Ballistics of Main Seat Ejection Cartridges for Aircraft Application
This article outlines the ballistics of main seat ejection cartridges for aircraft application. The ballistics of main seat ejection cartridges plays a vital role during the ejection of the pilot in an emergency. The ballistic parameters such as maximum pressure, time to reach the maximum pressure, and time required to reach half the maximum pressure that responsible to the spinal injury of the pilot are assessed. Therefore, the evaluations of these parameters are very critical during various stages of development. Elaborate testing is carried out for main seat ejection cartridges on seat ejection tower (SET) at different operating temperatures considering physiological limits. As these trials are cumbersome in nature, a vented vessel (VV) testing facility is devised to lay down the performance parameters at hot and cold temperature conditions. Single base (SB) propellant having hepta-tubular configuration is selected as the main filling. Gun powder plays the role of a booster based on ballistic requirements. The evaluation methodology of various performance parameters of main seat ejection cartridges is explained in this paper. Physiological parameters such as maximum seat ejection velocity, acceleration, and rate of rising of acceleration are also experimentally determined on SET. All the parameters are observed well within physiological limits. This paper addresses the internal ballistic of main seat ejection cartridges, propellant selection, its calculation, and evaluation of various performance parameters for aircraft application.
Keywords: Ballistics of seat ejection, ejection seat, gas generator, gun propulsion, main seat ejection cartridges, maximum pressure, performance parameters, propellant, progressive burning and vented vessel.Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 409
 B A Parate and P K S Nair: Design of Main Ejection Seat Cartridges, Proceedings of One day National Workshop on Power Cartridges, pp 97 -102 (2000).
 A K Sahu, B A Parate, Virendra Kumar and D K Kharat: Aircraft Ejection Seats – Advanced Concepts. Sixth National seminar and exhibition on Aerospace and Related Mechanisms (ARMS), pp 223-228 (2008).
 B A Parate, A K Sahu and Virendra Kumar: Design, Development, Testing and Performance Evaluation of Main Ejection Seat Cartridges for fighter Aircraft - International High Energy Materials Conference & Exhibit (2009).
 B A Parate, A K Sahu, Virendra Kumar and D K Kharat: Development approach of Power Cartridges for fighter aircraft, Proceedings of 6th National Seminar on Aerospace and Related Mechanisms (2008).
 Engineering Design Handbook - Propellant Actuated Devices, Army Material Command Publication, Alexandria, Virginia, USA (1975).
 S J Hooper and D R Ellis Aviation safety and crashworthy seat design, International Journal of Crashworthiness, Vol 2 No I, pp 39-54 (1997), DOI: 10.1533/cras.1997.0034.
 Rocketry with solid propellants - Himanshu Shekhar, Studium Press (I) Pvt. Ltd, New Delhi. ISBN :978-93-85046-15-5 (2018).
 Specification to govern, manufacturing, inspection and supply of NHO96 propellant for use in main seat ejection cartridge, HEMRL specification No. ERDL/GP/217.
 B A Parate, A V Namboodiri and P U Deshpande: Design of Test Vessel / Test Equipments for Performance Evaluation of various Power Cartridges: Proceeding of National Workshop on Power Cartridges, pp 161 - 171 (2001).
 B A Parate, R Vijayppan and C M Kulkarni: Testing and Evaluation of Escape-aid system’s Cartridges for use in military aircraft: Proceeding of National Workshop on National Seminar on Military Airworthiness Certification (NaSMAC) , pp 45 - 55 (2004).
 B A Parate, Sunil Chandel and Himanshu Shekhar: Experimental analysis of Ballistic parameter evaluation of power cartridge in vented vessel for water-jet application, Science & Technology of Energetic Material, Vol. 81(2), pp 47-52 (2020).