Abstract: An electric aircraft includes a forward wing and an aft wing both located on a top side of a fuselage and both having an upward dihedral angle. The forward wing has a straight or slightly forward-swept leading edge. The aft wing has a swept leading edge. A plurality of propeller engines are located on a leading-edge side of the forward wing. A single propeller engine may be located on a top side of an aft end of the fuselage; alternatively, a plurality of propeller engines are located on the aft wing on either its leading or trailing edge. The propeller engines are each powered by an electric motor. An unobstructed cargo door is located on a side of the fuselage, aft of the forward wing.

Abstract: A de-icing system for an airfoil includes a flexible skin having one or more stiffening elements embedded therein and one or more actuators positioned within the airfoil and configured to engage an impact area of the flexible skin with a displacement force. The stiffening elements extend substantially parallel to the leading edge of an airfoil and are placed in a chordwise succession proceeding away from the leading edge of the airfoil. The one or more stiffening elements are configured to transmit the displacement force to a non-impact area of the flexible skin adjacent to or near the one or more stiffening elements. The displacement force causes an outer surface of the flexible skin adjacent to the impact area to be distorted and an outer surface of the flexible skin of the non-impact area to be distorted.

Abstract: An electric aircraft includes a forward wing and an aft wing both located on a top side of a fuselage and both having an upward dihedral angle. The forward wing has a straight or slightly forward-swept leading edge. The aft wing has a swept leading edge. A plurality of propeller engines are located on a leading-edge side of the forward wing. A single propeller engine may be located on a top side of an aft end of the fuselage; alternatively, a plurality of propeller engines are located on the aft wing on either its leading or trailing edge. The propeller engines are each powered by an electric motor. An unobstructed cargo door is located on a side of the fuselage, aft of the forward wing.

Abstract: A tandem split divergent winglet for an aircraft includes a forward sail extending from an outboard end of a wing of the aircraft having a cant angle in a first direction, and an aft sail extending partially from the forward sail and partially from the outboard end of the wing. The aft sail has a cant angle in a second direction opposite the first direction. For aircraft having a low wing, the forward sail includes an upwards cant angle and the aft sail includes a downwards cant angle. For aircraft having a high wing, the forward sail includes a downwards cant angle, and the aft sail includes an upwards cant angle. Light emitted from an integrated light formed within the aft sail is blocked from reaching a cockpit window of the aircraft by the forward sail.