Modular core structure for dual-manifest spacecraft launch

1. A dual-manifest spacecraft assembly, comprising:

an upper core structure and a lower core structure;

the upper core structure including an upper cylinder extending through a center of an upper spacecraft of a dual-manifest launch configuration;

the lower core structure including a lower cylinder extending through a center of a lower spacecraft with the upper cylinder mounted on top of the lower cylinder;

the upper cylinder having an upper cylinder inner diameter being substantially equivalent to a lower cylinder inner diameters;

at least one of the upper spacecraft and the lower spacecraft including a pair of payload equipment panels coupled to opposite sides of the respective upper and lower cylinder; and

the payload equipment panels being in general alignment with a longitudinal axis of the spacecraft.

2. The spacecraft assembly of claim 1 , wherein:

the lower cylinder is formed as a solid laminate of fiber-reinforced polymer matrix material.

3. The spacecraft assembly of claim 1 , wherein:

the upper cylinder is formed as a composite sandwich.

4. The spacecraft assembly of claim 1 , further comprising:

a first propellant tank housed within the upper cylinder and a second propellant tank housed within the lower cylinder.

5. The spacecraft assembly of claim 1 , wherein:

at least one of the upper cylinder and the lower cylinder is configured to be coupled to a common electronics module at common interface locations; and

at least one of the electronics module includes the pair of payload equipment panels.

6. The spacecraft assembly of claim 5 , wherein:

at least one of the upper cylinder and the lower cylinder has a reinforcing ring at the interface locations.

7. The spacecraft assembly of claim 5 , wherein:

the at least one of the upper spacecraft and the lower spacecraft including a pair of payload equipment panels comprises a pair of payload equipment panels for the upper spacecraft and a pair of payload equipment panels for the lower spacecraft;

the pair of payload equipment panels of the upper spacecraft being coupled to opposite sides of the upper cylinder;

the pair of payload equipment panels of the lower spacecraft being coupled to opposite sides of the lower cylinder; and

the pair of payload equipment panels of the upper spacecraft and the pair of payload equipment panels of the lower spacecraft being in general alignment with a longitudinal axis of the spacecraft.

8. The spacecraft assembly of claim 7 , wherein:

the upper spacecraft includes a pair of vertical shear panels and the lower spacecraft includes a pair of vertical shear panels;

the pair of vertical shear panels of the upper spacecraft extending radially outwardly from opposite sides of the upper cylinder for coupling the pair of payload equipment panels of the upper spacecraft to the upper cylinder; and

the pair of vertical shear panels of the lower spacecraft extending radially outwardly from opposite sides of the lower cylinder for coupling the pair of payload equipment panels of the lower spacecraft to the lower cylinder.

9. The spacecraft assembly of claim 7 , wherein at least one of the upper spacecraft and the lower spacecraft includes:

a top end panel and a bottom end panel mounted on opposite ends of the pair of the payload equipment panels of the respective upper spacecraft and the lower spacecraft.

10. The spacecraft assembly of claim 1 , wherein:

at least one of the upper spacecraft and the lower spacecraft is configured as a 3-axis-stabilized spacecraft.

11. A dual-manifest spacecraft assembly, comprising:

an upper core structure and a lower core structure;

the upper core structure including an upper cylinder extending through a center of an upper spacecraft of a dual-manifest launch configuration;

the lower core structure including a lower cylinder extending through a center of a lower spacecraft with the upper cylinder mounted on top of the lower cylinder;

the upper cylinder having an upper cylinder inner diameter being substantially equivalent to a lower cylinder inner diameter;

the upper cylinder being configured to be coupled to a common electronics module at common interface locations and the lower cylinder being configured to be coupled to a common electronics module at common interface locations;

the electronics module of the upper cylinder including a pair of payload equipment panels coupled to opposite sides of the upper cylinder;

the electronics module of the lower cylinder including a pair of payload equipment panels coupled to opposite sides of the lower cylinder; and

the pair of payload equipment panels of the upper spacecraft and the pair of payload equipment panels of the lower spacecraft being in general alignment with a longitudinal axis of the spacecraft.

12. A method of transporting a pair of spacecraft in a dual-manifest launch configuration, comprising the steps of:

supporting an upper spacecraft using an upper cylinder extending through a center of the upper spacecraft;

supporting a lower spacecraft using a lower cylinder extending through a center of the lower spacecraft with the upper cylinder mounted on top of the lower cylinder;

providing the upper cylinder in an upper cylinder inner diameter being substantially equivalent to a lower cylinder inner diameter;

providing at least one of the upper and lower spacecraft with a pair of payload equipment panels coupled to opposite sides of the respective upper and lower cylinder; and

the payload equipment panels being in general alignment with a longitudinal axis of the spacecraft.

13. The method of claim 12 , further comprising:

providing the lower cylinder as a solid laminate of fiber-reinforced polymer matrix material.

14. The method of claim 12 , further comprising:

providing the upper cylinder as a composite sandwich.

15. The method of claim 12 , further comprising:

including a first propellant tank within the upper cylinder and a second propellant tank within the lower cylinder.

16. The method of claim 12 , further comprising:

providing at least one of the upper spacecraft and the lower spacecraft with a common electronics module coupled to respective ones of the upper cylinder and the lower cylinder at common interface locations; and

the electronics module of the at least one of the upper and the lower spacecraft including the pair of payload equipment panels.

17. The method of claim 16 , wherein:

the electronics module is coupled to a reinforcing ring at the interface locations of the at least one of the upper cylinder and the lower cylinder.

18. The method of claim 16 , wherein the step of providing at least one of the upper spacecraft and the lower spacecraft with a common electronics module includes:

providing the upper spacecraft with a pair of payload equipment panels coupled to the upper cylinder and providing the lower spacecraft with a pair of payload equipment panels coupled to the lower cylinder;

the pair of payload equipment panels of the upper spacecraft being positioned on opposite sides of the upper cylinder;

the pair of payload equipment panels of the lower spacecraft being positioned on opposite sides of the lower cylinder; and

the pair of payload equipment panels of the upper spacecraft and the pair of payload equipment panels of the lower spacecraft being in general alignment with a longitudinal axis of the spacecraft.

19. The method of claim 18 , further including:

providing the upper spacecraft with a pair of vertical shear panels and providing the lower spacecraft with a pair of vertical shear panels;

the pair of vertical shear panels of the upper spacecraft extending radially outwardly from opposite sides of the upper cylinder;

the pair of vertical shear panels of the lower spacecraft extending radially outwardly from opposite sides of the lower cylinder;

the pair of payload equipment panels of the upper spacecraft being coupled to the vertical shear panels of the upper spacecraft; and

the pair of payload equipment panels of the lower spacecraft being coupled to the vertical shear panels of the lower spacecraft.

20. The method of claim 18 , further including:

providing at least one of the upper spacecraft and the lower spacecraft with a top end panel and a bottom end panel mounted on opposite ends of the pair of payload equipment panels of the at least one of the upper spacecraft and the lower spacecraft.