What are the actual benefits or advantages of using Hydraulic energy in aircraft systems, compared to pneumatic and electrical systems.

  • $\begingroup$ It's very compact. $\endgroup$ – user3528438 Oct 23 '17 at 15:27
  • $\begingroup$ This is a broad question, I'm sure whole books could be written on this subject. $\endgroup$ – RedGrittyBrick Oct 23 '17 at 15:35
  • $\begingroup$ Just imagine using an electric motor on an excavator. It's possible, but more complex. Hydraulic is powerful, we just need a small jack to move a huge mass. $\endgroup$ – mins Oct 23 '17 at 16:21
  • $\begingroup$ Hydraulics don't compress so more positive displacement. Hydraulics run at high pressure so smaller actuators can be used. Hydraulic leaks are visible. Pneumatic leaks aren't. $\endgroup$ – Transistor Oct 23 '17 at 19:34
  • $\begingroup$ A comparison with electric motors/actuators can be seen in this thread: Why do most commercial airplanes use hydraulics instead of electric/servo motors? $\endgroup$ – Neil Patrao May 15 at 10:12