Airmar P52 with Kick-up Bracket 20-035 - Manual (Page 2)

2
Mounting Location
CAUTION: Do not mount in an area of turbulence or bubbles:
near water intake or discharge openings; behind strakes, struts,
fittings, or hull irregularities
CAUTION: Avoid mounting the sensor where the boat may be
supported during trailering, launching, hauling, or storage.
• For the best performance, the sensor 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 sensor upward (see Figure 3).
• Mount the sensor as close to the centerline (keel) of the boat as
possible to ensure the sensor 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 4). The starboard
side where the propeller blades are moving downward is
preferred.
• Twin drive boat—Mount the sensor between the drives.
Installation
CAUTION: Do not position the leading edge of the sensor lower
than the trailing edge because aeration will occur.
CAUTION: Do not position the sensor deeper into the water than
necessary to avoid increasing drag, spray, and water noise and
reducing boat speed.
CAUTION: To prevent drilling too deeply, wrap masking tape
around the bit 22mm (7/8") from the point.
CAUTION: Fiberglass hull—Minimize surface cracking by
running the drill in reverse until the gelcoat is penetrated.
Mounting & Adjusting
1. Position the assembly at the selected location with the
transducer face parallel to the water. Good results can be
achieved on most boats when the bottom of the transducer is
about 6mm (1/4") below the bottom of the hull and parallel to the
waterline (see Figure 4).
2. With a pencil, mark the outline of the bracket slots on the hull.
Mark the screw location at the bottom of each slot to allow for
adjusting the bracket (see Figure 5).
3. Using a 4mm, #23, or 9/64" bit, drill three holes 22mm (7/8")
deep at the locations indicated.
4. Apply marine sealant to the threads of the three #10 x 3/4" self-
tapping screws to prevent water seepage into the transom.
Slide a flat washer onto each screw and fasten the assembly to
the hull. Do not tighten the screws completely at this time.
5. Using the vertical adjustment space on the bracket slots, slide
the sensor up or down to provide a projection of 6mm (1/4")
(see Figure 4). Tighten the screws.
6. Using a straight edge, adjust the angle of the transducer on the
bracket. Sight the underside of the transducer relative to the
underside of the hull (see Figure 6). Adjust the sensor on the
bracket so it is parallel to the bottom of the hull or at a slight
angle. For best results set the trailing edge of the transducer
1-3mm (1/16-1/8") below the leading edge (see Figure 7).
Tighten the screws.
Figure 4. Mounting location on single drive boat
50mm (2")
cable clamps
cable cover
Bottom parallel to water line
75mm (3") minimum beyond
swing radius of propeller
Figure 2. Transducer and bracket assembly (P37 shown)
#10-32 x 5/8"
flat washer (8)
lock nut (4)
mounting tabs
Figure 3. Height required at mounting location (P37 shown)
Height without Height with
Model paddlewheel paddlewheel
P52 175mm (7-1/2") 215mm (9")
height
transom
screw (4)
Hull projections:
fiberglass, wood 6mm (1/4")