Magnus effect rotary sail propels cruise ship - GIF

[Jon]

Magnus effect rotary sail propels cruise ship.




Previously:

Flettner aircraft - photo
Model boat with numerous sails - photo
Lightning hits sailboat - GIF
Glider with sails - photo

[Karl_H]

If you happen to be watching any of the Major League Baseball playoff games, consider that the Magnus Effect that is propelling this cruise ship is the same force that causes a spinning baseball to curve or slide!

[mwmkravchenko]

Wonder what the true use of this is? Because one of these is definitely not moving a cruise ship at that speed.

I remember reading about something like this in the late 70 in Popular Science magazine.

What's old is new.

[IAMSatisfied]

Help me out here... is the wind spinning the rotary sail, and that energy is being used to assist the diesel motor(s) drive the propeller(s)?

[Karl_H]

first introduced in 1925 - what's really old in new.
Now used to supplement the diesel engines, providing power much like a standard sail, but able to point higher into the wind.

As I understand, the rotors are spun by an independent source and the Magnus effect of the wind hitting a spinning object provides the lift to help propel the boat.

[greyhoundollie]

I have a house down in Baja California. In the mid 1980's Jaques Cousteau made one of his trips there in the Sea of Cortez in a boat with two of these Magnus rotary sails. I think at that time they were refereed to by an older name called a " corturoy". The boat was about 45 ft long. As I understood it, The boat used Diesel engine propeller and the rotary sails added about 40% to the overall power. He said that the boat could sail without the engine but the combination of the 2 was much more efficient to access the power of the rotary sails. The speed the boat got from the engine made the "wind" that the rotaries operated in a faster wind and that increased the "pull" of the rotary sail.

[DIYSwede]

"The cylindrical rotor sail installed on M/S Viking Grace is 24 m in height and 4 m in diameter and it uses the
Magnus effect for propulsion. As the rotor is spinning, the passing air will flow with a lower pressure on one
side than the opposite side. The propulsion force created by this pressure difference will drive the vessel
forward. The rotor sail operation is automated and the system will shut down in response to any
disadvantageous changes in the direction or force of the wind. The rotor sail will reduce the vessel’s carbon
dioxide emissions by up to 900 tonnes per year, depending on the wind conditions."

1 min vid, eng subtitles:
https://drive.google.com/file/d/1JTl...0MyXQRsHL/view