Figure 6-2.- Ejection seat assembly.

rocket around the pitch axis, which changes the thrust/cg relationship and applies a correcting moment.

YAW THRUSTER.- To achieve safe separation of multicrew seat trajectories, a yaw thruster is used on each seat to provide a controlled, lateral-angle dispersion from the aircraft's direction of flight. Two types of yaw thrusters are used on the forward and aft seats, with location always on the inboard side of each seat. A low yaw thruster, producing approximately a 10.4 pound-second impulse for 0.1 second, is installed on each forward seat, and a high yaw thruster, producing approximately a 21.0 pound-second impulse for 0.1 second, is installed on each aft seat. The yaw thruster is ignited by high-pressure gas ported from the top of the rocket catapult. To provide proper yaw rotational impulse for each seat installation, the yaw thruster is mounted to provide a predetermined moment arm about the center of gravity of the seat/crew member system. The mounting bracket for each thruster incorporates a boss that, when combined with a fixed stop permanently mounted on each guide rail, will prevent incorrect installation. The right and left seats are yawed to produce changes in the trajectory paths. Each of the four crew member seats will be separated from the others at parachute full-open condition under nominal lateral center-of-gravity conditions.

YAW VANE.- To assist in providing the proper yaw rotation at higher airspeeds, an aerodynamic yaw vane is installed on the out-board, lower aft side of each seat. The yaw vane deploys just as the seat leaves the guide rails and presents a drag area of 1/2 square foot to yaw the seat approximately 20 degrees. At this position, the vane is blanked by the man/seat structure, and becomes ineffective in creating any further increase in the degree of rotation.