Interphase Outlook Operation Manual page 14

MOLDED FAIRING BLOCK
If your installation requires a fairing block, you
may either have one made locally, or purchase
a molded plactic unit from Interphase or your
Interphase distributor.
For this transducer, the molded Fairing Block
Part Number is:
42-2004-000
Mount Transducer so it is Vertical
Waterlin
Hull
Transducer
Waterlin
Hull
Keep parallel
to waterline !
Forward
Hex Nut
Keep parallel
to waterline !
14
d. Mount the transducer on the side of the hull where the
propeller is moving downwards. The upward motion of
the propeller generates pressure waves and
pushes bubbles up against the hull.
DO NOT install a bronze transducer housing directly into
an aluminum or steel hull because electrolytic corrosion
will occur. Consult your boat-yard for information on
stainless or plastic sleeves.
IMPORTANT:
1) Make sure the water flow across the thru-hull
transducer is bubble and turbulence free at all speeds if
good performance is to be achieved.
2) Make sure the transducer has an unobstructed view of
the water ahead and below the boat.
3) On displacement-hull power boats, the transducer
should be mounted relatively close to the center line of
the hull.
4) Mount the transducer in a place which has reasonable
access from inside the vessel since the transducer's
bronze nut will require tightening from inside the hull.
Because the Outlook scans a 12 degree beam from the
surface ahead to directly below the boat, it is important to
make sure that the transducer is installed so that it will
scan in a vertical direction and not off to either side. The
transducer must be mounted so that it's bronze stem is as
perpendicular to the water line as possible. If necessary,
use a fairing block to properly position the transducer.
Use of a Thru-hull Fairing Bl
Nearly all vessels have some dead rise angle at the
transducer mounting location. If the thru-hull transducer
were mounted directly to the hull, the sound beam would
be tilted off the vertical at the same angle as the dead-rise.
Most thru-hull installations will require a fairing block to
insure the transducer is mounted properly.
A fairing block is typically made of teak or mahogany
wood or plastic and should be glued between the
transducer and hull (both inside and outside) to insure that
the transducer's mounting shaft is perpendicular to the
water's surface. Make the fairing block as smooth as
possible, and not bigger than the transducer's face, to
minimize possible turbulence (see below).
After cutting the fairing block, trial fit the block to the
hull. It is very important that the flat top surface of the
transducer be parallel to the water. Because of the skill
required, we suggest that your professional boatyard
provide the fairing block.
ock