SOME BODY DISPLACEMENTS AND MEDICAL EFFECTS OF LATERAL ACCELERATIONS DURING NAVY CENTRIFUGE SIMULATION OF EJECTION CAPABILITIES FROM THE ARMY AO AIRCRAFT
NAVAL AIR DEVELOPMENT CENTER WARMINSTER PA AVIATION MEDICAL ACCELERATION LAB
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For steadily applied lateral loads in the MartinBaker Mark J5 Ejection Seat and restraint system in use in the YAO-1 aircraft, lateral displacement of the pilot is such as to make questionable safe ejection at 2 G past the canopy beam located 12.5 in from the seat center, even with the restraint harness tighter than would be the case in general flying. With additional equipment on the pilot inside of the restraint harness, lateral displacements will probably be increased. For steadily applied lateral loads above 2 G, this study indicates that lateral displacements of the pilot would preclude safe ejection. The theoretical discussion in the previous section indicates that either body motion damping effects, reducing displacements, or resonance overshoot effects, increasing displacements might occur for the shorter duration acceleration pulses of aircraft in-flight accidents. Unit such time as the resonance frequencies and damping of this manseat-restraint system can be determined, the shoulder displacement values of this study are reasonable predictions of displacements to be expected in aircraft experiencing similar acceleration components.