same year. Variants T-18 Original model T-18W Modified T-18, with changes designed by Lou Sunderland to provide a 2" (5 cm) wider fuselage. T-18C Modified T-18, with changes designed by Lou Sunderland to provide a "convertible" wing that rotates back against the fuselage for trailering or storage. T-18CW T-18 with wider fuselage and folding wing. S-18 Similar to T-18CW, with modified airfoil and other minor changes. The Sunderland changes were made in collaboration with Thorp. S-18T Tricycle landing gear version Specifications (S-18 with Lycoming O-360) See also References Homebuilt aircraft 1960s United States civil utility aircraft Low-wing aircraft Single-engined tractor aircraft Aircraft first flown in 1963