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An assembly of an internal combustion motor together with its cooling and ventilating equipment all faired within the normal contour of an aeroplane wing in such a way that no projections extend therefrom, comprising a fuselage, a wing, means to form a motor compartment bounded on its upper side by a portion of the upper surface of the wing next to the fuselage, said motor compartment being bounded on its lower side by a portion of the lower surface of the wing, a hatch removably separating said motor compartment from the fuselage, louvers formed in a portion of the lower surface of the wing that also forms the lower wall of said motor compartment, said louvers being arranged to draw air downward out of the compartment when the aero‐plane is in normal horizontal flight, whereby fumes that may escape from the motor may bo drawn away from the fuselage and whereby any movement of air past said hatch may be toward the louvers, an intake connexion for cooling air in the bottom wall of the compartment, a casing extending from said intake opening and extending to and enclosing the combustion‐chamber portion of the motor, said casing also extending from said enclosing portion toward the trailing edge of the wing to an opening in the top surface of the wing, and an exhaust con‐nexion extending from said combustion‐chamber portion of the motor to said opening in the top surface of the wing.