for use in combination with other propulsion means, e.g. for improved fuel economy

Marine propulsion provided directly by wind power > using sails or like wind-catching surfaces > Types of sail; Constructional features of sails; Arrangements thereof on vessels > Kite-sails for vessels > for use in combination with other propulsion means, e.g. for improved fuel economy

Marine propulsion provided directly by wind power (wind-motors driving underwater propulsive elements B63H13/00) > using sails or like wind-catching surfaces (sail or rigging arrangements specially adapted for water sports boards, e.g. for windsurfing or kitesurfing B63H8/00) > Types of sail; Constructional features of sails; Arrangements thereof on vessels > Kite-sails for vessels > for use in combination with other propulsion means, e.g. for improved fuel economy