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HACS
High Angle Control System (HACS) was a British anti-aircraft fire-control system employed by the Royal Navy from 1931 onwards and used widely during World War II. HACS calculated the necessary deflection required to place an explosive shell in the location of a target flying at a known height, bearing and speed.
==Early history==
The HACS was first proposed in the 1920s and began to appear on RN ships in January 1930, when HACS I went to sea in HMS Valiant.〔Weapon Control in the Royal Navy 1935-45, Pout, from The Application of Radar and other Electronic Systems in the Royal Navy in WW2, p87 (Kingsley-editor)〕 HACS I did not have any stabilization or power assist for director training. HACS III which appeared in 1935,〔Appendix one, Classification of Director Instruments, see external links.〕 had provision for stabilization, was hydraulically driven, featured much improved data transmission and it introduced the HACS III Table.〔Weapon Control in the Royal Navy 1935-45, Pout, from The Application of Radar and other Electronic Systems in the Royal Navy in WW2, p87,99 (Kingsley-editor)〕 The HACS III table (computer) had numerous improvements including raising maximum target speed to 350 knots, continuous automatic fuze prediction, improved geometry in the deflection Screen, and provisions for gyro inputs to provide stabilization of data received from the director.〔HACS III Operating Manual Part 1, paragraph 2 (a-o)〕 The HACS was a ''control system'' and was made possible by an effective data transmission network between an external gun director, a below decks fire control computer, and the ship's medium calibre AA guns.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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