14
2.0525
Operation manual and installation instructions Bow thruster 80 kgf, ø 185 mm
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, which
are standard supply, do not
provide electrical insulation
and should be replaced by
proper insulating material
(
☛ ➃
), such as, e.g., nylon
plate.
Installation
For installation examples see page 61.
For outside dimensions see page 64.
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.
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
contact 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 self-adhesive drill pat-
tern supplied, to determine
the correct position of the
holes to be drilled.
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.
D = 195 mm
(7.68”)
D = 30 mm
(1.18”)
d = 9,0 mm
(0.35”)
