Shortening the retraction tank
The retraction tank is 1300 mm in length when supplied. Shorten the tank as necessary so that the transducer is placed well below the keel when it is lowered. The following table provides guidelines for shortening the tank. Refer also to the retraction tank installation drawing at the back of this manual.
Installation Method
XDCR Travel
DD
800 mmRemove 297 Same as left thru 382 mm
from the bottom.
1200 mmRemove 97 Same as left thru 382 mm
from the bottom.
Remove 297 thru 382 mm from the bottom. Note that the length "D" must be less than 1003 mm.
Remove 97 thru 382 mm from the bottom. Note that the length "D" must be less than 1203 mm.
Same as left
Same as left
1600 mm | Remove within Same as left | Remove within |
| 282 mm from | 282 mm from |
the bottom. | the bottom. | |
Note that the length | ||
| ||
| "D" must be less | |
| than 1703 mm. |
Same as left
Figure 3-3 Guidelines for shortening the retraction tank
Note 1: In the 800 mm type hull unit, more than 297 mm must be removed from the bottom so that the transducer fully protrudes from the tank. If more than 382 mm is removed, the trans- ducer cannot be retracted into the tank.
Note 2: In the 1200 mm type hull unit, the transducer will not fully protrude unless 97 mm is removed from the bottom, and cannot be fully retracted if more than 382 mm is removed.
Note 3: In the 1600 mm type hull unit, the transducer cannot be fully retracted if more than 282 mm is removed.
Note 4: When 382 mm (282 mm for 1600 mm type) is removed and “D” is minimum, the effect of air foam is minimized because the transducer fully protrudes in water.
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