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Escape
Published in David G. Newman, Flying Fast Jets, 2014
Ejection seats are designed to egress the aircrew from the aircraft without exceeding the inherent G limits of the body. In general, the human body will cope with G onset rates up to 300G/sec, and with peak G not exceeding +25Gz. As such, a pilot’s chance of surviving an ejection is greatly reduced should these limits be exceeded, and their chance of injury is similarly increased. In general, modern ejection seats produce a +Gz profile in the range of +14 to +16 Gz at an onset rate in the range of 180 to 210 +Gz/second.
Science And Technology of Aircraft Seat Ejection: Advanced Concepts
Published in Cogent Engineering, 2022
An ejection seat is an explosive powered life-saving device to provide the safe and reliable means for the pilot to abandon the aircraft in the shortest possible time to save himself when the aircraft is in danger (B. Zygmunt et al., 2008). The ejection seat comprises a telescopic gun, harness system, parachute deployment system, rocket pack, survival pack, etc. The energy required to work against the gravity in the upward direction is provided by the propellant content in them. This energy is supplied to the entire system in installment. The ejection seat is mounted on a rail track fitted to the aircraft structure. It is one of the means of escape throughout the flight envelope while flying. For most of the fighter aircraft including trainer aircraft, it is challenging to imagine an aircraft without ejection seats. Therefore, it is essential to provide an ejection seat inside cockpit of aircraft in the adverse condition during either combat or testing so as to eject the pilot (Sławomir STępień, et.al 2017). Ejection seats are composed of many intricate systems and subsystems mounted on the ejection rail. Engineers, scientists, and researchers have made tremendous contributions in science and technology pertaining to seat ejection technology. Significant contributions and research have been made in these critical areas. The system has been designed that it never fails to work. Acceleration, rate of rise of acceleration, and forces experienced by the pilots are well within acceptable physiological limits as laid down by Institute of Aerospace Medicine (IAM), Bengaluru (Parate et al., 2001). Using an anthropomorphic dummy, this has been demonstrated by carrying out the number of tests. The advanced concept of seat ejection considered various factors such as aerodynamic forces, wind blast, neck forces, and stability of seat and occupant. The recent trend of seat ejection seat has undergone revolution significantly after its introduction in fighter aircraft after World War (WW) II due to tremendous progress in science and technology.