Figure 2. A Rotor Sail produces thrust acting at a 90 degree angle from the wind direction. By reversing the direction of rotation the thrust force direction changes by 180 degrees.
WHAT KINDS OF SHIPS CAN
BENEFIT FROM ROTOR SAILS? Norsepower Rotor Sails are suitable for installation on a variety of ship types and installation is possible for both newbuilds and retrofit projects. Suitable vessel types include ro-ro ships, tankers, bulk carriers, car carriers, ferries and cruise passenger vessels.
The main technical requirements for installing a Rotor Sail on a vessel are:
• Available deck space starting from approximately 6 m x 6 m
• Sufficient size of the vessel to carry the weight and maintain the stability requirements
Figure 3. A typical polar diagram representing the main-engine equivalent power produced by two Rotor Sails for different true wind speeds and a ship speed of 17 kn (the number of each coloured line represents the corresponding true wind speed in m/s). The power produced by the rotor is given in radial direction, the angle from vertical is the true wind angle.
54 | The Report • June 2017 • Issue 80
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