3 ms·
Airliner control surfaces are 100% hydraulically actuated. It isn't a matter of actuation force, it's a matter of aerodynamics.
by anamexis 8y ago
Airliner control surfaces are 100% hydraulically actuated. It isn't a matter of actuation force, it's a matter of aerodynamics.
- bronco21016 8y agoNot always. See the MD88.
- clon 8y agoThe 737 stabilizer trim is actuated by steel cables running from the nose of the aircraft to the tail, guided by pulleys [1]. The same cables also make the wheels spin when the stab trim motors are running. [1] http://aerossurance.com/wp-content/uploads/2015/03/737-controls.png http://aerossurance.com/wp-content/uploads/2015/03/737-contr...
- anamexis 8y agoWild. Thanks for the correction.
- userbinator 8y agoThe comment I'm replying to says Elevator upwards deflection loads the tailplane aerodynamically in such a way that it becomes harder to trim the tailplane in the required direction. so I'm not sure what you mean by "matter of aerodynamics", because that comment suggests that it only gets harder due to the forces exerted by the air on the control surfaces, and so could be overcome by applying more force --- which a hydraulic system could be engineered to do.