4
depending on the thickness and quality of the glass fibre. The in
Hull Kit is available direct from NASA Marine or your local
chandler.
Whichever method is selected, the best location still has to be
found.
Select a position below the water level where the transducer
will point substantially vertically downwards towards the
seabed, and where the transducer and its cable (do NOT
shorten the transducer cable) will be well clear of equipment
which might be a source of interference. Such sources might
include the engine ignition and starting systems, alternators
and dynamos, electric pumps, etc. This position should also
be well clear of large masses of bubbles or cavitation near
propellers or sudden changes in hull profile which could
disrupt the signal.
To test the suitability of the location when the vessel is in the
water at a reasonable depth, press a little sticky chewing gum on
the surface of the transducer and stick it down to the inside of the
hull (it may be necessary to remove dirt and oily residue first).
The unit can then be tested over a range of speeds and depths.
If the location is satisfactory, the chewing gum must be removed
and the transducer permanently mounted using one of the
methods described previously. (Note: do NOT shorten the
transducer cable).
It is important that the face of the transducer is thoroughly bonded
down to the hull. A single air bubble will cause a considerable loss
in performance.
The transducer and the place of mounting must be kept entirely
free of any antifouling compound as this can also effect the
performance of the unit.
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