NorthStar Navigation 491 installation manual Using anti-fouling paint, Lwl

SECTION TWO — Installing the transducer

3˚ incline angle

1/3 aft

LWL

(Load Waterline Length)

FIGURE 2: Recommended transducer incline angle

backing
block	slope of hull
	deadrise
hull	angle
	parallel to
	waterline
	fairing
fairing thickness
at narrowest point	multisensor
6–12mm (1/4–1/2")

Deadrise angle and fairing thickness (B44V shown)

Maintaining the transducer

Using anti-fouling paint

FIGURE 3: Typical finished thru-hull installation with a fairing

block (Airmar B744V)

Do not expose the transducer’s face or plastic housing to gasoline or strong solvents, such as acetone. These solvents can penetrate and degrade many plastics and reduce their strength.

The transducer should be coated with water-based anti-fouling paint to prevent aquatic growth.

PAGE 8 491 INSTALLATION MANUAL Revision A