Lift-changing mechanism

A lift-changing mechanism configured to change lift generated by a wing of an aircraft, the lift-changing mechanism comprising:

• a slit that extends in a wingspan direction inside the wing and that forms openings on a lower surface of the wing and on an upper surface of the wing respectively, the slit being a slit through which a part of airflow below the lower surface is allowed to flow toward the upper surface;
• and
• an opening and closing member configured to open and close the slit,
• wherein the opening and closing member is configured to rotate around an axis and includes a shape of which a radius from the axis to an outer edge of the opening and closing member is not constant,
• wherein the opening and closing member is configured to alternately repeat, by rotating in one rotational direction around the axis, a first state that the opening and closing member opens the slit and a second state that the opening and closing member closes the slit,
• wherein the opening and closing member is provided in a gap, the gap is provided within an interior of the wing between the lower surface of the wing and the upper surface of the wing, and
• wherein a front end of the gap is defined by a wall provided within the interior of the wing, closer to a trailing edge of the wing than to a leading edge of the wing.