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Corrosion of a steel or alu-
minium thrust tunnel can be
reduced by ensuring that the
tail piece is completely insu-
lated from the thrust-tunnel.
NOTE: The gaskets supplied
are already electrically insu-
lated. However the bolts and
the shaft need to be fitted
with insulation material, for
example nylon bushes.
(* ).
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.
14
020569.01
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
should be finished as follows:
Roughen the hardened resin/
glass-fibre. Apply a top coat of
resin. Treat the side of the tun-
nel 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 drill pattern supplied,
D = 320 mm
to determine the correct posi-
(12.60")
tion 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.
Operation manual and installation instructions Bow thruster 285 kgf, ø 300 mm
polyester
thrust
tunnel
D = 60 mm
(2
3
/
")
8
d = 9,0 mm
(0.5")
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