Airmar P39 User Manual

INSTALLATION INSTRUCTIONSOWNER’S GUIDE &

Transom-Mount with Release Bracket

Transducer or TRIDUCER

Model P39

U. S. Patents: 5,606,253

WARNING: Always wear safety goggles and a dust mask when installing to prevent personal injury.

WARNING: When the boat is placed in the water, immediately check for leaks around the screws and any other holes drilled in the hull.

17-297-01 rev. 02 01/02/11

CAUTION: Never pull, carry, or hold the transducer by the cable as this may sever internal connections.

CAUTION: Never strike the transducer with anything except the palm of the hand. Never strike the paddlewheel.

CAUTION: Never use solvents. Cleaners, fuel, paint, sealants, and other products may contain strong solvents, such as acetone, which attack many plastics greatly reducing their strength.

IMPORTANT: Please read the instructions completely before proceeding with the installation. These instructions supersede any other instructions in your instrument manual if they differ.

Applications

• Not recommended for boats with large inboard engine(s).

• Good operation up to 44kn (50MPH)

• Vertically orients sound beam on hull with deadrise angle up to 30°

• Adjusts to transom angles from 2

• Bracket protects transducer from frontal impact only

Tools & Materials

Safety goggles Dust mask Pencil Electric drill Drill bits:

Bracket holes 4mm, #23, or 9/64" Transom hole (optional) 18mm, 11/16", or 3/4" Cable clamp holes 3mm or 1/8"

Masking tape Angle finder Grommets (some installations) Marine sealant (suitable for below waterline) Screwdrivers Straight edge Cable ties Water-based anti-fouling paint (mandatory in salt water)

° –22°

Multisensor

Record the information found on the cable tag for future reference.

Part No._________________Date___________Frequency________kHz

P39 TRIDUCER®

multisensor

Mounting Location

CAUTION: Do not mount in an area of turbulence or bubbles:

near water intake or discharge openings; or behind strakes, struts, fittings, or hull irregularities

CAUTION: Avoid mounting the transducer where the boat may be supported during trailering, launching, hauling, or storage.

• For the best performance, the transducer must be in contact with smooth water. To identify an area of “clean” water, observe the water flow off the transom while the boat is underway.

• Allow headroom space above the bracket for it to release and rotate the transducer upward (see Figure 1).

• Mounting on the starboard side of the hull where the propeller blades are moving downward is preferred.

• Mount the transducer as close to the centerline (keel) of the boat as possible to ensure the transducer remains in the water when the boat is turning.

- Single drive boat—Mount at least 75mm (3") beyond the

swing radius of the propeller (see Figure 2).

- Twin drive boat—Mount the transducer between the drives.

NOTE: Starboard side of hull where propeller blades are moving downward is preferred.

headroom

Headroom NO speed sensor 109mm (4-5/16")

Headroom with speed sensor 130mm (5-1/8")

Figure 1. Stepped transom

headroom required

Figure 2. Mounting location

on single drive boat

75 mm (3") minimum beyond swing radius

transducer

Figure 3. Mounting the transducer on the bracket

Installation

pivot post (2)

slot (2)

bracket

Compensating for Transom Angle: Shim

For the best performance, the transducer beam must be aimed straight at the bottom. Since the transom of most boats is angled, the bracket must compensate for it. Measure the transom angle of the boat with an angle finder.

• Standard transom (13° transom angle)—The bracket is designed for a standard 13° transom angle. The shim is not needed for this installation. Skip to “Mounting the Bracket”.

• Stepped transom and jet boats (3° transom angle) —Use the shim with the taper down. Place the nuts in the slots in the back of the bracket (see Figure 5). Snap the shim into place.

• Small aluminum and fiberglass boats (20° transom angle)— Use the shim with the taper up (see Figure 5). Place the nuts in the slots in the back of the bracket. Snap the shim into place.

• If you are unsure about using the shim—Experiment with the shim by following the instructions “Mounting the Bracket” and “Checking the Transducer Angle and Projection.”

Attaching the Transducer to the Bracket

1. Insert the transducer’s pivot posts into the slots in the back of the bracket (see Figure 3).

2. With the screw holes aligned, rotate the transducer until it snaps onto the bracket.

Hole Drilling

CAUTION: To prevent drilling too deeply, wrap masking tape around the bit 22mm (7/8") from the point.

NOTE: Fiberglass hull—Minimize surface cracking by running the drill in reverse until the gelcoat is penetrated.

1. At the selected location position the transducer, so it projects 3mm (1/8") below the bottom edge of the transom (see Figure 4).

2. Be sure the bottom of the transducer is parallel to the waterline. Using a pencil, trace the bottom of the bracket and both corners onto the hull.

3. Remove the transducer and hold the shim against the outline you have drawn. Mark the screw holes with an “X” in the center of each slot.

4. Using a 4mm, #23, or 9/64" drill bit, drill two holes 22mm (7/8") deep at the locations indicated.

Mounting the Bracket

1. Insert the two, lock nuts in the slots in the back of the bracket if this has not been done (see Figure 5).

2. Apply marine sealant to the threads of the two, #10 x 1-3/4", self-tapping screws to prevent water seepage into the transom.

3. Screw the bracket (with the shim if needed) to the hull.

Do not tighten the screws at this time.

Checking the Transducer Angle & Projection

CAUTION: Do not position the leading edge of the transducer lower than the trailing edge because aeration will occur.

CAUTION: Do not position the transducer farther into the water than necessary to avoid increasing drag, spray, and water noise and reducing boat speed.

1. Using a straight edge, sight the underside of the transducer relative to the underside of the hull (see Figure 6). The trailing edge of the transducer should be 1–3 mm (1/16 – 1/8") below the leading edge or parallel to the bottom of the hull.

2. Using the vertical adjustment space in the bracket slots, slide the transducer up or down (see Figure 4). Be sure the bottom left corner of the transducer projections 3 mm (1/8") below the bottom of the hull.

3. When you are satisfied with the position of the transducer, tighten the bracket screws.

cable cover

cable clamp

50mm (2")

parallel to

Hull projection 3mm (1/8")

Figure 4. Vertical adjustment and cable routing

waterline

cable

screw

detail

of shim

(actual size)

slot

screws (#10 x 1-3/4" self-tapping)

transducer

bracket screw (actual size)

Figure 5. Mounting the bracket with shim (20

lock nuts

shim (taper up)

•

transom angle shown)

+ 2 hidden pages

Airmar P39 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual