The invention discloses a retractable airfoil-shaped sail with double tail flaps. A sail body assembly comprises a main sail at the front part, a front tail flap airfoil sail in the middle, and a rear tail flap airfoil sail at the rear part; the lower end of a front sail mast is connected to a base, and track cars are respectively and correspondingly connected to the lower ends of a middle sail mast and a rear sail mast; an engine is connected with the lower end of the front sail mast through a pair of meshed gears, and each the lower ends of the middle sail mast and the rear sail mast is connected to a corresponding rotating motor through a pair of corresponding meshed gears. When the sail is furled, the front tail flap airfoil sail is tightly attached to the variable-curvature concave arc surface on the main sail through the variable-curvature airfoil surface of the front tail flap airfoil sail, and the rear tail flap airfoil sail is tightly attached to the variable-curvature concave arc surface on the front tail flap airfoil sail through the variable-curvature airfoil surface of the rear tail flap airfoil sail; when the sail is unfurled, front and rear transverse gaps are reserved between the main sail and the front tail flap airfoil sail, as well as between the front tail flap airfoil sail and the rear tail flap airfoil sail, so that the high-pressure airflow on a lower sail surface flows to an upper sail surface through the gaps; the separation of the airflow can be postponed, and the aerodynamic performance of the sail can be improved.
Retractable airfoil-shaped sail with double tail flaps
2015-09-23
Patent
Elektronische Ressource
Englisch
IPC: | B63H Schiffsantrieb oder Steuerung der Schiffe , MARINE PROPULSION OR STEERING |