Spacecraft afterbody device

1. An afterbody device for a spacecraft vehicle having a fuselage and fitted with at least one rocket engine at a rear of the vehicle, the afterbody device comprising movable cover elements, wherein said movable cover elements:

are capable of taking a first position masking the rear of the vehicle and reducing a rear drag of the vehicle, where the cover elements prolong the vehicle's fuselage,

extend beyond the rear of the vehicle's fuselage and cover a rocket engine nozzle of the vehicle, and

are capable of taking a second position fully deployed, increasing an aerodynamic drag of the vehicle.

2. The spacecraft afterbody device of claim 1 , wherein the cover elements prolonging the vehicle's fuselage are hinged on said fuselage.

3. The spacecraft afterbody device of claim 2 , wherein at least one of the cover elements can be moved with respect to the fuselage via an actuator.

4. The spacecraft afterbody device according to claim 1 , wherein at least one of the cover elements is continuously movable between the first position and the second position, to intermediate positions for correcting a trajectory of the vehicle.

5. The spacecraft afterbody device according to claim 1 , wherein at least one of the cover elements is movable between the first position and the second position, to intermediate positions for controlling the rocket engine.

6. The spacecraft afterbody device according to claim 1 , wherein at least one of the cover elements can be moved between the first position and the second position, to positions for thermally protecting the rear of the vehicle, wherein at least an internal wall of at least one of the cover elements has a high thermal resistance.

7. The spacecraft afterbody device according to claim 1 , wherein the cover elements comprise panels arranged so as to prolong the fuselage and extending beyond the rear of the vehicle's fuselage and arranged to be separately movable.

8. The spacecraft afterbody device according to claim 7 , wherein the cover elements comprise at least one generally upper panel and a generally lower panel capable of achieving control of the vehicle during stalls and dives.

9. The spacecraft afterbody device according to claim 7 , wherein the cover elements comprise at least two generally lateral panels capable of achieving control of the vehicle during a spin.

10. The spacecraft afterbody device according to claim 1 , wherein the cover elements comprise panels arranged as petals closing around the nozzle of the vehicle.

11. The spacecraft afterbody device according to claim 1 , wherein the cover elements comprise panels designed to form a screen that opposes a jet breakup of the rocket engine and to refocus a jet of the rocket engine to increase a thrust of the engine.

12. A spacecraft comprising a spacecraft afterbody device according to claim 1 , wherein the spacecraft is a space plane fitted with atmospheric engines for atmospheric flight phases of the plane.

13. A method for correcting a trajectory of a space plane having a device according to claim 1 , the method comprising:

moving at least one cover element of the device to intermediate positions between a position masking the a rocket engine nozzle of the plane and a fully deployed position; and

aerodynamically braking the plane.

14. A method for optimizing a rocket engine of a space plane having a device according to claim 1 comprising:

moving at least one cover element of the device to positions assisting a jet breakup of the rocket engine, between a position masking a nozzle of the rocket engine of the plane and a fully deployed position for aerodynamically braking the plane; and

correcting a trajectory of the plane by moving the at least one cover element to intermediate positions between the position masking the plane's rocket engine nozzle and the fully deployed position for aerodynamically braking the plane.