https://www.greencarcongress.com/2019/08/20190818-scandlines.html
[image and link in online article]
Scandlines installing Norsepower’s rotor sail solution on board hybrid ferry
18 August 2019
Ferry operator Scandlines signed an agreement with Norsepower Oy Ltd,
leading clean technology and engineering company pioneering modern wind
propulsion technology, to install Norsepower’s Rotor Sail Solution on
board the M/V Copenhagen, a hybrid passenger ferry.
Operating between Rostock in Germany and Gedser in Denmark, the M/V
Copenhagen belongs to the world’s largest fleet of hybrid ferries, which
combines diesel and battery power. Since 2013, Scandlines has invested
more than €300 million in building and retrofitting ferries from
conventional diesel-driven to hybrid ferries. With the addition of
Norsepower’s technology, the vessel will further reduce its emissions.
The Norsepower Rotor Sail Solution is a modernized version of the
Flettner rotor (earlier post)—a spinning cylinder that uses the Magnus
effect—a commonly observed effect in which a spinning ball or cylinder
in this case curves away from its principal path to harness wind power
to thrust a ship.
The Magnus effect observes that a revolving body moving relatively to a
surrounding fluid—in this case, air—is subjected not only to drag, but
also to lift. As the speed of the cylinder—spinning at right angles to
the flow—increases, the pressure decreases on the side of the cylinder
where the natural flow and the spin-induce flow combine. The decrease in
pressure generates lift, and the lift increases as the surface velocity
increases (per Bernoulli’s theorem).
The thrust induced by the Magnus effect can be utilized in ship
propulsion by placing a cylinder on the open deck of the vessel and by
rotating it around its vertical axis. A variable electric drive system,
which is powered by the ship's low voltage network, is used for rotation
of the Rotor Sail.
The Norsepower Rotor Sail is the first data-verified and commercially
operational auxiliary wind propulsion technology for the global maritime
industry. When wind conditions are favorable, it enables the electric
propulsion thrusters and center propel to be throttled back, reducing
emissions, while providing the power needed to maintain speed and voyage
time. Because it generates supplementary thrust from wind, the solution
is compatible with all other emissions saving technologies.
The route between Gedser to the north and Rostock to the south is almost
perpendicular to the prevailing wind from west giving Scandlines
favorable conditions for using Rotor Sails on the ferry crossing.
Preparations for the retrofit will take place in November 2019 with the
installation scheduled for Q2 2020. M/V Copenhagen is set to be
retrofitted with one large-sized Norsepower Rotor Sail unit that is 30m
in height and 5m in diameter.
By installing a Rotor Sail, we can reduce CO2 emissions on the
Rostock-Gedser route by four to five per cent.
—Scandlines CEO Søren Poulsgaard Jensen
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