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LONGITUDINAL CONTROL SYSTEM CHARACTERISTICS (“FEEL”)
The pilot commands longitudinal vehicle response mainly through control column inputs. Hence it is found that the characteristics of the control system
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Fig. 12.15 Effect of stick force and stick movement per g on pilot opinion (from ref. 12.15). |
influence the handling qualities of the vehicle. An otherwise satisfactory – vehicle can he rated as poor due to a control system that does not “feel” right to the pilot. Figure 12.15 shows the manner in which pilot rating varied with stick movement per g and stick force per g in an aircraft with an irreversible control system. It is seen that there is only a relatively small region where a satisfactory rating is achieved, indicating the importance of the proper selection of control system characteristics. The studies which produced these results also determined that pilots do not object to break-out or frictional forces if they are not large when compared to the stick force per g.
