S-foils

S-foils, also known as swing-wings, strike foils, stability foils, stabilizer foils starfoils and, on occasion, as X-foils, were movable wings attached to the port and starboard sides of a starship, sometimes mounted with weaponry. Normally, the foils were locked in a "closed" position close to the ship for landing and usually for normal flight, but during high-stress situations, the foils were folded out. The Incom Corporation manufactured several starfighters with S-foils, including the ARC-170 starfighter and, later, the X-wing starfighter.

Text and facts from the “S-foils/Legends” article on Wookieepedia, licensed under CC BY-SA 3.0. Modified for this site.