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Connection of thrust tunnel to ship's hull
The manner, in which the thrust tunnel is connected to the ship's hull, is of great influence to the actual performance of the bow thruster
and to the drag that the hull produces when under way.
Direct connection of the tunnel to the hull, without a fairing, produces reasonable results.
D
The connection to the hull can be abrupt.
Connection of the thrust tunnel to the ship's hull with a fairing results in lower hull-
resistance during normal sailing.
D
The connection with a fairing can be
abrupt.
Thruster
'BOW . . . . .'
25 . . .
45 . . .
35 . . .
55 . . .
60 . . .
75 . . .
95 . . .
125 . . .
160 . . .
220 . . .
230 . . .
285 . . .
410 . . .
550 . . .
Length 'L' of the fairing should be between 1 x D and 3 x D.
This fairing should be embodied in the ship's hull in such a way that
the centreline of the fairing will correspond with the anticipated
shape of the bow-wave.
Thruster
'BOW . . . . .'
25 . . .
45 . . .
35 . . .
55 . . .
60 . . .
75 . . .
95 . . .
125 . . . 160 . . .
220 . . . 230 . . . 285 . . . 310 . . .
410 . . . 550 . . .
14
020571.03
R
It is better to make the connection round-
ed with radius 'R' of about 0.1 x D.
R
It is better to make the connection with a
fairing rounded with radius 'R' of about 0.1
x D.
D
[mm]
(inches)
110
(4
5
125
(4
15
150
(5
185
(7
5
250
(9
13
310 . . .
300
(11
13
400
(15
D
[mm]
(inches)
[mm]
110
(4
5
/
")
110 ... 330 (4
16
125
(4
15
/
")
125 ... 375
16
150
(5
7
/
")
150 ... 450
8
185
(7
5
/
")
200 ... 600
16
250
(9
13
/
")
250 ... 750
16
300
(11
13
/
")
300 ... 900
16
400
(15
3
/
")
400 ... 1200
4
T
:
ip
R
R
R
[mm]
(inches)
/
")
11
(
16
/
")
13
16
7
/
")
15
8
/
")
20
16
/
")
25
16
/
")
30
1
16
3
/
")
40
1
4
L
(inches)
1
/
... 13")
2
(5 ... 15")
(6 ... 18")
(8 ... 24")
(10 ... 30")
(12 ... 36")
(16 ... 48")
C
It is even better to use sloping sides 'C' with
dimensions 0.1 to 0.15 x D.
C
The best connection is with a fairing using
sloping side 'C' with dimensions 0.1 to 0.15
x D.
C
[mm]
7
/
")
11 ... 17
16
(
1
/
")
13 ... 19
2
(
5
/
")
15 ... 22
8
(
3
/
")
20 ... 30
4
(1")
25 ... 38
3
/
")
30 ... 45
(1
16
1
/
")
40 ... 60
2
L = 1 x D ... 3 x D
L
D
α
α : min. 0º
max. 15º
vetus® Installation recommendations for thrusters
(inches)
(
7
/
...
11
/
")
16
16
(
1
/
...
3
/
")
2
4
(
5
/
...
7
/
")
8
8
(
3
/
... 1
3
/
")
4
16
(1 ... 1
1
/
")
2
3
/
... 1
3
/
")
16
4
(1
1
/
... 2
3
/
")
2
8
=
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