irish Sea to Dublin. The sea was that rough that one of the ships stabilisers had completely broken. The Captain struggled to stabilise the vessel and couldn't arrive into the Port. It was at that point that he announced he had to turn back. What should have been a few hours crossing turned into something daft like a 4-6 hour trip.
Partly because of how rough it actually was, was why it took so long, and obviously the technical difficulties of handling a ship that might not be responding well, lol. Lucky for us, we all took travel sickness tablets first because near enough everyone was sea sick. The toilets and troughs were filled with spew. A great memory for sure.
Learning has occurred
-100 respect for not getting verified
Funny seeing you here
Gyro for MG recoil. Idea.
Buy silver than crypto currency buy silver silver nitrate is used in rocket fuels and pharma industry
Hello Mr Checkmark
This is a myth, stabilisers are in fact a lot of fat people (called Stabilons) on the ship who run from side to side, this is very well hidden as they do it underneath the deck. I would know, I was a Stabilon, they force fed us to keep us fat from all the running 😔
Feyo Marseille dream job free food and travel
I heard your mother alone was enough to stabilize the biggest ship in the world
I read about your plight in Reader's Digest. Must have been horrible.
Fred Lamb thanks for your condolences
Vevey women weren’t allowed to work on the ship, bare in mind these were olden times
the noise at 1:15 is glorious
Container ship be like "Queef noises"
*Fat fart.*
@@scortexfire wet fart😁
After a long night of whiskey and taco bell
😂😂😂😂😂😂😂😂😂🌝
Thanks I really needed this info for my 3 month journey from Norway to Iceland
In 105 A.D
Maelstrum yes 105 A.D?
@@NoobMicesters yos
Maelstrum yes
You are the human that rules !!
Take us all back to your home
planet !!!!
Buy silver than crypto currency buy silver silver nitrate is used in rocket fuels and pharma industry
The fin stabilisers were first used on royal navy missile ships in the 1960's they were used to hold the ship steady while it launched it missiles one of the first non navy ships that had this system was the Royal Yacht Britannia . I was an electronic wireman working for Muirheads of Beckenham and I wired the control box for this Yacht
nice
Is this Reddit?
That’s amazing, thanks for sharing your knowledge and experience. You must have seen and done so much. You should make a video about your experiences.
Thanks for your sharing knowledge
Cor
Question. Any chance that all these stabilizers are installed together in one ship and work coherently? That would be glorious!
to expensive and too much space
@@joeyknight8272 but It could probably be done
I wanna see a floating city. That would be awesome!
I present you the Queen Mary 2! It has fins, tanks, active fins, everything you need. Works quite well, although there are still waves that can rock the old lady :)
userful1 😮
I've been looking for a video like this for ages, I play a game called Stormworks, where you build ships and such for search and rescue operations, but some of the ships can get to a decent size, and as in the name of the game, you encounter storms, so it can be rather difficult to keep your ship upright during a heavy storm which is often when you need to use these rescue ships. Thank you for the video, it's been really helpful!
i also play that game its pretty fun
wait, are the game physics good enough that these things help?
have you played "from the depths"
@@Great.Milenko I have actually, got around 1000 hours on it 😂 its a fantastic game!
ayy I love that game
I was on the QM2 from NY to Southampton in May 2009. There were 30ft waves in a storm. I was amazed at how stable the ship stayed.
I'm gonna be honest, your stuff was randomly in my feed and I just went. 🤷♀️ why not and now I'm just watching a lot of your vids
Ha! Me too.
Hey I really like your profile pic :)
Me too!
Same here.
thats good your going with the Flow...chuckle
Going on a cruise later this year and I hate the sea, understanding what I'm going on and how I'm being safe really helps. As apposed to just being told I'm safe with no explanation.
Rejoice! for the mighty youtube algorithm has found yee
It is salvation
"and there was much rejoicing"
Not for cruise ships, but there are another 2 types of active stabilizers that also work while stopped. One uses a heavy spinning weight on the center line inside the boat and a gyro to counter the force. The 2nd one is also spinning, but on the outside, like the active fins. Because they are spinning in the water, you don't need to be moving to build counter force.
When I was in the Navy I use to play around with subtle rudder action to stabilize the ship. The idea is simply to counter the wave action with a slight bow turn in the direction of the list.
You have to be a bit ahead of it of course so the ship has time to respond but waves are very consistent in their timing so its really all about that...Timing.
I know just what you are talking about. Getting the timing right can be very difficult. Especially on an old ww2 tanker converted to crab processor. She comes around slow anyhow, but good timing still has an effect.
It's 3AM, and I'm watching this... I love TH-cam so much, interesting things and knowledge served everyday
I don't remember when I found this channel, or really anything about this channel.
So this video came as a very pleasant surprise.
Same here man.
Me: looking ideas for a PC setup/desk
TH-cam: wanna see some ship Stabilisers?
Niko Lindroos happened to me too I’m looking for new GPUs and instead of my usual pc and military notifications I get recommended guy throws car at wall
Same here
TH-cam
Same but i was looking for sinking ships not how to stop a ship from sinking
Just get an IKEA linnmon desk.
I have read of tuned mass dampeners in some vessels and on some cruise ships in bad weather, the captain having a certain % of guests go to lower decks to reduce the center of gravity, they provided food and etc to compensate for inconvenience but it did work, it's all physics and the ocean has a lotta dynamic variables.
On the Fast Frigate I served on, one could feel the stabilizers "kick in" with a slam at the end of each roll. And one time, (in band camp) Our ship broke down out at sea and we could not use our stabilizers... the whole crew was sea-sick (almost) until another ship towed us toward the Philippines, until we were close enough for a fleet tug to tow us the rest of the way. FYI: If you are ever going to break down and sit in a port for 3 months... do it in the Philippines.
My grandfather served on an iron ore ship on the great lakes, they were in one of the storms that lake superior is famous for, they were stuck crossways in the waves for half an hour, my grandpa states "I was standing in my bunck one second, then doing a head stand the other" the rudder on the ship was trying to steer the ship to be going into the waves, it took that half hour for the rudder to finally get the ship steered
5:10 "You can use it to counter other forces"
*Like god*
As if god was a force lol.
@@GoldSrc_ Oh my, it's Gordon Freeman! I'm a big fan.
@@GoldSrc_ Titanic joke mate
@@CloudCosm0ss Shit, it's GabeN
Better go back to the fridge.
Those cheesy sound effects are glorious.
The frigate I was on had active fin stabilizers. They were always broken though, so we would just roll from side to side. On particularly rough days, you'd start to see boot prints on the bulkheads (walls) of passageways. There were times on the bridge, when you were literally hanging on to something bolted down to keep from sliding across the deck, that I wondered if we would finally capsize.
Cool video, glad to have come across your channel!
There are actually what’re called zero-speed fin stabilizers that don’t require you to be moving through the water. They have a much wider range of motion and use the fins kind of like wings. Not sure if they employ them on larger vessels though. They’re pretty common on recreational yachts in the 20 to 60 meter range.
There is also another method of stabilization not mentioned. But again, i believe they’re only used on smaller vessels. I see them on sport fishing yachts most commonly. They’re called seakeepers and they use gyroscopic stabilization. It would be cool to see a video explaining their function, advantages and limitations.
I'd be shocked if the author here hadn't played Stormworks, a game entirely about building functional ships. I had a mate figure out he could use a weight actively rolled on a track positioned in the bottom of the ship to rapidly shift CG and counter rolling. Definitely a personnel safety hazard, but it did work.
A good example of something that works very well in stormworks but would be a mechanical nightmare irl.
@@moldman5694 We've got the technology for rolling things on tracks quite figured out. The main issue I (as a complete layperson) see is that the area in between the extreme positions needs to remain clear, costing a lot of space.
there are a couple of errors in the video: 1. you did not mention gyroscopic stabilizers 2. the way active fins works is not how you draw them in the video. they change angle of attack by turning front/rear, not up /down as you showed. There are indeed some fins that move up/ down and these are called zero speed because they can function while the ship is at rest. Otherwise great video!
He mentioned gyroscopes being used in tandem with other stabilizer methods.
@@dhkatz_ In the video he meant gyros for measurement but andre means gyros that stabilize.
I was having a real cognitive dissonance when he started talking about forward speed being necessary together with the wing profile and that shown angle change. I guessed that it must be an forward/backward AoA change for that to make sense. Thanks for clarifying that.
I love finding an amazing well produced intriguing video that teaches me something that I never would have searched.
Never considered this fact! Amazing video
The best way to avoid spilling drinks on a cruise ship is to lay flat on the floor with a 5cm tube in your mouth attached to a large funnel.
There, a trained professional can pour the drink into your mouth without spilling.
In case of overage, members of the crew can stow you below decks on a gurney, and roll you back and forth in counteraction to the waves.
It's great fun, and passengers & crew enjoy it immensely.
The fuck..
My Father was a cook aboard a passenger liner that sailed between Rotterdam and New York in the 1950 ‘s . Passengers had been complaining about the rolling of the ship and the decision was made to have stabilising fins fitted to the ship in Southhampton only to find out that they made the ship slowly dip in the water and had to slow the ship down every so often. The trip took a very long time to New York but the problem was rectified in NY. Must have been a Monday morning job !
Saturday Night:...
TH-cam: Do you want to watch video about ship stabilisers?
Eric and the answer better be “hell yes TH-cam”
saturday night for me too, one week later from your comment. Do they actually schedule this video to be suggested on Saturdays
Saturday night for me. I found the video interesting.
Haha 2 months ahead, it's my Saturday night, my 4th video from the channel, and I just subbed. Niiiice. 🤟🏼✌🏼🇺🇸🦅
That’s honestly me right now.
Great explanation for a novice seaman.
My Chief Engineer always told me, "You put the right fin in, you put the right fin out. In, out, in, out shake it all about and then you do the hokey pokey and you turn around. That's what it's all about."
I just discovered your channel while searching for a video explaining how stabilisation fins work.
I immedialtly subscribed after watching this video as it is simple and clear.
Two things that are really appreciated by my students.
So your video's have entered the Nautical college. :-)
Thank you for making them and keep up the (very) good work.
Ship: 'They see me rolling, the... wait... they try to dampen my roll!'
Me: Does a barrel roll
Everyone in the cruise ship:
Trynna stop me rolling dirtyy
They dampin'
Well written. Nice commentaries. Appropriate drawings. Excellent narration.
Centre of buoyancy is always above the centre of gravity.....
It must have gotten away from your observations... But still couldn't help to notice......
Awesome video.!
I think you’re confusing the metacentric point with the centre of buoyancy. The metacentric point must always be above the centre of gravity, yes, but the centre of buoyancy doesn’t. Depends entirely on hull shape
@@mygnac Pieter Elen Yes. Metacenter will always be vertically above center of buoyancy.
But at 0:22, CG is above Buoyancy point. That should ensure the rollover of ship.
@@saurabhjambotkar9077the ship stays upright due to form stability. The center of gravity is often many meters above the centre of buoyancy.
Sport fishing boats and luxury yachts sometimes use a gyroscopic stabilization system that is simply a heavy flywheel mounted on a pivot, the axis of which run from the port to starboard sides.
When the boat starts to rock to one side, the spinning flywheel opposes the change in direction, while itself tilting fore or aft. Gyroscopic stabilization works really well.
Your channel is brilliant. Clearly a lot of effort and time goes into creating quality content. Really appreciated. Keep it up!
I am going to study Naval engineering in the university. really enjoy the facts of ships
This is the third video I watched. Consider me won over and subscribed
Love that the little ship drawing is the Queen Mary 2.
1:04 why is there a blurr in the video? What kind of stuff do you draw on your boats? ;)
Good to know im not the only one who noticed that
I love the funny sound effect used when the unstabilized ship capsized. Makes it obvious and humorous audibly. :P
The cruise ships only use them in heavier seas, they use up a lot of energy.
Its costs more money in fuel.
So when it gets so rough, that nobody is leaving their cabins to spend money......then they turn on the stabilizers.
Is this true? I wish the creator of this video would comment on this comment.
We used to use them almost all the time. Mainly because if someone injured themselves and the stabilisers weren't out, questions would get asked
you forgot the HUGE and THICC gyroscope stabilator used in steam ships
Marie BCFHS and lots of smaller sport fishing vessels. There’s also zero speed fin stabilizers that actually do flap like wings
ayyyy it's a nautical channel that actually knows what they're talking about, subbed :)
Why I'm subbing
Have the same effect on trains in certain rail conditions we call "Harmonic Sway". We battle it simply by changing our speed constantly while on the section of rail so that the sway of the train and dips and raises in the rail dont occur at the same time for too long.
Who's here because their cruise ships aren't stable enough?
Well, I came for the job myself
Carnival Magic is one wobbly ship. Been on several not nearly as bad
@@ScroatBagGarage I feel that I went on carnival glory after it wasn’t as bad as magic
More like small yacht.. unfortunately have fins but am under 75 meters. I’ve read gyro is better for smaller yachts.. I’m on a 1960s yacht as well;)
Hoppe has a good demonstration on Flume tank stabilization. These were used effectively on LASH barge carriers in the 70’s. Good work.
This knowledge is going straight on my CV.
Really Helping me out on deciding which Stabilization System should I use on Stormworks
Since u mentioned about Gyroscope,
Can u please make a video regarding that!
Your videos are really helpful and I have vigorously learnt a lot from you. Thank You !!!!
Wait what? Ships have FINS ?
**THE MORE YOU KNOW**
Thanks for the infos youre giving, underrated!
Yes. One problem with these he didnt mention: they are difficult to maintain and repair since they are underwater. Another problem is that sometimes they are forgotten outside and they might catch a chain of a buoy or smash against the dock. They are only about 5 meters long, but thats enough to snag a buoy chain. It has happened before in tight channels.
Simon WoodburyForget Yes, but you gain a little bit of energy from the ship staying its course better so the rudder doesnt have to work as much. But overall you indeed lose energy on those.
Simon WoodburyForget
Im an officer, have worked 1.5 years on a ropax with exactly these kinds of fins.
Its called hydrodynamics, not aerodynamics. So much for understanding something.
The waves do change the course of the ship. Even when you allow for much yawing on the autopilot. This is due to the changes on water resistance on each side of the ship due to the roll and the waves. This is the same as if you try to sail straight with a list, you will notice the ship wants to turn in the same direction of the list. This is partly why ropax ferries tend to run the heeling tanks a couple of minutes prior to a sharp turn in shallow waters, towards the direction of the turn, so there is less forces working against the course change.
Having used these fins for 1.5 years pretty much every other day, i can inform you that the efficiency isnt greatly affected. What is expensive about them is the service.
They dont push the ship deeper into the water, as one fin pushes one side down, the other lifts the other side up simoultaneously. They try to find a balance where they dont use up more energy by lifting or pushing down the entire ship. They monitor the lift and push on each side and balance it out so the forces equal to 0.
The fins allow for less rudder movements, that is clealy seen on the indicator, so the increased drag from them creating a forced is partly reduced in the much larger surface area of the main rudders moving less.
The way the ship is loaded affects the efficiency far more, so much that the difference in fuel consuption is 30% less if you get the weight of cargo just right. A full on aft trim will reduce the efficiency to an extreme amount, much more than any fin could potentionally do.
Take a look at the rudder indicator in strong winds versus large waves, youll see a clear difference.
In my sailboat racing days we regularly trained by taking off the rudder completely and only manouvering the boat with our sails to learn to reduce drag by using the rudder, the only time the rudder is used with any kind of force there is in emergency situations or really tight manouvers, so much so that when you do your penalties (turn 360 or 720 degrees in one go) you just give a push of momentum into the hull with the rudder and then completely let it go, doing the rest of the turning with your sails and shifting the centre of gravity with your body weight so you dont lose speed.
Simon WoodburyForget windsurfing also doesnt require a rudder, turns pretty damn sharply still. Same goes for sailboats. You can go any direction without a rudder just by manupulating the weight. If you turn the rudder you create more drag, thats why world champion class sailors train without a rudder every now and then. They barely use it when racing.
1% is meaningless compared to everything else that affects the efficiency. If you change the speed from 22 knots to 26 knots on the Ro-Pax i worked on, the fuel consumption goes up about 40%. From 190 kg/nm to 260 kg/nm.
The waves by themselves affect it much more than 1%.
The difference of using 3 engines instead of 4 engines or vice versa make up for way more than that 1%.
Yes, it creates some drag, but its quite irrelevant compared to the other factors.
If shipping companies want to sail more economically, they increase the margins of time the ship has to arrive to the next port. This way they can sail at the most economical speed and time currents well. A set of fins in relation to fuel economy is a drop in the ocean to the companies wallet.
Simon WoodburyForget So, the fins cost about $296 000, an increase of 3 knots speed costs $7 000 000 annually, if my maths are compltely correct after a 12 hour shift
Its good to see that there exists people that understands ship stability, the difference between center of gravity and the center of buoyancy.
On modern ships the center of gravity is "always" over the water surface (buoyancy) and makes them tilt around at a defined angle of tilt.
I’m glad that the TH-cam algorithm occasionally does work by suggesting me this video
You're like the Chain Bear Formula 1 channel of the Nautical Marine Variety. I love these.
I've heard about ships with gyroscopic stabilizer that spins huge chunks of metal to counter the ship's rolling, man that was amazing
"She" omg finally someone that knows how to talk ships (ships, not boats. Im to excited about this)
Amazing video... Your channel is different and interesting...
TH-cam algorithm will soon endorse you..
Thanks for great video...🙏👍
NAVEEN RAJ there are alot of channels who do the same thing as him
@@samson_the_great
But i dont know about it...
Or demonetize it, because TH-cam is shit
Already did this week.
On small boats and ships you can use buckets on a rope on both sides to stabilize it. While the bucket moves up on one side, it pulls heavily, while it moves down, it has no resistance.
Another youtube channel star is born!
I like how youtube answers the questions i never asked.tq..i appreciated it
The Conte di Savoia was the first major liner fitted with gyroscopic stabilizers. The ship was built in 1931 and scrapped in 1950.
Yes, but they were huge and acted more like flywheels, keeping the ship stable with sheer force, not by controlling other stabilizing systems.
Very interesting indeed. Note of curiosity, the (drawing) of the cruise ship called the Andrea Doria, was the Italian flagship sunk many years ago.
I know the petronas towers have a mass damper installed which is quite high to counter the strong winds which make the tower sway. It’s basically a counter weight suspended with a spring. A similar device was used in the nose cone of a Renault formula 1 car to maximise tyre contact with the track surface when the car bounced over kerbs. I wonder if it could be applied to ships in a stabiliser function as well?
If you’re weird you can put a big long stable wire down underneath the boat.
At the end of the pipe a massive weight. This stops it from tipping.
5:05
The ship is growing , it has evolved arms!
You can use the rudders to dampen the rolls. We had that on a ship I served on. You do need to switch it off when a helicopter needs to land though, you don’t want to have the helipad jerk away from under the helicopter.
When we took cruises decades ago (we wouldn't do it now with the way cruises have changed for the worse), the ships were said to be equipped with external stabilizers of some sort, but were seldom if ever used since operating them used up more fuel than without. Heaven forbid they should fork over a little more fuel money per trip.
When I was a lad in the '50s and travelled on Ellermans's WIlson Line between Hull and Rotterdam the dining room chairs were chained down, and the fixed tables had a raised edge to stop glasses falling off.
Never knew that cruise ships had little legs at the bottom.
The ship I was on in the US Navy had fin stabilizers. They were always broke down. But when they worked they gave the ship a very unnatural rocking motion and we were more likely to get seasick.
Gained new knowledge today. Thank you ❤
how fitting that i discovered your channel after becoming super interested in sailing ships because of my time on a cruise ship (: love the videos!
13 years working offshore and never been on a vessel with stabilisers. I suffered. ☹️
Have you ever tried doing it at night while the ship was rocking? If so, how was it?
More trivial information I’ll never need yet couldn’t stop watching
I see you're the sea and water transport version of Wendover Productions. Subbed and looking forward to learn more.
In 2007 I was a board the Holland America cruise liner when a nearby hurricane caused our ship to tilt too far one way and we took on water. The state rooms were drenched. Nobody could walk straight and everyone many were sick. Every one ran into one another likes a bunch of drunks. What a wild and crazy trip that was!!
Greater work. You have an awesome announcer's voice.
I never thought that I ever will watch several videos which essentially talk about center of gravity and buoyancy
This video will be really helpful to many seafarers. Great job team !!!! Expecting the next video very soon.
A person expecting to have a flute of bubbly in rough weather is partly responsible for our devolving
ah, i swear Norwegian Joy rocked a bit from time to time. Great to learn this lmao
I liked the subtle Andrea Doria reference! My family came to the US on her maiden voyage in 53’, I still have the boarding pass 😁
If you add a Humming Bird kit to the Fin Stabilizers you can actually make the ship fly ABOVE the water, thus avoiding the waves all-together!👍
Wahahaha right👍👍👍👍
That ship model you were using looks eerily similar to the Queen Mary 2. I just recently went on a Transatlantic Crossing on board her and I have to say, despite some rough seas, it was the smoothest cruise I’ve ever been on.
Wait what? I am so suprised by your subscriber count, you deserve much much more. Youre channel is going to blow up in subs very very soon
I thought ship stabilisers were counterweights operated by a gyroscopic stabiliser, this has been most interesting sir
@@kirkhamandy "Seakeeper Gyro Stabilizers on Sealine Yachts" This video is what made me think that it was a counterweight system. Skip to 1:42 in the video.
@@kirkhamandy theres only one building with that hanging weight at the top, which does nothing anyway.
Awesome 25k sub more in just a day that's good news .....all the best sir .....
I always wondered how did ships remained stable in waves. Thank you for explaining this to me.
Hey 👋🏼
Can you make a video about how cruise ship (especially the R.M.S Queen Mary 2) stay upright in situation like loss of engine power in a storm or when they list. Basically stabilization at rest. Thanks a lot!
Alex
this video has cleared all the illusions came through my mind so far.... informative it is
What an interesting channel. I hope to watch much more of this content.