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Due to the low gravity a highly reliable fixation of the ROSETTA Lander to the target is essential.
The lander will be equipped with two identical anchoring harpoons, attached to
the central part of the landing gear.
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Model of the Rosetta Lander
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Anchor electronics
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Qualification model of a anchoring harpoon
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Each harpoon consists of four main components:
- The projectile (anchor), which is designed to anchor safely in a wide range
of different comet materials. An accelerator and a temperature sensor
are mounted inside the anchor as part of the MUPUS experiment.
- The expansion cylinder: Immediately after touchdown the projectile is
accelerated and shot out from the cylinder by a cartridge driven piston.
- The cable magazines,mounted beside the cylinder. The anchor cable
including the sensor wires.
- The rewind system consists of a gearmotor driven coil with an angular
encoder and a releasable freewheeling brake.
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Volume Model of the Anchor harpoon
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The main performance parameters of the Anchoring System
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| max gas pressure |
250 bar |
| anchor velocity at release |
60 m/s |
| rewind velocity |
0.5 m/s |
| penetration depth |
10 cm... 2.5 m |
tightening force
(commandable) |
6 ... 36 N |
| break force of the cable |
100 N |
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