Timeline for Do Falcon 9 grid fins lock up during reentry?
Current License: CC BY-SA 4.0
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| Apr 20, 2021 at 22:58 | comment | added | user39728 | Well yes, they use hydraulic actuators to extend, but is there an actual locking mechanism to keep them extended, or do they rely on the sum of the hydraulic actuation force and the aerodynamic force to keep them extended? Using a hydraulic actuator to push the grid fin against a hard stop is not by itself a locking mechanism, as you could still force the grid fin down if you can overcome the hydraulic actuator and aerodynamic forces. A locking mechanism is one that would keep the fin extended even if you removed the hydraulic and aerodynamic forces and tried to force the fin to retract. | |
| Apr 20, 2021 at 11:35 | history | answered | BrendanLuke15 | CC BY-SA 4.0 |