What about hanging transducer over the stern as we intend to try? We are actually planning to install it at the bottom of a self steering
blade (Cape horn variant rather than our present Flemming gear) together with the engine
intake. This should be deep enough to remain submerged and only draw back we envisage is possible turbulance at speed. However at speed one shouldn't be relying on the depth sounder
anyway and you can always slow down to check depth as you would anyway coming into an anchorage. A hinged rod arrangment is another way to get it down deep enough at the stern.
Read on for how we got to this stage.
Ribbony: seems we have more in common. We also recently welded up all the hull penetrations (7 No! including the recessed transducer one) and now only have rudder
shaft (new mechanical and orig gland seals) and prop shaft (original inboard PSS seal+new mechanical outboard
Some have called us paranoid (well at least one of us ) but its a comforting thought we wont sink in a common way.
What about the engine
Plan 1 was to install a sea chest opening to cockpit
and engine inlet bsically as a pipe within a pipe. Outer pipe being the "hull" kept in a dry state by a noncorroding inner one. Also big enough to push down the transducer as well so we could raise it and clean it easily. We cut out the hole in cockpit
but had trouble machining the 100 dia. pipe which was going to form the outer wall of the chest. Time on the slip was up so back we went with plan 2 -a couple of new cockpit drains above waterline thru to transom. As yet we havent got an engine inlet, just a temporary garden hose over the stern. If the bottom of the blade thingy doesnt work we might just have to put in a seacock#!. We already previously bought two apollon 1-1/2" and 1" bronze valves but hopefully wont need them!
Hanging it off the self steer means we can still service
the transducer by raising the blade and by introducing a vent valve in engine intake, there is no possibility of siphoning back.