A tiltrotor aircraft having a vertical takeoff and landing flight mode and a forward flight mode, the aircraft comprising: a longitudinally extending fuselage; a wing extending laterally from the fuselage, the wing having first and second oppositely disposed wing tips (14c, 14d) at first and second ends of the wing that are distal from the fuselage; first and second tip booms (16a, 16b) respectively coupled to the first and second ends of the wing distal from the fuselage and extending longitudinally from the first and second wing tips (14c, 14d), the first and second tip booms (16a, 16b) each having forward and aft ends (18a, 18b, 20a, 20b); first and second forward rotors (28a, 28b) respectively coupled to the forward ends (18a, 18b) of the first and second tip booms (16a, 16b), the first and second forward rotors (28a, 28b) reversibly tiltable between a vertical lift orientation, wherein the first and second forward rotors (28a, 28b) are above the respective first and second tip booms (16a, 16b), and a forward thrust orientation, wherein the first and second forward rotors (28a, 28b) are forward of the respective first and second tip booms (16a, 16b); and first and second aft rotors (28c, 28d) respectively coupled to the aft ends (20a, 20b) of the first and second tip booms (16a, 16b), the first and second aft rotors (28c, 28d) reversibly tiltable between a vertical lift orientation, wherein the first and second aft rotors (28c, 28d) are below the respective first and second tip booms (16a, 16b), and a forward thrust orientation, wherein the first and second aft rotors (28c, 28d) are aft of the respective first and second tip booms (16a, 16b). a longitudinally extending fuselage; a wing extending laterally from the fuselage, the wing having first and second oppositely disposed wing tips (14c, 14d) at first and second ends of the wing that are distal from the fuselage; first and second tip booms (16a, 16b) respectively coupled to the first and second ends of the wing distal from the fuselage and extending longitudinally from the first and second wing tips (14c, 14d), the first and second tip booms (16a, 16b) each having forward and aft ends (18a, 18b, 20a, 20b); first and second forward rotors (28a, 28b) respectively coupled to the forward ends (18a, 18b) of the first and second tip booms (16a, 16b), the first and second forward rotors (28a, 28b) reversibly tiltable between a vertical lift orientation, wherein the first and second forward rotors (28a, 28b) are above the respective first and second tip booms (16a, 16b), and a forward thrust orientation, wherein the first and second forward rotors (28a, 28b) are forward of the respective first and second tip booms (16a, 16b); and first and second aft rotors (28c, 28d) respectively coupled to the aft ends (20a, 20b) of the first and second tip booms (16a, 16b), the first and second aft rotors (28c, 28d) reversibly tiltable between a vertical lift orientation, wherein the first and second aft rotors (28c, 28d) are below the respective first and second tip booms (16a, 16b), and a forward thrust orientation, wherein the first and second aft rotors (28c, 28d) are aft of the respective first and second tip booms (16a, 16b).