Rotorcraft with a tail boom having a duct-type portion

A rotorcraft comprising:

• a main rotor;
• a fuselage;
• a tail boom connected to the fuselage and extending longitudinally from the fuselage toward a duct-type portion;
• a shroud at the duct-type portion and defining a transverse duct comprising a circumferential direction and a longitudinal extension oriented at least essentially perpendicular to the circumferential direction and the longitudinal direction of the tail boom;
• and
• a ducted tail rotor rotatably arranged in the transverse duct;
• wherein the shroud comprises a first section connected to the tail boom and a second section spaced apart from the tail boom and opposed to the first section, the first section comprising an airfoil aerodynamic profile, and wherein the transverse duct comprises a depth oriented at least essentially in parallel to the longitudinal extension of the transverse duct, and wherein the depth varies along the circumferential direction of the transverse duct.

A rotorcraft comprising:

• a main rotor;
• a fuselage;
• a tail boom extending from the fuselage toward a duct;
• a shroud at the duct defining a transverse duct having a circumferential direction and a longitudinal extension;
• and
• a ducted tail rotor rotatably arranged in the transverse duct;
• the shroud comprising a first section connected to the tail boom and a second section spaced from the tail boom opposed to the first section, the first section having an aerodynamic profile;
• wherein the transverse duct comprises a depth that varies along the circumferential direction of the transverse duct.