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Corrosion of a steel or alu-
minium thrust tunnel can be
reduced by ensuring that
the tail piece is completely
insulated from the thrust-
tunnel.
NOTE: The gaskets sup-
plied are already electrical-
ly insulated. However the
bolts and the shaft need to
be fitted with insulation
material, for example nylon
bushes. ( ).
Installation
For installation examples see page 49.
For outside dimensions see page 52.
Installation of the thrust tunnel
Drill 2 holes into the ship's
hull, where the centerline of
the thrust tunnel will be, in
accordance with the diame-
ter of the marking tool.
Pass
the
marking
tool
(home-made) through both
pre-drilled holes and set out
the outside diameter of the
thrust-tunnel to the hull.
Dependent on the vessel's
construction material, cut
out the holes by means of a
jigsaw or an oxy-acetylene
cutter.
Install the thrust-tunnel.
12
020530.04
Polyester thrust tunnel:
Resin: The resin used for the polyester thrust tunnel is
Isophtalic polyester resin (Norpol Pl 2857).
Pre-treatment: The outside of the tunnel must be rough-
ened.
Remove all of the top surface down to the glass-fibre. Use
a grinding disc for this.
Important: Treat the end of the tunnel, after it has been
sawn to length, treat the end of the tube with resin. This
will prevent water seeping in.
Laminating: Apply a coat of resin as the first coat. Lay on
a glass-fibre mat and impregnate with resin. Repeat this
procedure until you have built up a sufficient number of
layers.
A polyester thrust tunnel
should be finished as follows:
Roughen the hardened resin/
glass-fibre. Apply a top coat
of resin. Treat the side of the
tunnel which comes into con-
tact with water with 'epoxy
paint' or 2-component polyurethane paint.
Then apply anti-fouling treatment if required.
Drilling the holes in the thrust-tunnel
Mark the installation position
of the bow thruster by means
of the intermediate flange.
Use the drill pattern supplied,
to determine the correct posi-
D = 110 mm
tion of the holes to be drilled.
(4.3")
Important: The pattern of the
holes must be positioned pre-
cisely on the centerline of the
tunnel.
Drill the holes through the
thrust tunnel and take care
that the holes are free of burrs.
Operation manual and installation instructions Bow thruster 25 kgf, ø 110 mm
D = 28,5 mm
(1
1
/
")
8
d
= 6,5 mm
1
(
1
/
")
4
d
= 8,5 mm
2
(0.33")
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