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Are there any core areas in the hull of a 1975 DE 38. I am installing a "shoot the hull" transducer and having issues. I am experienced at this and never had issues with other non-cored hulls......Cannot find but one reference to core in the hulls of Moreschladt designed boats. Thanks.
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DELibertad_WI38 said
Are there any core areas in the hull of a 1975 DE 38. I am installing a "shoot the hull" transducer and having issues. I am experienced at this and never had issues with other non-cored hulls......Cannot find but one reference to core in the hulls of Moreschladt designed boats. Thanks.
To the best of my knowledge this is no core anywhere in the hull of any Downeaster. The decks yes! but the hull no. I have replaced through hulls and even filled and drilled new holes for them through the hull and it was solid fiberglass every place I have done that.
I have seen issues with the plywood backing plates of through hulls rotting and going soft. We replaced the plywood with 1/2 inch of solid fiberglass epoxied to the inside of the hull and the through hulls bedded with 5200.
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Thank you... This is just the input I needed....must have some trapped air in my application........I took the transducer off my previous boat where it was also mounted inside the hull....maybe not cleaned well enough before remounting. What confused me was one post on a blog somewhere that stated some DE38's had cored hulls......I was shocked as none of my research prior to buying the boat indicated any core in the hull; the only core being the colonite in the topsides.....Many Thanks......
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The hull is also really thick closer to the centerline. Though I have not heard any reports of this on any DE it is possible that one of the layers of glass didn't get wetted out enough and there is a small area of drier cloth in the laminate schedule that is creating a air bubble in that location. easiest way to test sections of the hull is to create a cofferdam of clay or other substance or pipe glued to the hull right there. Then fill with water or oil and drop transducer in and test. Some people call for your permanent installation to have the transducer in a fitting that is epoxied to the hull with water or oil permanently in it that your transducer transmits through.
The only times I have done this with a transducer I simply epoxied it directly to the hull and that worked well. This was in a smaller 24 ft boat with a hull that was only about 1 inch thick if that in that location.
Good luck troubleshooting it. 
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My last boat had a transducer that read through the hull and it was in a mineral oil bath. It stopped working after she was blown off the jacks in a hurricane and it took two trips to the repair facility to figure out that the transducer was fine but I needed .20 of mineral oil as it has poured out when she was on her side. Other than that, the oil bath worked great. Pretty sure there can't be any air between the equipment and the hull as might happen in a new installation.
Good luck!
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