Method for transporting a payload to a target location, and related hybrid airship

1. A method for transporting a payload to a target location comprising:

providing a hybrid airship comprising a buoyancy enclosure containing a gas lighter than air, the buoyancy enclosure having a longitudinal axis, the hybrid airship comprising a gondola carried by the buoyancy enclosure and a payload connected to said buoyancy enclosure, at least one propeller configured to generate a force when rotated around a propeller axis, a controller controlling an orientation of the at least one propeller with regard to the buoyancy around at least one axis to modify the orientation of the force generated by the at least one propeller, and at least one rudder protruding from the buoyancy enclosure and at least a tilting controller able to control the rudder to modify the a pitch angle of the hybrid airship; and

flying the hybrid airship carrying the payload to the target location, wherein flying the hybrid airship carrying the payload comprises generating a lift force with the at least one propeller and comprises tilting the longitudinal axis of the buoyancy enclosure to a positive pitch, by controlling the rudder, to generate an aerodynamic lift force when the hybrid airship carrying the payload moves longitudinally at a first target altitude,

before flying the hybrid airship carrying the payload to the target location:

flying the hybrid airship to the payload and connecting the payload carrier to the payload; and

lifting the payload;

after flying the hybrid airship carrying the payload to the target location, descending the hybrid airship and the payload to drop the payload at the target location;

if the longitudinal axis is transversely offset of the exact target location, rotating the at least one propeller around a first pivot axis perpendicular to the propeller axis so that said propeller axis tilts with respect to an axis parallel to the longitudinal axis and generates a transverse moving force, and

after dropping the payload at the target location, flying back the hybrid airship without a payload, or with a payload such that the combined hybrid airship plus payload has a buoyancy lighter than air, wherein flying back the hybrid airship comprises tilting the longitudinal axis of the buoyancy enclosure, by controlling the rudder, to a negative pitch to generate an aerodynamic descent force when the hybrid airship moves longitudinally at a second target altitude.

2. The method according to claim 1 , wherein the positive pitch is greater than 0.5°.

3. The method according to claim 1 , wherein flying back the hybrid airship comprises generating a descent force with the at least one propeller.

4. The method according to claim 1 , wherein flying the hybrid airship to the payload comprises generating a lift force with the at least one propeller to lift the airship to a target altitude.

5. The method according to claim 4 , wherein flying the hybrid airship to the payload comprises, after reaching the target altitude, tilting the longitudinal axis of the buoyancy enclosure to a negative pitch to generate an aerodynamic descent force when the hybrid airship moves longitudinally.

6. The method according to claim 1 , wherein flying the hybrid airship carrying the payload to the target location comprises actuating the controller controlling the orientation of the at least one propeller to generate a force having a component transverse to the longitudinal axis to transversally adjust a position of the longitudinal axis of the buoyancy enclosure with respect to the target location.

7. The method according to claim 6 , wherein the controller controlling the orientation of the at least one propeller comprises the first pivot axis of the at least one propeller with regard to the buoyancy enclosure which is at least substantially vertical when the propeller axis is horizontal, and wherein the controller controlling the orientation of the at least one propeller rotates the at least one propeller around the first pivot axis to generate the force having a component transverse to the longitudinal axis.

8. The method according to claim 6 , wherein the controller controlling the orientation of the at least one propeller comprises a second pivot axis of the at least one propeller with regard to the buoyancy enclosure which is at least substantially horizontal when the longitudinal axis is horizontal, and wherein the controller controlling the orientation of the at least one propeller rotates the at least one propeller around the second pivot axis to generate the lift force.

9. The method according to claim 8 , wherein the first pivot axis is rotatable around the second pivot axis, and wherein rotating the at least one propeller around the second pivot axis generates a rotation of the first pivot axis around the second pivot axis.

10. The method according to claim 6 , wherein the transverse adjustment of the position of the longitudinal axis is carried out without longitudinally moving the hybrid airship.

11. The method according to claim 2 , wherein the positive pitch is between 0.5° and 15°.

12. The method according to claim 11 , wherein the positive pitch is between 0.5° and 5°.

13. The method according to claim 1 , wherein the hybrid airship moves longitudinally, with substantially no upward or downward movement.

14. A hybrid airship for transporting a payload to a target location, comprising:

a buoyancy enclosure containing a gas lighter than air, the buoyancy enclosure having a longitudinal axis;

a gondola carried by the buoyancy enclosure;

a payload carrier connected to said buoyancy enclosure;

at least one propeller comprising at least a blade able to generate a force when rotated around a propeller axis;

a controller controlling an orientation of the at least one propeller with regard to the buoyancy enclosure around at least one axis to modify the orientation of the generated force, the controller controlling the orientation of the at least one propeller being able to control the orientation of the at least one propeller to generate a lift force with the at least one propeller when flying the hybrid airship carrying the payload;

said controller being further able to control rotating the at least one propeller around a first pivot axis perpendicular to the propeller axis so that said propeller axis tilts with respect to an axis parallel to the longitudinal axis and generates a transverse moving force;

at least one rudder protruding from the buoyancy enclosure; and

a tilting controller configured to:

tilt the longitudinal axis of the buoyancy enclosure to a positive pitch, by controlling the rudder, to generate an aerodynamic lift force when the hybrid airship carrying the payload moves longitudinally, at a first target altitude, and

tilt the longitudinal axis of the buoyancy enclosure to a negative pitch, by controlling the rudder, to generate an aerodynamic descent force when the hybrid airship moves longitudinally, at a second target altitude, without a payload or with a payload such that the combined hybrid airship plus payload has a buoyancy lighter than air.

15. The hybrid airship according to claim 14 , wherein the controller controlling the orientation of the at least one propeller is able to control the orientation of the at least one propeller to generate a force having a component transverse to the longitudinal axis to transversally adjust a position of the longitudinal axis of the enclosure with respect to the target location.

16. The hybrid airship according to claim 15 , wherein the controller controlling the orientation of the at least one propeller comprises the first pivot axis of the at least one propeller with regard to the buoyancy enclosure which is at least substantially vertical when the propeller axis is horizontal, the controller controlling the orientation of the at least one propeller being able to rotate the at least one propeller around the first pivot axis to generate the force having a component transverse to the longitudinal axis.

17. The hybrid airship according to claim 14 , wherein the hybrid airship carrying the payload moves longitudinally, with substantially no upward or downward movement.