Join Date: Feb 2007
Location: aboard, Malaysia
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We have ST40 and we utterly hate through-hulls (when we bought the boat, we removed 7, keeping only 3). The 'shoot-thru' installation has it's perks, but it should, as far as I understand it, work with any transducer.
Catch 1: your boat cannot have cored hull, as SD pointed out. If it does you have to haul out, cut out a piece and glass the hole. The signal has to go through homogeneous material and the air in the cored hull would bounce it back.
Catch 2: you can't install it anyplace. There might be air bubbles in the glass. Setup your system, put the transducer in a bag full of water and look for a spot where it gives you good signal. Naturally you should first find out what's the depth under your boat at that time. The transducer does really have to be 100% perpendicular.
I suppose you know the rest: create a container from a pipe, glue it to the hull, fill it with water (some suggest oil, soapy water..., but that's messy and plain water works just fine), secure the transducer.
Petr & Jana
s/y Janna, HR 31 Monsun
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