Asdic types used in the Royal Netherlands Navy

Standard asdic type for the Flower-class corvettes. Very rudimentary, but reliable. ... Type 124. This was an updated version of the Type 121. Asdic Introduction Atthebeginningofthewar,theDutchNavyhadlimitedcapabilitiesagainstsubmarines.Themoremodernships(suchastheVanKinsbergenhadaGermandevicesimilartotheBritish"Asdic"andAmerican"Sonar".Theseusedsoundwavestodetectsubmergedsubmarines.Theoldershipshadmorerudimentaryequipment,suchashydrophones.Duringthewar,manyshipswereupgradedusingBritishandAmericanequipment. ForageneraldescriptionofhowAsdicworks,pleasefollowthislink. Type123 StandardasdictypefortheFlower-classcorvettes.Veryrudimentary,butreliable.Herbiggestshortcomingwasthefactthatshecouldn'tpinpointthesubmarine'sdepth.Thedomewasfixed,becausetheasdiccouldtakeamaximumspeedof18knots,whilethecorvettecouldonlydoabout16. Specs Classesusedon Flower-classcorvettesN-classdestroyers Ships Hr.Ms.FrisoVanGalen(type123-A)TjerkHiddes(type123-A) Year 1934 Band 14to22Kilocycles Range   Gyro Magnetic Domespecs Type Fixed   Type124 ThiswasanupdatedversionoftheType121.FirstintroducedintheRoyalNavy1936-1937. Asdicspecs Classesusedon Town-classescorts Ships Hr.Ms.Campbeltown Year 1941 Band   Range   Domespecs Type Retractable   Type128 Asdicspecs Classesusedon RiverclassfrigatesR.N.N.shipsrefittedduringthewar. Ships Hr.Ms.JohanMauritsvanNassauVanKinsbergen(type128-C) Year 1943 Band   Range   Domespecs Type Retractable   Type140-A Firstintroduced1937. Asdicspecs Classesusedon Gruno-classgunboats(refittedintheUnitedKingdom) Ships Gruno Year 1941 Band   Range   Domespecs Type Retractable May31,2006 Revisedpage Back Home