Rotary wing aircraft with a shrouded tail propeller
AssigneeAirbus Helicopters Deutschland GmbH
InventorsRupert Pfaller, Tobias Ries
Life of this patent
Estimating the term…
Abstract
A rotary wing aircraft that extends along an associated roll axis between a nose region and an aft region. The rotary wing aircraft comprises a main rotor; a propeller that is at least configured to propel the rotary wing aircraft in forward flight condition, wherein the propeller forms a circular propeller disc in rotation around an associated rotation axis; and a shrouded duct that is arranged in the aft region and that forms an inner air duct which accommodates at least partly the propeller, wherein the shrouded duct comprises a yaw and pitch stability enhancement unit for improving yaw and pitch stability of the rotary wing aircraft in the forward flight condition.
Claims20
A rotary wing aircraft that extends along an associated roll axis between a nose region and an aft region and that comprises a fuselage with a front section and a rear section, the rotary wing aircraft comprising:
- a main rotor that is at least configured to provide lift in hover condition of the rotary wing aircraft,
- a propeller that is at least configured to propel the rotary wing aircraft in forward flight condition in a forward flight direction, the propeller comprising a predetermined number of propeller blades which form a circular propeller disc in rotation of the propeller around an associated rotation axis,
- a shrouded duct that is arranged in the aft region and that forms an inner air duct which accommodates at least partly the propeller,
- wherein the rear section extends between the front section and the shrouded duct and comprises an asymmetrical cross-sectional profile in direction of the associated roll axis, the rear section being configured to generate sideward thrust for main rotor anti-torque from main rotor downwash, and
- wherein the shrouded duct comprises a yaw and pitch stability enhancement unit for improving yaw and pitch stability of the rotary wing aircraft in the forward flight condition.
A rotary wing aircraft extending along an associated roll axis between a nose and an aft region and that comprises a fuselage with a front and a rear, the rotary wing aircraft comprising:
- a main rotor configured to provide lift in hover condition of the rotary wing aircraft,
- a propeller configured to propel the rotary wing aircraft in forward flight condition in a forward flight direction, the propeller comprising a plurality of propeller blades forming a circular propeller disc in rotation of the propeller around an associated rotation axis,
- a shrouded duct arranged in the aft region and that forms a ring-shaped inner air duct which accommodates at least partly the propeller,
- wherein the rear extends between the front and the shrouded duct and comprises an asymmetrical cross-sectional profile along the associated roll axis in the direction of the associated roll axis, the rear being configured to generate sideward thrust for main rotor anti-torque from main rotor downwash, and
- wherein the shrouded duct comprises a yaw and pitch stability enhancement unit mounted to the shrouded duct for improving yaw and pitch stability of the rotary wing aircraft in the forward flight condition.
A rotary wing aircraft that extends along a roll axis between a nose region and an aft region and comprises a fuselage with a front section and a rear section, the rotary wing aircraft comprising:
- a main rotor to provide lift in hover condition of the rotary wing aircraft,
- a propeller to propel the rotary wing aircraft in forward flight condition in a forward flight direction, the propeller comprising propeller blades which form a circular propeller disc in rotation of the propeller around one rotation axis,
- a closed shrouded duct arranged in the aft region and that forms a closed inner air duct which accommodates at least partly the propeller,
- wherein the rear section extends between the front section and the shrouded duct and comprises an asymmetrical cross-sectional profile in direction of the roll axis, the rear section to generate sideward thrust for main rotor anti-torque from main rotor downwash, and
- wherein the shrouded duct comprises a yaw and pitch stability enhancement unit for improving yaw and pitch stability of the rotary wing aircraft in the forward flight condition.
Dependencies are inferred from the claim text.