Granted Patent B2

US 12,252,246 · App. 17/673,489 · Granted Mar 18, 2025

Inventors: Amar Bansal (Munich, DE); Daniel Wiegand (Munich, DE); Andreas Möbius (Wessling, DE); Sébastien Vermeiren (Munich, DE)

Assignee: Lilium eAircraft GmbH

B64C3/32B64C3/48B64D27/12B64D29/02

Abstract

Claims (23)

1. A wing assembly for an aircraft with a fuselage and at least one pair of wings, the wing assembly defining a direction of flow (F) with respect to which the wing assembly is configured to create lift for the aircraft, comprising:

a main section, which is configured to be mounted to the fuselage in a fixed manner so as to extend from the fuselage in an extension direction (W) of the wing;

a at least one flap section with a body part, which is mounted to the main section in a pivotable manner so as to be pivotable around a pivot axis (A) by means of a pivoting means over a range of angular orientations including:

a horizontal orientation in which the body part of the flap section is substantially aligned with the main section to form an elongate and substantially continuous cross-section; and

a vertical orientation in which the flap section is angled downwards with respect to the main section;

wherein the at least one flap section comprises a plurality of ducted fan engines, each ducted fan engine with a cowling, an air inlet and an air outlet which in operation is configured to produce thrust in a predetermined thrust value range;

wherein each ducted fan engine is formed in an integral manner with the body part of the flap section such that said body part constitutes a lower section of the cowling of the at least one ducted fan engine;

wherein operational conditions of the wing assembly include an angular orientation of the at least one flap section from the range of angular orientations and a thrust value produced by each ducted fan engine from the predetermined thrust value range;

wherein the main section and the at least one flap section are configured such that at least in a range of operational conditions of the wing assembly, the at least one flap section produces at least 40% of the lift of the wing assembly; and

wherein an upper section of the cowling and/or side panels of each ducted fan engine with the at least one flap section in horizontal orientation is formed with a cross section in the direction of flow (F) of the wing assembly such that the upper section of the cowling and/or side panels of the at least one ducted fan engine produces lift during operation of the engine,

wherein the upper section of the cowling having the cross section in the direction of flow (F) of the wing assembly is formed with a primarily convex curvature, comprising one half of a cambered airfoil profile,

wherein each ducted fan engine has a vertical midline, an outer surface of said upper section of the cowling achieving a peak at the vertical midline of each ducted fan engine and falling away in horizontal directions toward each side panel of the ducted fan engine, said outer surface of the upper section of the cowling of each ducted fan engine symmetrical about the vertical midline of each ducted fan engine, and

wherein a radius (R 23 ) of a leading edge nose of an upper section of the cowling normalized by its chord line length (CL) is between 1.8% and 5%, and/or the chord line length (CL) is between 600 mm to 900 mm.

2. The wing assembly according to claim 1 ,

wherein a plurality of flap sections are provided which are each individually pivotable and each comprise a single ducted fan engine.

3. The wing assembly according to claim 1 , wherein the direction of the pivot axis (A) of the at least one flap section substantially corresponds to the extension direction (W) of the wing.

4. The wing assembly according to claim 1 , wherein in a plan view of the wing assembly with the at least one flap section in horizontal orientation, the at least one flap section forms at least 40% of the total lifting surface.

5. An aircraft, comprising a fuselage, at least one pair of wing assemblies according to claim 2 , and a flight control unit for controlling the angular orientations of the flap sections and the thrust output of the ducted fan engines.

6. The aircraft according to claim 5 ,

comprising at least two pairs of wing assemblies, wherein the main section and the at least one flap section of the at least one pair of wings assemblies are configured such that at least in a range of operational conditions of the wing assembly, the flap sections of said pair of wing assemblies produce at least 40% of the total lift of all the wings of the aircraft.

7. The aircraft according to claim 5 , comprising two pairs of wing assemblies with different wingspans, wherein in a horizontal flight direction of the aircraft the pair of wings with lower wingspan is mounted in front of the other pair of wings.

8. The aircraft according to claim 5 , wherein the flap sections of a first pair of wings comprise between 30 and 50% of the total lifting surface of said first pair of wings, wherein the flap sections of a second pair of wings comprise between 50% and 70% of the total lifting surface of said second pair of wings, and/or wherein, under normal, trimmed cruise conditions of the aircraft, said flap sections of the first pair of wings contribute between 45 and 60% of the total lift of the first pair of wings, and/or the flap sections of the second pair of wings contribute between 65 and 85% of the total lift of the second pair of wings.

9. The aircraft according to claim 8 , wherein the first pair of wings comprise main wings and the second pair of wings comprise canard wings.

Assignments (3)

Priority Claims (4)

Continuity (1)

References Cited (52)