The Pacific War Online Encyclopedia
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This sonar was installed on American destroyers beginning in 1934. By
September 1939 it had equipped sixty destroyers and additional sets
were being produced at the rate of 14 per year. Some 170 destroyers
were equipped with sets by the time war broke out in the Pacific. It
remained the standard destroyer sonar until 1944, when QGA began to be fitted to new
destroyers. By then it was proving ineffective against higih-speed submarines and vulnerable to sonar countermeasures.
QC sent out a beam that
was 14 degrees wide in the horizontal direction and so wide in the
vertical direction that it gave no depth information. It operated at 24
kHz with a power of up to 300 watts, yielding a maximum range of 3,635 yards (3324m) under perfect
conditions on a destroyer steaming at five knots. Range fell off
sharply at speeds above ten knots and under realistic sea conditions.
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