020806.01
23
vetus®
Installation instructions BOW PRO Series Thrusters: BOWA0651, BOWA0762 and BOWA0902
180º
Max. bilge
water level
3 .2 Positioning of the bow thruster in the thrust-tunnel
When determining the exact position of the bow thruster in the
thrust tunnel, the tailpiece MUST NOT protrude from the tunnel end.
The electric motor can be installed in various positions.
If the motor is installed horizontally, a support MUST be fitted.
The electric motor must be positioned in such a way that it is always
well clear from the maximum bilge water level.
The propeller should preferably be situated on the centreline of the
vessel, but it must always be accessible from the outside.
D
L
=
α
α
: min. 0º
max. 15º
D = 185 mm (7
5
/
16
”)
L = 200 ... 600 mm (8...24”)
A
D
D = 185 mm
(7
5
/
16
”)
R = 20 mm
(
3
/
4
”)
C = 20 ... 30 mm
(
3
/
4 ...
1
3
/
16
”)
R
R
B
C
C
3 .3 Connection of thrust tunnel to ship’s hull
t
ip
:
The manner, in which the thrust tunnel is connected to the hull,
has a great influence on the actual performance of the bow
thruster and to the drag the hull experiences when underway.
Direct connection of the tunnel to the hull, without a fairing, pro-
duces reasonable results.
A
The connection to the hull can be abrupt.
B
It is better to make the connection rounded with radius ‘R’ of
about 0.1 x D.
C
It is even better to use sloping sides ‘C’ with dimensions 0.1 to
0.15 x D.
D
R
R
C
A
B
C
D = 185 mm
(7
5
/
16
”)
R = 20 mm
(
3
/
4
”)
C = 20 ... 30 mm
(
3
/
4 ...
1
3
/
16
”)
Connection of the thrust tunnel to the ship’s hull with a fairing results
in lower hull-resistance during normal sailing.
If the connection of the thrust
tunnel and the boat's hull is to be
made with a sloped side, it should
be executed in accordance with
the drawing.
Make the sloped side (C) with a
length of 0.1 to 0.15 x D and make
sure that the angle between the
tunnel and the sloped side will be
identical to the angle between the
sloped side and the ship’s hull.
C
C
β
γ
γ
β
Sharp
C = 20...30 mm (
3
/
4
...1
3
/
16
”)
D = 185 mm (7
5
/
16
”)
β
=
β
γ
=
γ
A
The connection with a fairing can be abrupt.
B
It is better to make the connection with a fairing rounded with
radius ‘R’ of about 0.1 x D.
C
The best connection is with a fairing using sloping side ‘C’ with
dimensions 0.1 to 0.15 x D.
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.
ENGLISH
