just my personal reminder note: its an error to think that dual hydraulic have twice the actuator thrust power, two piston on the same shaft (with pressure equaly regulated for the two pistons), does not double the thrust.
only higher hydraulic pressure can do that and actually the dual hydraulic version has a slightly inferior hydraulic pressure.
single hydraulic: 40 bars
dual hydraulic: 35 bars
Please explain. Force equals pressure x area. So if you have two pistons of the same surface area being acted on by the same pressure, you’ll have twice the force. It’s a simple way to keep the set is light and compact compared to having one large servo (plus redundancy). If you lose a hydraulic system there are normally RFM limits on speed and angles of bank - because you have less servo power.