# US 10,870,488 B2 · Braced wing aircraft > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,870,488 B2 - Document ID: US10870488B2 - Status: Granted - Kind: B2 - Application number: 16/154,010 - Filed: 2018-10-08 - Published: 2019-05-23 - Granted: 2020-12-22 - Earliest claimed: 2017-11-20 - Assignees: Airbus Helicopters Deutschland GmbH - Applicants: Airbus Helicopters Deutschland GmbH - Inventors: Martin Blacha; Axel Fink - Web page: https://patentgrep.com/patent/US10870488B2 ## CPC - B64C 39/068: {having multiple wings joined at the tips} - B64C 3/185: {Spars} - B64C: AEROPLANES; HELICOPTERS ## Abstract A braced wing aircraft with a fuselage and a fixed wing arrangement, the fixed wing arrangement comprising at least two braced wings that are arranged laterally and opposite to each other on the fuselage, each one of the at least two braced wings comprising at least one upper wing and at least one lower wing which are staggered and interconnected at a predetermined transition region, the at least one upper wing being connected to the fuselage at an associated upper wing root and the at least one lower wing being connected to the fuselage at an associated lower wing root. ## Claims ### Claim 1 A braced wing aircraft with a fuselage and a fixed wing arrangement, the fixed wing arrangement comprising at least two braced wings that are arranged laterally and opposite to each other on the fuselage, each one of the at least two braced wings comprising at least one upper wing and at least one lower wing which are staggered and interconnected at a predetermined transition region, the at least one upper wing being connected to the fuselage at an associated upper wing root and the at least one lower wing being connected to the fuselage at an associated lower wing root, wherein the at least one upper wing comprises at least one upper wing spar that extends from the associated upper wing root to the predetermined transition region, and wherein the at least one lower wing comprises at least one lower wing spar that extends from the predetermined transition region to the associated lower wing root, wherein at least one transition spar is provided at the predetermined transition region, the at least one transition spar connecting the at least one upper wing spar to the at least one lower wing spar, and wherein the at least one upper wing spar, the at least one lower wing spar, and the at least one transition spar are arranged in a single spars plane that is inclined relative to a vertical aircraft axis. ### Claim 2 (depends on 1) The braced wing aircraft of claim 1, wherein the at least one upper wing spar, the at least one lower wing spar, and the at least one transition spar are integrated into a single one-piece component. ### Claim 3 (depends on 1) The braced wing aircraft of claim 1, wherein the at least one transition spar is integrated into only one of the at least one upper wing spar and the at least one lower wing spar into a single one-piece component. ### Claim 4 (depends on 1) The braced wing aircraft of claim 1, wherein the at least one upper wing spar and the at least one lower wing spar are rigidly mechanically attached to the at least one transition spar. ### Claim 5 (depends on 1) The braced wing aircraft of claim 1, wherein the at least one upper wing and the at least one lower wing respectively comprise a chord line, wherein the single spars plane is inclined with respect to the chord line. ### Claim 6 (depends on 1) The braced wing aircraft of claim 1, wherein the at least one upper wing comprises an upper wing rear spar and an upper wing front spar, the at least one lower wing comprises a lower wing rear spar and a lower wing front spar, and the at least one transition spar comprises a rear transition spar and a front transition spar. ### Claim 7 (depends on 6) The braced wing aircraft of claim 6, wherein the upper wing rear spar, the lower wing rear spar and the rear transition spar are arranged in a single rear spars plane that is inclined relative to the vertical aircraft axis, and the upper wing front spar, the lower wing front spar and the front transition spar are arranged in a single front spars plane that is inclined relative to the vertical aircraft axis. ### Claim 8 (depends on 7) The braced wing aircraft of claim 7, wherein the single virtually spanned rear spars plane and the single virtually spanned front spars plane are arranged in parallel to each other. ### Claim 9 (depends on 7) The braced wing aircraft of claim 7, wherein the single rear spars plane and the single front spars plane are inclined with respect to each other. ### Claim 10 (depends on 6) The braced wing aircraft of claim 6, wherein the upper wing rear spar, the lower wing rear spar, the rear transition spar, the upper wing front spar, the lower wing front spar, and the front transition spar delimit a main load carrying center box of an associated one of the at least two braced wings. ### Claim 11 (depends on 10) The braced wing aircraft of claim 10, wherein the associated one of the at least two braced wings further comprises a leading portion and a trailing portion both of which are rigidly attached to the main load carrying center box. ### Claim 12 (depends on 10) The braced wing aircraft of claim 10, wherein the upper wing rear spar, the lower wing rear spar, the rear transition spar, the upper wing front spar, the lower wing front spar, and the front transition spar are flat beams with closed webs. ### Claim 13 (depends on 12) The braced wing aircraft of claim 12, wherein the front transition spar and the rear transition spar are entirely or partially ring-shaped. ### Claim 14 (depends on 1) The braced wing aircraft of claim 1, wherein a propulsion device is arranged at the predetermined transition region. ### Claim 15 (depends on 1) The braced wing aircraft of claim 1, wherein being embodied as a rotary wing aircraft with at least one main rotor. ### Claim 16 A braced wing aircraft with a fuselage and a fixed wing arrangement, the fixed wing arrangement comprising at least two braced wings that are arranged laterally and on opposite sides of the fuselage, each one of the at least two braced wings comprising an upper wing and a lower wing which are staggered and interconnected at a predetermined transition region, the upper wing connected to the fuselage at an associated upper wing root and the lower wing connected to the fuselage at an associated lower wing root, the upper wing comprising an upper wing spar extending from the associated upper wing root to the predetermined transition region, and the lower wing comprising a lower wing spar extending from the predetermined transition region to the associated lower wing root, the predetermined transition region having a transition spar connecting the upper wing spar to the lower wing spar, wherein the upper wing spar, the lower wing spar, and the transition spar are arranged in a single spars plane that is inclined relative to a vertical aircraft axis. ### Claim 17 (depends on 16) The braced wing aircraft of claim 16, wherein the upper wing and the lower wing respectively comprise a chord line, wherein the single spars plane is inclined relative to the chord line, and wherein the upper wing spar and the lower wing spar are rigidly mechanically attached to the transition spar. ### Claim 18 (depends on 16) The braced wing aircraft of claim 16, wherein the upper wing spar, the lower wing spar, and the transition spar are integrated into a single one-piece component. ### Claim 19 (depends on 16) The braced wing aircraft of claim 16, wherein the transition spar is integrated into only one of the upper wing spar and the lower wing spar into a single one-piece component.