Installation manual
Howtoinstallthetransducer
Retractabletransducer
Hullunitsallowingthetransducertobeloweredandhoistedare
commonlyusedforhorizontallookingsonars.Whennotinuse,
thetransducerisretractedintoatrunk.
Theretractablehullunitismoreexpensivethanablister,buton
vesselswithahullwhereitisdifcultorimpossibletoinstalla
blister,itmaystillbeworthwhile.Theprinciplesofahullunit
witharetractabletransducerisshownbelow.
Vesselswithoutakeelandwithawide,atbottomisanexample
wherearetractablehullunitcanbetheonlyacceptablemethod
forbringingtheechosoundertransducerbelowtheboundary
layer.
(CD017012E)
B
E
C
D
A
ATransducer
BTrunk
CTransducer
shaft
DTransducer
shaftsleeve
EKeel
130003/D
21