The Effect of Submarine Maximum Speed on the Hit Probability of an Air-Launched Torpedo
ADMIRALTY UNDERWATER WEAPONS ESTABLISHMENT PORTLAND (UNITED KINGDOM)
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This report provides a method of evaluating the effect of an increase in maximum submarine speed on the hit probability of an air-dropped torpedo. Curves are given from which it is possible to determine torpedo hit probability as a function of target speed for various weapon systems, torpedo characteristics, and target characteristics. The theory is applied to typical systems involving the air-launched torpedo, and the parameter values are selected to show what could be achieved within the timescale of a future generation submarine. The significance of a worthwhile decrease in torpedo hit probability with an increase in submarine maximum speed depends critically on the choice of weapon parameters. In the case of a torpedo with the characteristics of the NASR 7511, increased submarine maximum speed up to 40 knots is only valuable if it is being exploited at the commencement of the torpedo attack. In the case of a weapon with a speed of only 35 knots, an active acquisition range of 1200 metres and the same endurance as the NASR 7511, there appears to be a considerable gain for the submarine if its maximum speed is increased to 35 knots. Submarine reaction time, up to 30 seconds, does not appreciably affect the torpedo hit probability for weapon acquisition delay times of 30 seconds.
- Undersea and Antisubmarine Warfare