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The mechanisms can be used for one-time operation during the first 10 hours after SC separation from the launch vehicle (LV),
for formation of the necessary ellipsoid of SC inertia.
The gravity boom consists of an end load, a boom and a drive-out mechanism.
The drive-out mechanism is an electromechanical (in mechanisms A and B) or a spring (in mechanism C) drive for rotation of a drum with a
steel elastic tape wound on the drum. The tape is converted into a pipe with a thin wall in the process of its driving-out. The drive-out
mechanism includes the units for locking the end load, the units for adjustment of the accuracy of driving-out the boom, a guiding unit of
the boom, a clutch for disconnection of a kinematic circuit, a potentiometric drive-out sensor and a contact sensor that operates at
complete drive-out of the boom. The basic parts of the drive-out mechanism, the boom and the end load are not magnetic. |
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Drive-out mechanism | A | B | C |
| Mass of load driven-out, kg | 25 | 3 | 12 |
| Distance from the mating plane of the gravity boom to the center of mass of the load driven-out, mm |
17000 | 5000 | 6000 |
| Deviation of the center of mass of the driven-out load from the normal to the mating plane, not more than, mm |
400 | 100 | 130 |
| Time of driving-out the boom, s | 600 | 250 | 60 |
| Type of the drive | Electromechanical | Spring |
| Supply voltage, V | 28 | 28 | |
| Consumption current, A | 0,64 | 0,20 | |
| Total mass of the mechanism, kg | 37 | 4,5 | 20,2 |
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