Thrust vectoring propulsor
A two-dimensionally gimballed propeller produces vectored thrust. A directional propeller generates a two-dimensional propulsive thrust vector without adverse moments or translational forces. Forces necessary to control the propulsive vector are minimized by directing the vector through the propeller's aerodynamic center apart from the power source delivered to the propeller via a driveshaft having a fixed orientation.
1. A system for a directional thrust propeller, the system comprising:
a propeller assembly wherein the propeller assembly includes an aerodynamic center;
a Constant Velocity (CV) joint coupling a drive shaft to the propeller assembly wherein CV joint is collocated with the aerodynamic center of the propeller assembly; and
an outboard strut interposed between the propeller assembly and a pivot interface, wherein the outboard strut is configured to convey a load generated by the propeller assembly to the pivot interface and wherein the outboard strut and thereby the propeller assembly is rotatably coupled at the pivot interface, the pivot interface defining a propeller pivot axis extending through the aerodynamic center.
2. The system for a directional thrust propeller according to claim 1 , wherein the propeller assembly is housed within a propeller duct and wherein the propeller duct includes the pivot interface.
3. The system for a directional thrust propeller according to claim 2 , further comprising a gimbal assembly wherein the gimbal assembly includes a gimbal pivot interface defining a propeller gimbal pivot axis extending through the aerodynamic center.
4. The system for a directional thrust propeller according to claim 3 , wherein the propeller duct is rotatably coupled within the gimbal assembly at the pivot interface.
5. The system for a directional thrust propeller according to claim 4 , wherein the gimbal assembly is rotatable about the propeller gimbal pivot axis independent of the propeller duct being rotatable about the propeller pivot axis.
6. The system for a directional thrust propeller according to claim 3 , wherein the gimbal pivot axis and the propeller pivot axis are perpendicular.
7. The system for a directional thrust propeller according to claim 2 , further comprising a main bearing interposed between the propeller assembly and the outboard strut configured to convey the load generated by the propeller assembly to the outboard strut.
8. The system for a directional thrust propeller according to claim 1 , wherein the load include a thrust load and radial load.
9. The system for a directional thrust propeller according to claim 8 , further comprising an inboard strut interposed between the propeller assembly and the propeller duct, the inboard strut configured to convey the radial load generated by the propeller assembly to the propeller duct.
10. The system for a directional thrust propeller according to claim 9 , further comprising a secondary bearing interposed between the propeller assembly and the inboard strut.
11. The system for a directional thrust propeller according to claim 2 , wherein the propeller assembly includes a plurality of propeller blades and wherein each propeller blade includes a blade root, a blade tip, a blade main body, and a trailing edge assembly and wherein each trailing edge assembly spans from the propeller root to up to a position short of the blade tip.
12. The system for a directional thrust propeller according to claim 11 , wherein the trailing edge assembly of each propeller blade is configured to modify collectively camber of each propeller blade thereby varying the load of the propeller assembly independent of a propeller assembly rotational velocity.
13. The system for a directional thrust propeller according to claim 1 , wherein the CV joint is a tripod joint.
14. The system for a directional thrust propeller according to claim 1 , wherein the outboard strut includes movable vanes configured to counter gyroscopic precession.
15. A method for producing directional thrust, the method comprising:
interposing an outboard strut between a propeller assembly and a pivot interface wherein the outboard strut is configured to convey a load generated by the propeller assembly to the pivot interface and wherein the propeller assembly includes an aerodynamic center;
rotatably coupling the outboard strut at the pivot interface defining a propeller pivot axis extending through the aerodynamic center;
coupling the propeller assembly to a drive shaft by a Constant Velocity (CV) joint wherein CV joint is collocated with the aerodynamic center of the propeller assembly; and
rotating the propeller assembly about the propeller pivot axis, the load generated by the propeller assembly directed through the aerodynamic center.
16. The method for directional thrust according to claim 15 , further comprising housing the propeller assembly within a propeller duct.
17. The method for directional thrust according to claim 16 , further comprising rotatably coupling the propeller duct within a gimbal assembly at the pivot interface wherein the gimbal assembly includes a gimbal pivot interface defining a propeller gimbal pivot axis extending through the aerodynamic center.
18. The method for directional thrust according to claim 17 , further comprising rotating the gimbal assembly about the propeller gimbal pivot axis independent of rotating the propeller duct about the propeller pivot axis.
19. The method for directional thrust according to claim 16 , wherein the gimbal pivot axis and the propeller pivot axis are perpendicular.
20. The method for directional thrust according to claim 16 , further comprising interposing a main bearing between the propeller assembly and the outboard strut thereby conveying the load generated by the propeller assembly to the outboard strut.
21. The method for directional thrust according to claim 16 , further comprising interposing an inboard strut between the propeller assembly and the propeller duct thereby conveying a radial load generated by the propeller assembly to the propeller duct.
22. The method for directional thrust according to claim 21 , further comprising interposing a secondary bearing between the propeller assembly and the inboard strut.
23. The method for directional thrust according to claim 16 , further comprising interposed a main bearing between the propeller assembly and the outboard strut thereby conveying the load generated by the propeller assembly to the outboard strut.
24. The method for directional thrust according to claim 15 , wherein the propeller assembly includes a plurality of propeller blades and wherein each propeller blade includes a blade root, a blade tip, a blade main body, and a trailing edge assembly and wherein each trailing edge assembly spans from the propeller root to up to a position short of the blade tip and further comprising collectively extending the trailing edge assemble of each propeller blade thereby varying the load of the propeller assembly independent of a propeller assembly rotational velocity.
25. The method for directional thrust according to claim 16 , wherein the outboard strut includes movable vanes and further comprising positioning the movable vanes to counter gyroscopic precession.