Raytheon HSB L755, Owner'S Handbook Manual

Page: 39 / 224

Chapter 2: Installation 2-9
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Figure 2-6: Best Location for Thru-hull Transducer
• Fin keel sailboats – Mount to the side of the centerline and forward of the
fin keel 1 - 2 ft (300-600 mm).
• Full keel sailboats – Locate amidships and away from the keel at the point
of minimum deadrise angle.
• Fiberglass Hulls – Since the hull absorbs acoustic energy, transmitting
through the hull reduces the sensors performance. Fiberglass hulls are
often reinforced in places for added strength. These cored areas contain
balsa wood or structural foam which are poor sound conductors. If you
cannot avoid locating the sensor over coring, follow the instructions for
Installation in a Cored Fiberglass Hull on page 2-26.
• Headroom– Allow adequate headroom inside the vessel for the height of
the thru-hull housing, tightening the nuts and removing the insert. The
minimum headrooms for the B44-TH are:
With fairing: 10" (254 mm)
Without fairing: 12" (305 mm)
1/3 Aft
Load waterline length (LWL)
Pressure waves
6 -- 12 in
(150 -- 300 mm)
Displacement hull
Planning hulls
Outboard and I/O
Inboard
Step hull Fin keel sailboat
Full keel sailboat
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