Guide to Sandwich and Cored Hulls
Ultrasonic transducers must make direct contact with the outer skin of the hull. For hulls constructed with a foam sandwich or other core, a small area of this material must be removed to expose the outer skin.
A 150mm (6") diameter cut out (approx) is recommended as this will allow room to prepare a flat and smooth surface before bonding the transducer ring. The cut edge should be sealed with a gel wash coat or epoxy based filler to prevent water ingress.
It is recommended that this type of installation is carried out when the boat is out of the water.
Picture from installation on Sadler 34 with a foam core hull construction.
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