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R. Spread angle is the additional gyro angle, over that required for hitting the same point of a moving target, set on the torpedo to make any type of spread. s. Advance is the perpendicular distance between torpedo final course and a line through the tube muzzle parallel and in the same direction as the torpedo final course. t. Intercept Point is the intersection of torpedo and target tracks. u. Large parallax exists when the advance of the torpedo is opposed to the general direction of the target's course.

Lie on the bottom if practicable. If located, run at high speeds when the enemy is coming in to attack, and stop and coast when he stops to listen. In the past, deliberate oil slicks and blowing of debris out of torpedo tubes or garbage ejectors has been an effective means of shaking off pursuit. k. If convoy or heavy ships are present, attempt to get close to them as escorting vessels probably will not drop depth charges near them. l. A persistent enemy may remain in vicinity 24 hours or longer; therefore, conserve the battery by balancing or bottoming, when practicable.

As soon as the pursuit has been shaken off, proceed as before and attempt to avoid further detection. i. Depending on the mission and other circumstances that the submarine commanding officer must evaluate, close pursuits may warrant the use of torpedoes against pursuing craft. j. For avoiding screens and patrols fitted with sound equipment other than echo-ranging, the submarine should make full use of its own listening gear for tracking purposes. Minimum speed, together with hand operation of all possible auxiliaries, is in order under these circumstances.

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Aircrew Manual - Fairey Swordfish MK II [AP 1517B-PN]

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