How many fully redundant hydraulic systems does the B-707 have?
Note: There is NO hydraulic power assist to the inboard/outboard ailerons or elevators.
These are assisted by a special type of servo tab, called....balance panels.
The rudder also has balance panels for control assist in the event that auxilary hydraulic power is unavailable, however Vmca is greatly increased.
|Quoting Blackbird (Reply 6):|
Technically when the B-707 was first built, even the rudder had no hydraulic boost either! From what I remember Boeing wanted to keep the design as simple as possible to make transition from prop to jet as simple as possible. Turned out though that the rudder wasn't particularly as effective as desired when dealing with an outboard engine failure during the takeoff run, plus the British demanded all sorts of requirements of the B-707 for it to be certified in the UK, which included a powered rudder with Q-feel, and a ventral-fin for improved directional stability.
(Out of curiosity, did the KC-135 have a hydraulically powered rudder from the get-go? -- If so, did it have artificial-feel?)
I thought the B-707 had both balance panels and control-tabs.