Connection Of Thrust Tunnel To Ship's Hull - Vetus RimDrive RD125 Instructions D'installation

5

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.
N.B. A scallop is mainly used in the hull of steel vessels, but is less common in GRP boats.
D
The connection with a fairing can be
abrupt.
Thruster
'RD . . . . .'
RD125
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.
24
020574.03
R
It is better to make the connection rounded
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.
[mm]
RD160
250
RD125
t :
ip
R
R
D
(inches) [mm]
(9 13 / ") 25
16
L D
α
Thruster
'RD . . . . .'
RD160
vetus® Installation instructions thruster RIM DRIVE 250 mm
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.
R
(inches) [mm]
(1") 25 ... 38
L = 1 x D ... 3 x D
=
α : min. 0º
max. 15º
D
[mm]
250
C
(inches)
(1 ... 1 1 / ")
2
L
[mm]
250 ... 750