Airmar Shorty™ with Valve—S300 User Manual download pdf (Page 2)

• Fin keel sailboats—Mount on or near the centerline and

forward of the fin keel 300–600mm (1–2').

• Full keel sailboats—Mount amidships and away from the keel

at the point of minimum deadrise angle.

• Displacement hull powerboats—Locate amidships near the

centerline.

• Planing hull powerboats—Mount well aft to insure that the

sensor is in contact with the water at high speeds.

Anti-fouling Paint

Aquatic growth can accumulate rapidly on the sensor’s surface

reducing performance within weeks. Surfaces exposed to salt

water must be coated with anti-fouling paint. Use water-based

anti-fouling paint only. Never use ketone-based paint, since

ketones can attack many types of plastic possibly damaging the

sensor.

It is easier to apply anti-fouling paint before installing the sensor,

but allow sufficient drying time. Reapply paint every 6 months or

at the beginning of each boating season. Paint the following

surfaces (see Figure 1):

• Outside wall of the paddlewheel insert below the lower O-ring

• Paddlewheel cavity

• Paddlewheel

• Bore of the housing up 30mm (1-1/4")

• Exterior flange of the housing

• Blanking plug below the lower O-ring including the exposed end

Installation

Cored fiberglass hull—Follow separate instructions on page 3.

Hole Drilling

1. Drill a 3mm or 1/8" pilot hole from inside the hull. If there is a rib,

strut, or other hull irregularity near the selected mounting

location, drill from the outside.

2. Using a 51mm or 2" hole saw, cut a hole perpendicular to the

hull from outside the boat.

P398—This flush model requires countersinking the housing to

create a “seat” in the hull.

3. Sand and clean the area around the hole, inside and outside, to

ensure that the sealant will adhere properly to the hull. If there is

any petroleum residue inside the hull, remove it with either mild

household detergent or a weak solvent (alcohol) before sanding.

Metal hull—Remove all burrs with a file and sandpaper.

Bedding

Apply a 2mm (1/16") thick layer of marine sealant around the

flange of the housing that contacts the hull and up the sidewall of

the housing. The sealant must extend 6mm (1/4") higher than the

combined thickness of the hull, any washer(s), and the hull nut

(see Figure 2). This will ensure there is sealant in the threads to

seal the hull and hold the hull nut securely in place.

Installing

1. From outside the hull, push the housing into the mounting hole

using a twisting motion to squeeze out excess sealant. Align the

arrow on the flange of the housing pointing forward toward the

bow (see Figure 2). If the sensor is not installed on the centerline

of the boat, angle the housing slightly toward the centerline to

align it with the water flow.

2. From inside the hull, slide any washer(s) onto the housing.

NOTE: Some installations do not have a washer.

Aluminum hull less than 6mm (1/4") thick—Use an additional

rubber, plastic, or fiberglass washer. Never use wood, since it

will swell, possibly fracturing the plastic housing. Never use

bronze, since electrolytic corrosion will occur.

3. Screw the hull nut in place, being sure the notch on the upper

rim of the housing is still positioned forward toward the bow. Do

Figure 2. Bedding and installing—low profile shown

hull

safety

cap nut

hull nut

sealant on flange

paddlewheel

arrow

and side wall

washer

wire

large

O-ring

detail

key

small

O-ring

Figure 3. Paddlewheel insert—no paddlewheel shown

notch

(some

installations)

insert

housing

Figure 1. Anti-fouling paint—low profile shown

paddlewheel

cavity

paddlewheel

bore of housing

exterior flange of housing

outside wall below

lower O-ring

paddlewheel

up 30mm (1-1/4")

insert

housing

BOW ►

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Airmar Shorty™ with Valve—S300 User Manual Page 2

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