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36 D. ÖZTÜRK and H. AKYILDIZ

Figure 3. Principle of Magnus effect [4].

Also, electromechanical system makes it possible to change rotation speed and direction of
rotation so as to increase efficiency. Additively, placing the rotor horizontal to the sea level
increases the capacity of roll motion damping due to moment arm difference in comparison with
fin systems [5]. Quantum Maglift Company, see Figure 4, has designed rotor swing systems that
have different kind of technical properties for the purpose of maximizing efficiency at various
sizes of ships [6].

Figure 4. The ML200 Series hull unit designed for 27-35 m vessel length.

The rotors of the system are folded into the streamline of the water under the hull to decreasing
speed loss and friction. Location of the rotors on the hull has an importance for efficiency, so
rotors are placed almost totally in the turbulent boundary layer of the vessel. Also, manual
override hand wheel can be seen mounted on the side of the swivel motor. Microprocessor
technology is used to operating the system and allows to read the inclination angles for better
performance.
Owing to the fact that system keeps the vessel on the level, cruise comfort and safety are
paramount to engineers and it is concluded that:

 System has the benefit of providing more performance underway at slow speeds where
fins would not be useful because of the enlarged fin size working at slower speeds. The
longitudinal location of the rotors is also further flexible than traditional fins, letting the
rotors to be located more forward or closer to the stern.

GiDB|DERGi Sayı 7, 2016