artisan TRACKPOINT 3 4211A, Operation And Maintenance Manual

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TRACKPOINT 3 INSTALLATION
2-2
2.1.1 4610B SUGGESTED HYDROPHONE MOUNTING ASSEMBLY
The main function of the mounting assembly is to support the hydrophone vertically in the water.
Mount it at reasonable distance from the vessel's hull and below the level of the keel. The mount-
ing should be rugged enough to withstand the expected forces during the planned operation, and
easy to raise and lower. The type and size of the mounting recommended for the TrackPoint 3
hydrophone varies with the size of the surface vessel and the intended application.
The Model 4610B Hydrophone is supplied with a universal mounting bracket. The mounting
bracket attaches to the end of a suitable length of pipe. Choose the size and material of the pipe
according to the application. With the system in operation and underway at several knots, a five or
six-inch schedule 80 steel pipe with angle-iron fairings is recommended. On small vessels, the
TrackPoint 3 has been used with the hydrophone mounted to a two-inch aluminum pipe. Figure 2-1
illustrates a suggested mounting arrangement typical for slow-speed operation. Refer to drawing
100909 for mounting flange dimensions.
In the suggested mounting illustrated in Figure 2-1, a length of pipe with an inner diameter slightly
greater than 3 inches is permanently attached to the deck. A length of pipe with a 3-inch outer di-
ameter, permanently attached to the mounting pole, is fitted into the larger pipe and secured with
a locking pin. This secures the mounting pipe to the vessel for use, but allows the pipe to be re-
moved if necessary.
A support plate near water level helps secure the pipe in a vertical position. The angle iron on the
underwater portion of the pipe adds stiffness and reduces vibration.
The mounting bracket and hydrophone are attached to the lower end of the pipe with eye bolts.
The pipe has forward and aft guys leading from the point of attachment and secured on deck to
prevent bending or swaying.
In general, consider the following when designing the hydrophone mounting.
1. The mounting pipe should be long enough to position the hydrophone below the vessel keel
when in the vertical position.
2. The pipe used should be stiff enough to prevent vibration or strumming when the vessel is
underway.