AIRCRAFT WINGTIP Russian patent published in 2017 - IPC B64C23/06 

FIELD: aviation.

SUBSTANCE: crescent-shaped aircraft wingtip has a front and back edges made of non-linear shape, convex along the entire length, consists of profiles with a curvature (f=0.005-0.02), which is increased in relation to the end section of the wing, with a smaller relative thickness (c=5-15%) and large negative values of the twist angles (ε=5-25%). The tail part of the tip is made with a deviation of the vertex coordinate backstream from the rear edge of the wing by a distance (0.5-0.7) b_t, where b_t is the tip chord of the wing.

EFFECT: increased aerodynamic quality of the aircraft and improved fuel efficiency.

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