1. A control system for a dynamic flight simulator comprising, in combination: simulator control means operable by a human subject in the simulator for generating flight command signals corresponding to those in a simulated aircraft; first computer means for translating said command signals to simulated aircraft motion signals indicative of the commanded linear acceleration and angular motion of the simulated aircraft; function generator means responsive to the longitudinal acceleration component of the simulated aircraft linear acceleration motion signals for generating a variable bias signal which maintains the actual longitudinal acceleration of the simulator above a preselected level; second computer means responsive to the motion signals of the simulated aircraft and said bias signal for generating a control signal for driving the simulator in response thereto; sensor means for generating a simulator signal indicative of the linear acceleration and angular motion actually encountered by the simulator; third computer means responsive to said motion signals of the simulated aircraft for generating signals indicative of the perceived roll and pitch angular motions predicted for a pilot in the simulated aircraft; fourth computer means responsive to the simulator signal for generating signals indicative of the perceived roll and pitch angular motions predicted for the subject in the simulator; first comparator means responsive to the perceived simulator and simulated aircraft roll signals for producing an output signal indicative of the difference therebetween; and second comparator means responsive to the perceived simulator and aircraft pitch signals for producing an output signal indicative of the difference therebetween.