Sir, your graphics are awesome, but the basic concept is incorrectly explained. The vessel turns due to the lever arm created by the forces applied at the stern, as you described them, multiplied by the distance from the stern to the pivot point. This distance is generally 2/3 of the lenght over all. That is why such a comparatively small item can make such a big object turn. This is further confirmed when you look at the power of bow thrusters vs stern thrusters. Naval architects use the distance from the pivot point to the bow/stern to determine the size of thrusters to install resulting on smaller stern thrusters. When the pivot point shifts location aft, as when going astern, one of the reasons for diminishing rudder efficiency is a shorter lever -generally to 1/3 of the LOA.
The helmsman will turn the wheel to the port and the rudder will turun towards port side and the lift force on the rudder will act towards starboard side.
So, basically the rudder just initiates the direction and the physical resistance of the water which the ship ''slides against'' does the rest? Does that mean all the steering takes place in the front, even though it's initiated on the aft? That must be very, very delayed steering.
Yea, rudder allows the ship to slightly turn and due to the sway component change in direction of ships take place. The steering is tilting the rudder which moves the ship at its centre of gravity.
When the Titanic lookout spotted the iceberg in 1912, the order to the helmsman was "hard to starboard" although the ship actually turned slowly to port. Apparently that was a correct command in 1912 & everyone knew what it meant in that the ship would turn in the opposite direction of the command. Very confusing as I would order "hard to port" to miss the iceberg to the left. Also, for a ship the size of the Titanic going at full speed, when the command given, how far would they need to have been from the iceberg to miss it ? The Titanic also reversed its engines, so I presume the 3 large propellors in reverse would negate the effect of their undersized rudder. In view of what you have explained in this video, do you have an opinion as to whether Titanic may have had a better chance of missing the iceberg had they not reversed the engines and relied on the rudder alone?
But the thing is if they had turned to port side then the stern stbd part of ship would hit iceberg. Problem was they could judge the under water size of iceberg and second they were late in giving command.
Basically, the captain kept on sailing it at high-speed despite having the report that there were a large number of the massive iceberg in the sea. Still, they wanted to make a record of covering the distance in minimum time.
The order was "hard to starbrd" which stems from the old sailing days where putting the tiller hard to starbrd resulted in the vessel turning to port. The idea would have been to reverse the helm order once the bow was clear to swing the stern clear. Ironically, had they hit the berg head on, even at full speed, the ship would not have sunk, though I'm sure there would have been many injuries. The idea of not taking any action and running into an iceberg at full speed however, is not exactly intuitive. You are right that the order to reverse engines, would negate the effect of the rudder, as the water flow past the rudder would have been reduced and then become turbulent. If anything, only reversing the port engine would have been more appropriate, but I'm not sure if that was possible on the Titanic.
H, sorry but the explanation is incomplete if it is not explained how it is that the design makes the bow inertia water force be greater than the stern force
Does prop wash play any role in these large ships? I mean imagine if propellers stopped and they put the rudder to hard starboard. How significantly will that affect the turn?
Hi Malek The basics has been explained. For more details, please refer to out website - www.marineinsight.com/naval-architecture/types-rudders-used-ships/
Nicely explained with best presentation.
Thank you Rajiv. Please do share and support 👍🏻
sir i just wanted to know what is a rudder and its function in ship,the explanation could have been much more simpler
Super useful explanation, thank you!
Glad it was helpful! Please do share and support 👍
Sir, your graphics are awesome, but the basic concept is incorrectly explained. The vessel turns due to the lever arm created by the forces applied at the stern, as you described them, multiplied by the distance from the stern to the pivot point. This distance is generally 2/3 of the lenght over all. That is why such a comparatively small item can make such a big object turn.
This is further confirmed when you look at the power of bow thrusters vs stern thrusters. Naval architects use the distance from the pivot point to the bow/stern to determine the size of thrusters to install resulting on smaller stern thrusters. When the pivot point shifts location aft, as when going astern, one of the reasons for diminishing rudder efficiency is a shorter lever -generally to 1/3 of the LOA.
If ship needs to be turned to port then what will be the direction of rudder ?
port or starboard ?
The helmsman will turn the wheel to the port and the rudder will turun towards port side and the lift force on the rudder will act towards starboard side.
I don't understand the video well can you simplify more ?
Hello sir. What if going astern and the rudder is in hard port. What is the direction of the ship.?
"Rudder does not turn ship" = "here how turning the rudder turns the ship".
So, basically the rudder just initiates the direction and the physical resistance of the water which the ship ''slides against'' does the rest? Does that mean all the steering takes place in the front, even though it's initiated on the aft? That must be very, very delayed steering.
Yea, rudder allows the ship to slightly turn and due to the sway component change in direction of ships take place. The steering is tilting the rudder which moves the ship at its centre of gravity.
Now you know why the Titanic couldn't avoid that iceberg. 😐
thank you very much marine insight
You are very welcome
Can you make a video on the different kinds of ships ?
Very useful information and very well presentation
Glad you liked it Nitin, please do share and support 👍🏻
Nicely Explained. You may want to add the concept of centripetal force and lift and drag forces for better understanding.
Thank you Max for the suggestion
Why does the force come into play?
why do we will feel vibrations in rudder? Is it designing issue of the rudder?
Vibration is there in all the machinery.
Does the rudder turn the ship if we put rudder in the forward side
Nice explanation
Glad you liked it
Thanks and welcome
When the Titanic lookout spotted the iceberg in 1912, the order to the helmsman was "hard to starboard" although the ship actually turned slowly to port. Apparently that was a correct command in 1912 & everyone knew what it meant in that the ship would turn in the opposite direction of the command. Very confusing as I would order "hard to port" to miss the iceberg to the left. Also, for a ship the size of the Titanic going at full speed, when the command given, how far would they need to have been from the iceberg to miss it ? The Titanic also reversed its engines, so I presume the 3 large propellors in reverse would negate the effect of their undersized rudder. In view of what you have explained in this video, do you have an opinion as to whether Titanic may have had a better chance of missing the iceberg had they not reversed the engines and relied on the rudder alone?
But the thing is if they had turned to port side then the stern stbd part of ship would hit iceberg.
Problem was they could judge the under water size of iceberg and second they were late in giving command.
I think that im the only one to finish this coment
Basically, the captain kept on sailing it at high-speed despite having the report that there were a large number of the massive iceberg in the sea. Still, they wanted to make a record of covering the distance in minimum time.
The order was "hard to starbrd" which stems from the old sailing days where putting the tiller hard to starbrd resulted in the vessel turning to port. The idea would have been to reverse the helm order once the bow was clear to swing the stern clear. Ironically, had they hit the berg head on, even at full speed, the ship would not have sunk, though I'm sure there would have been many injuries. The idea of not taking any action and running into an iceberg at full speed however, is not exactly intuitive. You are right that the order to reverse engines, would negate the effect of the rudder, as the water flow past the rudder would have been reduced and then become turbulent. If anything, only reversing the port engine would have been more appropriate, but I'm not sure if that was possible on the Titanic.
Where semi/balance/unbalanced rudder is used
So it comes down to the design of the ship.
H, sorry but the explanation is incomplete if it is not explained how it is that the design makes the bow inertia water force be greater than the stern force
Thank you Sir
Most welcome
The example of unbalanced rudder is the rudder of the titanic
👍
Thanks !
👍🏻 You are most welcome
@@marineinsight my pleasure !
Well explained
Thank you Vivek. Please do share and support 👍🏻
Is there any method of turning an autonomous ship?
Automatically !
What is rudder locking?
It may occur due to hydraulic system failure.
@@marineinsight Thanks.
Why it is more easier to turn the ship while running into the wind?
Does prop wash play any role in these large ships? I mean imagine if propellers stopped and they put the rudder to hard starboard. How significantly will that affect the turn?
so cool bro, thanks for AA
Glad you liked it
HARD TO STARBOARD!
How about the pivot point and centre of gravity?🥴
Tq bro
👍🏻
How many people can ride on a big boat
You mean cargo ship?
Sir plissss properly explain in roder work
Hi Malek
The basics has been explained. For more details, please refer to out website - www.marineinsight.com/naval-architecture/types-rudders-used-ships/
Needs subtitles
1:33 this is called megalophobia
IVO POLIC
😄
👍🏻
nonsense LMAO