Hull Construction

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Dec 19, 2005
12
Oday 25 Gulfport, Fl
The transducer supplied with my new Hawkeye depth sounder requires a solid fiberglass hull with no wood, air or other voids in the installation position of the transducer. Is there such a position in my 1986, 27' standard rig catalina sloop? I've tried five locations just below the waterline but haven't been successful in finding a solid fiberglass spot that allows a transmission through to the transducer. Help!!!!
 
Feb 6, 1998
11,711
Canadian Sailcraft 36T Casco Bay, ME
The transducer supplied with my new Hawkeye depth sounder requires a solid fiberglass hull with no wood, air or other voids in the installation position of the transducer. Is there such a position in my 1986, 27' standard rig catalina sloop? I've tried five locations just below the waterline but haven't been successful in finding a solid fiberglass spot that allows a transmission through to the transducer. Help!!!!
Fill a ziplock baggie with water and set the transducer on that when testing the hull location. Transducers can not read air and by sliding it around the inside of the hull you will get air readings. The ziplock bag conforms to the hull and leaves you with less potential of air voids.

C-27 are solid glass hulls but they can have voids you just need to find a good clean solid spot..
 
Dec 2, 2003
392
Catalina 350 Seattle
Your entire hull is solid fiberglass. The only areas where Catalina uses a core inside of the glass are in the deck areas - where they are typically cored with Plywood.

On my 1986 C27, I mounted the depth transducer inside the hull, just forward of the waste tank, under the V-berth. That location is forward of the keel.

The commonly accepted practice for finding a good location for an in-hull transducer is to place the transducer in a ziplock bag full of water and then experiment with various locations. Once you find a location that works, mix up your epoxy (or some use silicone sealant) and apply liberally to the transducer and press against the hull. You don't want any air trapped between the transducer and the hull.

Good Luck!

Tim Brogan
April IV C350 #68 (was Inamorata C27 #6111)
 
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