Assertion: sail | /r/CapableOf | act as airfoil
Facets:
value: for apparent wind angles
type: PURPOSE
value: on points of sail
type: LOCATION
Source sentences:
text: On points of sail where it is possible to align the leading edge of the sail with the apparent wind, the sail may act as an airfoil, generating propulsive force as air passes along its surface—just as an airplane wing generates lift—which predominates over aerodynamic drag retarding forward motion.
text: For apparent wind angles aligned with the entry point of the sail, the sail acts as an airfoil and lift is the predominant component of propulsion.