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476671/B
About the hull unit installation
The hull unit is used to lower the transducer down below the ship’s hull when the MF90
system shall be used. When the MF90 system is turned off, the transducer is hoisted for
protection. The hull unit is large and crucial part of the sonar system.
The MF90 system can be provided with one of the following hull units:
Hull Unit
Lowering depth (m)
Transducer cables (m)
Maximum speed
(knots)
4.6
MF90
1.0
10
20
4.6
MF94
2.1
7
19
Note
Due to its physical size and weight, and the fact that the installation trunk penetrates the
vessel hull, it is very important that the hull unit is installed and secured properly. The hull
unit gantry must be secured to the bulkhead by means of mechanical support brackets.
The dimensions and strength of the support brackets must be adequate to prevent vortex
induced vibrations. This is an invariable requirement to ensure the safety of the MF90
system and the vessel.
The hull unit shall be mounted on top of the installation trunk at the bottom of the hull. The
installation trunk penetrates the ship’s hull, and allows the transducer to be lowered into the
sea. The hull unit is normally located in the forward part of the vessel.
As a general recommendation, the hull unit shall be oriented with the hoisting motor
pointing aft. If this orientation makes it difficult to access electrical connections, the hull
unit may be rotated during its installation to the most suitable direction.
Appropriate lifting equipment (lifting tackle, portable crane or ship’s crane) is required. Free
access through the hull or the decks over the installation trunk must be provided.
Topics
Mechanical support of the hull unit gantry, page 101
O-ring/Rubber gasket, page 102
Design and installation drawings, page 103
Hull unit installation example: Top view, page 104
Hull unit installation example: Side view (on keel), page 106
Hull unit installation example: Side view (off keel/without blister), page 107
Simrad MF90 Installation Manual
Summary of Contents for Simrad MF90
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