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. HACS I did not have any stabilization or power assist for director training. HACS III which appeared 1937, had provision for stabilization, was hydraulically driven, featured much improved data transmission and it introduced the HACS III Table. 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. 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.
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