|Object Name:||Pilot's Stick Sensor Assembly|
|Year of Manufacture:||Unknown|
|Location:||Main Object Store|
GEC Avionics Limited
Pilots Stick Sensor Assy
Modification Record 1, 2, 3, 4
The UK Experimental Aircraft Programme EAP aircraft had a central pilot stick. The amplitudes of the pilot stick correspond to the electrically generated quantity of control signals. Via a complex spring/damper system, the stick is reset to its neutral position without noteworthy overshoots.
The stick is a two-axis one and provides pitch and roll electrical command signals. Typically, four independent electrical pick-offs are provided for each axis of control in order to meet the failure survival requirements. The damper provides a smooth feel to the stick movement: the spring and damper combination acting as a low pass filter on the stick movement. A small breakout force is required to displace the stick from the central position in pitch and roll. Roll control is a simple linear spring characteristic, Pitch, however requires a step increase in force at larger stick deflections and the spring rate is also increased so that larger forces have to be exerted when commanding high g manoeuvres.
This concept was taken further into the Typhoon with the Stick Sensor and Interface Control Assembly (SSICA).