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5
Installation of the thrust tunnel
Drill 2 holes into the ship's hull, where the
centreline of the thrust tunnel will be, in ac-
cordance with the diameter 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.
Thruster
'BOW . . . . .'
25 . . .
45 . . .
35 . . .
55 . . .
60 . . .
75 . . .
95 . . .
125 . . .
160 . . .
220 . . .
230 . . .
285 . . .
410 . . .
550 . . .
Dependent on the vessel's construction ma-
terial, 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 roughened. Re-
move all of the top surface down to the glass-fibre. Use a grinding
disc for this.
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 re-
quired.
16
020571.03
D [mm] (inches)
Steel
121
49
(4
/
")
64
134
(5
9
/
")
32
159
(6
17
/
")
64
194
(7
41
/
")
64
267
(10
33
/
")
64
320
310 . . .
(12
19
/
")
32
420
(16
17
/
")
32
GRP
Aluminium
120
120
13
13
(4
/
")
(4
/
")
32
32
136
—
(5
23
/
")
64
161
160
(6
11
/
")
(6
19
/
")
32
64
196
196
(7
23
/
")
(7
23
/
")
32
32
265
264
(10
7
/
")
(10
25
/
")
16
64
320
320
(12
19
/
")
(12
19
/
")
32
32
424
—
(16
11
/
")
16
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.
vetus® Installation recommendations for thrusters
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