Asdic
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Introduction At the beginning of the war, the Dutch Navy had limited capabilities against submarines. The more modern ships (such as the Van Kinsbergen had a German device similar to the British "Asdic" and American "Sonar". These used sound waves to detect submerged submarines. The older ships had more rudimentary equipment, such as hydrophones. During the war, many ships were upgraded using British and American equipment.For a general description of how Asdic works, please follow this link. |
Type 123 Standard asdic type for the Flower-class corvettes. Very rudimentary, but reliable. Her biggest shortcoming was the fact that she couldn't pinpoint the submarine's depth. The dome was fixed, because the asdic could take a maximum speed of 18 knots, while the corvette could only do about 16. |
| Specs | |
| Classes used on | Flower-class corvettes N-class destroyers |
| Ships | Hr.Ms. Friso Van Galen (type 123-A) Tjerk Hiddes (type 123-A) |
| Year | 1934 |
| Band | 14 to 22 Kilocycles |
| Range | |
| Gyro | Magnetic |
| Dome specs | |
| Type | Fixed |
Type 124 This was an updated version of the Type 121. First introduced in the Royal Navy 1936-1937. |
| Asdic specs | |
| Classes used on | Town-class escorts |
| Ships | Hr.Ms. Campbeltown |
| Year | 1941 |
| Band | |
| Range | |
| Dome specs | |
| Type | Retractable |
Type 128 |
| Asdic specs | |
| Classes used on | River class frigates R.N.N. ships refitted during the war. |
| Ships | Hr.Ms. Johan Maurits van Nassau Van Kinsbergen (type 128-C) |
| Year | 1943 |
| Band | |
| Range | |
| Dome specs | |
| Type | Retractable |
Type 140-A First introduced 1937. |
| Asdic specs | |
| Classes used on | Gruno-class gunboats (refitted in the United Kingdom) |
| Ships | Gruno |
| Year | 1941 |
| Band | |
| Range | |
| Dome specs | |
| Type | Retractable |
| May 31, 2006 | Revised page |
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