AIRCRAFT SWEPT WING Russian patent published in 2025 - IPC B64C3/14 

FIELD: aviation.

SUBSTANCE: invention relates to aircraft engineering and can be used in development of wings of promising medium- and long-haul passenger aircraft. Swept wing consists of centre section, outer wings and tip and is made with elongation along base trapezium λ=12.04 taking into account tip, narrowing η=4.5 and sweep X=35°. Wing is formed from supercritical profiles, the leading edge of the wing is straight when viewed from above, the trailing edge is made with an influx and a break in the form of a rounding. Radii of wing cross-section tips related to cross-section local chord makes r_n=0.8-1.4%. Wherein the wing aerofoils centre line of up to 30% of the span by shape has a negative curvature of up to 1.7% of the chord, the profiles centre line from 30 to 50% of the span has a zero curvature of up to 45% of the chord and a positive curvature in the profile tail part, the middle line of profiles from 50 to 100% of the range has a positive curvature, which increases along chord to 2%. Wing tip has span of 7% of wing span, variable sweep Xwv=35…58°, is formed from supercritical profiles with relative thickness of 9-11%, wherein midlines of section at tip feature maximum curvature of up to 3% nearby section centre.

EFFECT: high aerodynamics and fuel efficiency at cruising flight speed in the range of Mach number M=0.84-0.86, improved takeoff-landing characteristics and characteristics in icing conditions.

1 cl, 7 dwg