Specifications

BATS AND PORTABLE BATS INSTALLATION
2-2
2.1.1 4213C SUGGESTED HYDROPHONE MOUNTING ASSEMBLY
The main function of the mounting assembly is to support the hydrophone vertically in the water
and orient it with respect to the bow of the vessel. See Figure 2-1 for Hydrophone dimensions.
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 BATS Hydro-
phone varies with the size of the surface vessel and the intended application.
Transiting to/from operating locations with the hydrophone deployed is not recommended.
In general, consider the following when designing the hydrophone mounting.
1. The mounting pipe should be long enough to position the hydrophone below the ves-
sel keel when in the vertical position.
2. The pipe used should be stiff enough to prevent vibration or strumming when the
vessel is underway.
3. Attach the pipe to the side of the vessel so that the pipe and hydrophone assembly
can be easily removed and set on board, if required, to tie the vessel up alongside
other vessels or at dockside.
4. The entire assembly should be easy to raise and lower with available manpower or
winches.
5. Hydrophone heading (referenced by the index mark) should align with vessel head-
ing. The mount should be fabricated to allow the rotation of the hydrophone to cor-
rect for any bearing misalignment during installation (see section 2.4.1 Bearing Off-
set Adjustment). Some locking arrangement should be used to maintain the calibrat-
ed bearing.
6. Forward and aft guys are used to hold the mounting pipe in vertical position.
See Figure 2-2 for example of mounting arrangement.
The Model 4213C Hydrophone can be mounted to an angle bracket which mounts to the end of a
suitable length of pipe or assembled into a machined end of pipe or shaft. Choose the size and ma-
terial of the pipe according to the application. The Hydrophone can survive up to 10knots as long
as shaft/pipe does not strum or vibrate.