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RULE: Attacks at night in smooth water from awash or surface condition have proven effective. Clear twilight offers very favorable light conditions for shots from the submerged condition. REASON: With a favorable background (with reference to clouds and moon) a submarine can approach on the surface to within 500 yards without being sighted. Under these conditions a ship would probably be visible 1,000 to 1,500 yards. In twilight attacks a submarine will endeavor to attack on the side away from the bright background.
METHOD TO AVOID ATTACK: Keep the wind and sea abaft the beam if possible. 85. -RULE: A submarine will seldom fire a torpedo when the sea is dead calm. REASON: In a calm sea a periscope will generally be sighted before the submarine reaches firing range, and if the torpedo is fired it can be seen sufficiently early to be avoided in most cases. htm (33 of 35)7/19/2006 21:38:17 Analysis of the Advantage of Speed and Changes of Course in Avoiding Attack by Submarine - ONI Pub. No. 30 RULE: Force of wind 3-4 and a whitecap sea present the most favorable conditions for submarine attack.
30 RULE: Force of wind 3-4 and a whitecap sea present the most favorable conditions for submarine attack. REASON: (a) The sea just washes over the periscope if the latter is shown sparingly, and, without masking the view from the periscope, makes it difficult for the ship to recognize the periscope. (b) At any considerable distance the periscope feather can not be distinguished from the small breaking seas. (c) The submarine is easily kept at the proper depth for the attack. (d) The torpedo is not apt to broach.