Installation manual
SimradES38-12
Retractabletransducer
Hullunitsallowingthetransducertobeloweredandhoistedarecommonlyusedfor
horizontallookingsonars.Whennotinuse,thetransducerisretractedintoatrunk.
Figure14Retractable
transducer
ATransducer
BTrunk
CTransducershaft
DTransducershaftsleeve
EKeel
Theretractablehullunitismoreexpensivethan
ablister,butonvesselswithahullwhereitis
difcultorimpossibletoinstallablister,itmay
stillbeworthwhile.Theprinciplesofahullunit
witharetractabletransducerisshownbelow.
Vesselswithoutakeelandwithawide,atbottom
isanexamplewherearetractablehullunitcanbe
theonlyacceptablemethodforbringingtheecho
soundertransducerbelowtheboundarylayer.
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