6
2933
4
2019
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SH 240 & SH 320
Positioning of the Retract thruster
EN
MC_0067
The thruster must always be installed so the hatch is opened towards the direction of travel.
Bow
The thruster must be installed as far forward as possible. Allow for 10cm around the thruster for moulding the retract frame and the depth of the
retracted propeller is 185mm (SR 80/100), 250mm (SR 130/210) or 300mm (SR 250/300) under the water line. For bow installations, the thruster must
be installed in the centre line of the keel.
(NB: Installing the thruster further forward will give less depth for the propeller but off er better leverage
eff ect for turning.)
Stern
Follow the same depth requirement for the retracted propeller of 185mm (SR 80/ 100), 250mm (SR 130/ 210) or 300mm (SR 250/ 300) under the
water line. The thruster while retracted must not confl ict with any other component of the vessel such as stern drives/ propellers, trim tabs or rudders.
Therefore stern installations do not require to be installed on the hulls keel centre line and can be installed off centre.
Installing the thruster below the waterline as outlined is important for two reasons:
1. So that it does not suck air down from the surface which will reduce performance and increase noise levels.
2. To get as much water pressure as possible to receive maximum effi ciency from the thruster.
Always ensure enough space for the complete SR unit including motor, actuators, retract frame, future service and for installation moulding to the hull.
MG_0181
Minimum tunnel depth
SR 80 & 100 = 185mm
SR 130 & 210 = 250mm
SR 250 & 300 = 300mm
Hatch opens towards the
direction of travel
Thruster moved to
avoid confliction
Thruster moved to
avoid confliction
Stern Installation
Bow Installation
WATERLINE
