Furuno BBDS1, Operator'S Manual

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1. MOUNTING
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1.2.3 Installation Procedure
1. With the boat hauled out of the water, mark the location selected for mounting the transducer
on the bottom of the hull. If the hull is not level within 15 degrees in any direction, fairing blocks
made out of teak should be used between the transducer and hull, both inside and outside, to
keep the transducer face parallel with the water line. Fabricate the fairing block as shown be-
low and make the entire surface as smooth as possible to provide an undisturbed flow of water
around the transducer.
The fairing block should be smaller than the transducer itself to provide a channel to divert
turbulent water around the sides of the transducer rather than over its face.
2. Drill a hole just large enough to pass the threaded stuffing tube of the transducer through the
hull, making sure it is drilled vertically.
3. Apply a sufficient amount of high quality caulking compound to the top surface of the trans-
ducer, around the threads of the stuffing tube and inside the mounting hole (and fairing blocks
if used) to ensure watertight mounting.
4. Mount the transducer and fairing blocks and tighten the locking nuts. Be sure that the trans-
ducer is properly oriented and its working face is parallel to the water line.
Note: Do not over-stress the stuffing tube and locking nuts through excessive tightening, since
the wood block will swell when the boat is placed in the water. It is suggested that the nut be tight-
ened lightly at installation and retightened several days after the boat has been launched.
Saw along slope of hull
Hole for stuffing tube
Upper half
Lower half
BOW
Flat washer
Rubber
washer
Deep-V Hull
Hull bottom
Fairing block
Flat Hull
Hull bottom