Rotor Sail Explained
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- Опубликовано: 15 фев 2021
- #flettnersail #flettner #flettnerrotor #magnuseffect #shipsail
Flettner rotor sail as explained in this video is an unconventional means of vessel propulsion and stabilization. First developed by German engineer Anton Flettner in the early 1900s, it uses a phenomenon of fluid dynamics known as the Magnus effect to propel the ship.
The Flettner sailing rotor efficiency depends on many factors, one being the type of the ship. The Flettner rotor sail technology is powered by small motor that is located within the hull, while the rotors themselves project vertically upwards for propulsion. As they rotate, the Magnus effect comes into play, and a horizontal thrust is generated to the aft of the vessel. The main source of energy is the motors that power the rotors, while the output is provided by the relative motion of the surrounding air.
The correct direction of rotation with respect to the airflow direction can enhance the Flettner rotor sial performance and efficiency as explained in this video.
Video Credit - Norsepower - www.norsepower.com/
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Thanks for the diagrams and vector mechanisms that explains how this actually works. It's clearly a supplemental power source not a main power source. Still, fuel savings is fuel savings and that's money in the bank.
Yes, it is not a primary propulsion system. It assists the main engine to reduce load and ultimately overall fuel consumption of the ship.
@@marineinsight Except you forget that it cost load to power those giant rotors. Not to mention it is very situational and the wind has to blow in your favor. Also has to blow very fast. The amount of weight it adds and also the uncertainty of the wind, makes this pretty useless tbh.
I dont understand how this could be better than a wind turbine?.
@@johndor7793 It is not better but works onshore (on a ship) and does not need 100 m height.
I meant offshore,of course.
The rotor on the passanger ship (Viking Grace) was removed in April because the benefits were marginal on the ship’s current route.
Rotorsails do work and at amazing efficency - but but a single rotor that tiny on a ship that huge - of course it would not do much.
The tests lined up well with designed and predicted fuel savings, which were about 300 tons per year. The rotor sail was removed after completion of the trial and Viking's newest ship was built for use with a rotor sail so it seems they're committed to the technology.
Very nice explanation.
Basic concept and simple explanation shown in a perfect way.👍👍
Glad you liked it! Please do share and support 👍
Good explaination. Raspy music enhances so my speaker icon was useful. Today, October 5, is a story about WindWings. If the wind is blowing in the right direction, let us also consider canvas sails. Old ways worked fine, adding a bit of rope, and a crows nest to watch where the ship is going.
The SC Connector has just come along side my vessel in Bergen. Very impressive.
Your channel is Amazing it help us to grow knowledge. Keep it up
👍🏻
Thanks a ton Please do share and support 👍🏻
works with sidewind only. incase of headwind it is counter productive,so they should make it retractable,also helps with bridges.
Did you watch the part of the video where they showed the "tiltable" version?
No, it works with any wind direction, except straight into the wind. The magnus force works perpendicular to the wind direction. This means there will always be a forward-component in the resulting magnus force (again, except when heading exactly into the wind).
idk...even the purpose of me watch this but,good explenation
Thank you for commenting👍🏻
I am going to make my project on based on magnus effect. Your video's are really helpful ❤️⚓
Which will be displayed in NAUGHTICA maritime event.
Very interesting phenomenon well explained. Annoying music, though.
Wouldn't it work only if the wind are perpendicular to path of the ship for this to work?
A magnus rotor will produce a force perpendicular to the wind. That force can be divided into a side ways component (like X-axis, resulting in heeling) and a propulsion component (like Y-axis). At almost any angle of wind (except when sailing straight into the wind) there will be a propulsion component from the magnus force.
Just saw the cargo ship with the tiltable ones today with my own eyes. Very impressive!
Awesome. Which part of the world you are based out of?
@@marineinsight Living in Germany but currently staying in Rotterdam, Netherlands. I did a harbour tour when I saw it leaving the port.
What an amazing coincidence i just heard this name today from one of the CE and boom here's a video.😂😂 Amazing
Glad you saw this video 👍. Thanks to your CE :)
@@marineinsight Can't aerofoils, of the same width do the same job and do it better because it does not need to expend energy to spin the rotors?
So you need a motor to spin the rotors, the savings will be minimal as compared to a sail ?
Can it works in totally passive mode, like a sail?
Is not a sail more effective, in the wind-direction?
Is not more effective the using of any type of vertical wind turbine and classical propeller?
Dosent it produce extra drag..in case of no wind
Great explanation. Since shipping adds about 3 percent of total greenhouse gases this technology could be a piece of the solution
I agree it's a cool explanation.
Global warming is a double h*oax. First, the earth is not a globe, but a stationary plane. Second, the man made warming is a fallacy.
Lol funny @Perinne
Not really.
Seems to me that this wouldn't be as efficient as sails but it would be very low on maintenance, usage and cheap to install.
Do you think this will ever be put onto container ships, to increase the efficiency?
Could it also help stabilize the container ship in Highwinds?
At the time the rotors are installed on vessels which carry cargo below the deck - the wind direction and speeds above the deck are not affected by the cargo. The containers would affect the wind and make the rotors less efficient overall
So positioned vertically it would help contribute to thrust laterally. If payed down horizontal would it provide lift on the boat and work like reducing weight/displacement?
No
There are toys that fly using Magnus effect cylinders, but it's not doable for a boat.
@@joaomrtins yah I've seen pics of drones that use these like wierd looking slotted barrels instead of the standard quad prop.
Yes. But as ships are very heavy for that sort of effect hydrofoils are the better solution. However, magnus rotors could be used on airplanes. But there other challenges exist (like lift breaking down and the airplane going down, if the rotor stops rotating).
I humbly don't understand, might as well install a sail like those in traditional yachts ? Why not ? Why no ?
A traditional sail requires a lot of space on deck and manpower to handle it, as well as a lot of maintenance. These on the other hand are compact, fully automated and require little maintenance.
@@aurigo_tech Modern sailing ships are all automated. Very few need hands on controls.
Sea Zhoushan launched with 4 Rotor Sails today.. 👍
No..i think its sea zhoushan..my previous company owns it..pan ocean korea
@@dylanjoaquin9733 yes correct its zhoushan.. Thanks 👍
Good to know
How do these things hold up in rough seas?
How long before a crewman has the genius idea to ride it and is flung across the harbor?
:)
How cost tramspoting un light truck at el salvafor from vancouver BC canada
zeven fifity ,because you are my friend.
How does rotor spins, due to machine or wind?
Machine.
I am sure this has been done?!! Who has done an analysis of how much more fuel used to create the extra electricity that spins the rotor? And how much does that impinge on the fuel "savings" the rotors create?
The energy required to rotate the rotors is comparatively small. On the Buckau, Anton Flettner's original rotorship, the motors for the rotors were on the order of a few kW. Meanwhile the propulsion the rotors added to the ship equaled many hundred kW.
I wonder how this would work mounted upsidedown under water? If you had a strong cross current? Water has more force than air.
oh interesting, I think that would create too much drag though, and the water current might be moving the wrong way compared to the air.
Less fuel but add more work work to the crew
Cool... but how does it go under a bridge?
Now it is retractable
The flettner rotor, while definitely a good design for wind generated electricity would be grossly inefficient and counter productive vs traditional sails and rigging.
It’s not for wind-generated electricity. The ship’s engines turn it and the wind hitting the spinning rotor creates the Magnus effect.
Betting the "5 to 20% fuel savings" is much closer to the 5% than it is to the 20%.
For the average container ship 5% feuled savings is around 80-90,000 gallons of fuel, likely around a qtr million dollar........even if it were like 1.5-2% fuel savings it would still be economically a no brainer....
So where are the Aircraft with Cylindrical wings ?
Let's find out :)
en.wikipedia.org/wiki/Flettner_airplane
But why this is not popular n not used in all ships?
Because they cost more than they save in fuel.
@@rockydubois1052 oh😀
It is becoming more and more popular. In the last century fuel was just too cheap.
Wouldn’t the difference in air pressure pull the ship to one side?
That's what a keel is for.
@@Samahiel so it has a huge centerboard or skeg?
Best example cricket ball spinning.
Does the fuel needed to run the rotors exceed the fuel savings? And the fuel needed to carry the weight of the rotor?
It reduces the fuel consumption by 2~5%
The power required to spin the rotors in minimal (tens of kW on large ships like in the video), but the propulsion they add is on the order of hundreds of kW. Also their weight is negligible, compared to the mass of the whole ship.
Most ship owners
ain't gonna implement this
It is suitable for certain ship types only.
No one thinks un the iconvenient if been un a heavy storm with a Big column aboard?
They have been implemented on few sea going ships and none of such problem has been faced till date.
@@marineinsight i am fishermen and im study for skipper and common sense told me that high heavy weights makes the vessel unstable
@@marineinsight and you got this "information" from where?
@@breogan8121 compared to the massive cargo vessels shown here these things have very little weight
When you said rotor sail is named after that German guy, my dumb-arse thought that he's surname was 'Rotor'
😅
Do they actually have any measurable real world effect or is this just a ploy to seem hip and environmental?
Red writing on black to highlight it DOES NOT WORK
yes, this is why we are seeing more and more leisure sail boats using the rotor sail.....HAHAHAA
NOT EVEN a single pleasure sail boat.
Explained? Really? I haven't heard anyone talking yet, half way through
Fa schifo esteticamente
Why the stupid music?
Took a note of that.
The music is absolutely obnoxious. Instead of written text popping up like closed captions. A narrator speaking it would've made a much better video. Even if you (whoever made the video) doesn't have the voice for it, there's plenty of programs out there now a days that will do all the speaking for you. Thumbs down on the video for that annoyance.
Whats up with the gay music?
You like a lot?
How is music gay?