Lewmar TT 140 - Installation; Choosing Location; Preparing the Hole for the Tube

5
Electric/Hydraulic TT Thruster 140 - 300
GB
1. Installation
1.1 Choosing location
The actual position of the Thruster will depend on the internal &
external construction of the Motor Boat or Sailing Yacht.
Ø = Tunnel Diameter.
For optimal performance the Thruster should be mounted within
the following:
• As far forward as possible (Fig 1.1.1 lever effect).
Fig. 1.1.1
• 1 x Ø below the waterline to prevent air being sucked into the
tunnel. (Fig. 1.1.2 0.75 x Ø minimum.).
• Minimum suggested tunnel length 2 x Ø.
NOTE: Ensure there is suffi cient space
for the Thruster assembly complete with
motor and controls in the boat.
Ø
Min. 100 mm (4")
Min. 0.75 Ø
OPTIMUM AREA
Fig. 1.1.2
• The recommended tunnel is designed to fi t a Lewmar saddle,
take the weight of the Thruster and the torque of the motor.
• Fig 1.1.4 - To reduce any potential loss of performance or
damage to the propeller the entrance of the tunnel can be
altered to improve thrust as well as reduce noise.
• TT Thruster can be fi tted new or as a replacement for an
existing thruster (see Fig 1.1.3).
NOTE: Check mounting holes on the saw template.
Fig. 1.1.3
Fig. 1.1.4
1.2 Preparing the hole for the tube
When you are satisfi ed the best location for the Thruster unit has
been found within the parameters available proceed as follows.
• Fig 1.2.1 - Make a jig to precisly align the drill holes either
side of the hull.
NOTE: Double check everything before drilling.
• Drill a pilot hole in both sides of the hull.
Thruster Model (kW)
Thruster I.D.
mm (inch)
Wall
mm (inch)
140 140 (5
1
/
2
) 4.0 (
5
/
32
) - 5.0 (
3
/
16
)
185 (3.0 & 4.0) 185 (7
9
/
32
) 4.0 (
5
/
32
) - 6.0 (
1
/
4
)
185 (5.0 & 6.0) 185 (7
9
/
32
) 6.0 (
1
/
4
)
250 250 (9
27
/
32
) 7.5 (
9
/
32
)
300 300 (11
13
/
16
) 9.0 (
11
/
32
)
A competent, marine engineer must carry out any work on the
hull of your boat.
The boat MUST be out of the water, levelled and secure in its
cradle.
This section is for general guidance for GRP boats only. Problems
caused by faulty installation of the tunnel are the installers full
responsibility.
A competent, marine engineer must carry out any work on the hull
of your boat.