05-18-2009, 01:34 PM
I have a Humminbird 798cSI on my Northwest Jet Lightning 218. I get normal high-speed fuzzies, but can easily track the bottom all the way up to about 50mph. I've got a prop version of the boat, but none-the-less the standard side-imaging transducer will work at high-speed if you get it mounted right. My hull is probably a deeper-v than yours (18 degrees) without the reverse chines. I had to go with dual transducers because I've got an extended transom that blocks the side imaging views. I've got the transducers mounted about 8 inches from edges of the bottom of the hull. They're mounted deep enough that I get a bit of a rooster tail. The port transducer only does the port side imaging. Everything else is done by the starboard transducer so I don't think the dual transducers are giving me any advantage on plane.
Make sure the back edge of the transducer is a bit deeper than the front and then keep lowering the transducer until you start tracking the bottom.
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Make sure the back edge of the transducer is a bit deeper than the front and then keep lowering the transducer until you start tracking the bottom.
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