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Originally Posted by zeelaagee
they physics of it sounds right- but i'm not sure i'm buying into this theory because a tansducer (from what i've read and heard) should operate without problems with a little bit of water in the area around the transducer (at least in testing situations)- and water is far less dense than MG or epoxy. is this something more critical for color display units than greyscale?
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This might help explain it better.
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Sound waves move faster through a denser medium because energy is more easily passed between tightly packed molecules. This helps explain why sound travels faster through water than through air, and faster still through steel than through water. But even more influential than a conducting medium's density is its elasticity. Elasticity refers to how well a medium can return to its initial form after being disturbed by a force. Steel has high elasticity. It bounces right back to its original shape after an applied force is removed. At the particle level, the molecules in elastic materials transfer energy more efficiently, so sound waves travel faster through steel than through water or air. But not all solids are good conductors of sound. Cork, for instance, has low elasticity. Its molecules tend to absorb energy rather than conduct it.
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Marine goop performs more closely to cork in this respect and will absorb energy / sound. But that same ability to absorb energy / sound allows it to absorb flexing in your kayak hull and prevent the transducer from popping off. That is why marine goop is so popular for kayak installations.
I hope this makes better sense.