Assertion: sail | /r/CapableOf | generate propulsive force
Facets:
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: Sails are unable to generate propulsive force if they are aligned too closely to the wind.