Warship 2017 by John Jordan and Stephen Dent

Author:John Jordan and Stephen Dent
Language: eng
Format: azw3
ISBN: 9781844864737
Publisher: Bloomsbury Publishing
Published: 2017-05-17T16:00:00+00:00

Fig 5: Perspective views of HACS (left) and FKC (right) installations.

Fig 6: HACS 4 Director. HACS 1-4 had a rangefinder fitted at the forward edge of the director, while in the Mk 5 and Mk 6 the rangefinder was fitted at the rear; in the later Mk 6 it disappeared altogether.

Range Present (Rp): measured by optical (coincidence) rangefinder (or later by radar Type 285).

Target Height (H): calculated from the optical rangefinder (Rp) and angle of sight (Sp). Once measured, height was set onto the table and left alone.

Target Speed (u): visually estimated by the Control Officer, and could be adjusted to bring bursts into line with target.

Angle of Presentation (AoP): the ‘clock orientation’ of the target’s path relative to the ship (XII going directly away, VI directly towards). It was measured visually by the director officer using a graticule in his optical sight aligned with the target’s fuselage.

Range Future (Rf): predicted forward to a point where the target and shell burst intersect. Predicted target travel P > F included shell time of flight (Tf), using Average Projectile Velocity (APV), plus a fixed ‘dead time’ from the shell fuse being set before it was fired. Tf was set as Fuse Number (Fn), which was the time from the point of firing to the burst.

(Note that APV was not quite the same as Muzzle Velocity [MV] since the shell slowed down during later flight.)

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