The aircraft according to claim 9 wherein the wing includes an inboard gull dihedral portion. An aircraft comprising:a wing with a non-movable reflexed airfoil portion, wherein: the reflexed airfoil portion includes a convergent section thickness of the underside of the wing that begins at an intermediate location between the leading edge and the trailing edge of the wing, and extends to the trailing edge of the wing, the shape of the convergent section thickness is defined by at least one reflex angle, and the slope of the at least one reflex angle is greater than or equal to zero proximate the trailing edge of the wing. The method according to claim 1 further comprising:shifting the start of the reflexed airfoil portion in front of the inlet of the nacelle to reduce spillage of subsonic airflow in the inlet. The method according to claim 3 further comprising:adjusting the reflexed airfoil portion based on nacelle shock reflections. The method according to claim 1 further comprising:initializing computational fluid dynamics iterations with an approximate reflexed airfoil portion. The method according to claim 1 further comprising:redistributing the depth of the reflexed airfoil portion such that the reflex depth is at or below a desired wing thickness curve across at least a potion of the span of the wing. The method according to claim 1 further comprising:modifying the shape of the nacelle to meet the pressure constraint. The method according to claim 1 further comprising:determining the shape of the reflexed airfoil portion along the span of the wing with and without accounting for the nacelle boundary conditions. The method according to claim 1 further comprising:determining the pressure under the reflexed airfoil portion using finite pressure difference calculations and smoothing the shape of the reflexed airfoil portion along the local Mach angle lines. A method for integrating an engine nacelle under a wing for a supersonic aircraft comprising:constraining the pressures under a reflexed airfoil portion of the wing to canceling only positive pressures, wherein the reflexed airfoil portion includes a convergent section thickness of the underside of the wing that begins at an intermediate location between the leading edge and the trailing edge of the wing, and extends to the trailing edge of the wing, and the shape of the convergent section thickness is formed with at least one reflex angle constraining the slope of the at least one reflex angle of the reflexed airfoil portion proximate the trailing edge of the wing to values greater than or equal to zero and determining the at least one slope of the reflex angle that meets the pressure and reflex angle slope constraints. A method for integrating an engine nacelle under a wing for a supersonic aircraft comprising:constraining the pressures under a reflexed airfoil portion of the wing to canceling only positive pressures, wherein the reflexed airfoil portion includes a convergent section thickness of the underside of the wing that begins at an intermediate location between the leading edge and the trailing edge of the wing, and extends to the trailing edge of the wing, and the shape of the convergent section thickness is formed with at least one reflex angle constraini.ġ. Such configurations reduce drag at the trailing edge of the wing, and the force of the positive pressure on the gull dihedral wing portion provides additional lift that partially offsets drag from the nacelle.ġ. A gull dihedral wing is designed to form a partial shroud around the nacelle. In some configurations, the reflex and/or the nacelle are shaped to maintain positive pressure under the reflexed portion of the wing, to the trailing edge of the wing. A gull dihedral wing is designed to form a part.Ī method for integrating an engine nacelle below the wing of a supersonic aircraft with low sonic boom capabilities includes determining the shape of a reflexed portion of the airfoil on the underside of the wing, and a corresponding shape for the upper surface of the nacelle to provide favorable interaction between the wing and the nacelle.
A method for integrating an engine nacelle below the wing of a supersonic aircraft with low sonic boom capabilities includes determining the shape of a reflexed portion of the airfoil on the underside of the wing, and a corresponding shape for the upper surface of the nacelle to provide favorable interaction between the wing and the nacelle.