3.2.3-12 Force Joysticks Dynamic Characteristics

The output of the force joystick should be proportional to and in the same direction as the user's perceived applied force. Maximum force for full output should not exceed 27 lb (118 N).

Additional Information:
Movement should be smooth in all directions, and positioning of a follower should be attainable without noticeable backlash, cross-coupling, or need for multiple corrective movements. Control ratios, friction, and inertia should meet the dual requirements of rapid gross positioning and precise fine position. When used for generation of free-drawn graphics, the refresher rate for the follower on the display should be sufficiently high to give the appearance of a continuous track.