Sandgrounder
Well-Known Member
Are there any echosounders which work without a transducer fitted through the hull? If so are they any good?
Echo Sounders and Through Hull Fitting
- Thread starter Sandgrounder
- Start date
Pete7
Well-Known Member
Yes, lots. Our Garmin has a transducer which fire through the hull. A plastic widget is glued to the inside the hull. the widget filled with oil then the transducer fitted. Oil and GRP transmit the signal very well. Most of the manufacturers use Airmar transducers who produce a good selection of different types.
The transom mounted sounder units can also be made to work inside a hull by gluing it in with epoxy or sealant.
The transom mounted sounder units can also be made to work inside a hull by gluing it in with epoxy or sealant.
Sandgrounder
Well-Known Member
Thanks
GrahamM376
Well-Known Member
Our transponder is epoxied to the inside of the hull, no need for an oil bath.
Seajet
...
If the transducer is mounted forward where the hull sections are likely to be veed, an oil bath with a scarfed bottom keeps the transducer vertical to give a realistic reading.
If mounted aft in the hull, a transom mount type transducer can be simply stuck to the inside of the hull as the sections there are pretty flat, or only a few degrees off horizontal which is catered for by the wide beam of the transmitted signal.
My boat has one of each of the above, as the transducers need to be seperate to avoid conflicting signals ( I fitted 2 complete systems as it cost the same as a repeater but allows redundancy for one system failing ).
If mounted aft in the hull, a transom mount type transducer can be simply stuck to the inside of the hull as the sections there are pretty flat, or only a few degrees off horizontal which is catered for by the wide beam of the transmitted signal.
My boat has one of each of the above, as the transducers need to be seperate to avoid conflicting signals ( I fitted 2 complete systems as it cost the same as a repeater but allows redundancy for one system failing ).
Daydream believer
Well-Known Member
To mount my transducer I purchased a 50mm Osma straight connector plus a male screwed end cap to fit inside the connector. ( Travis Perkins or any builders supplies)
I joined them with solvent weld cement. I drilled the end cap to suit the stem of the transducer. Threaded the wire through the hole before installing the wire, Not forgetting to have a nut both sides of the cap. ( mine being 12mm metric threaded)
Then I glassed in the plastic straight connector with west epoxy with a filler to stiffen up. Filled with oil & screwed the end cap in place with the nut on the transducer set so it went in at the correct depth. then tightened the second nut to hold it in place. I kept the fiting tight to a bulkhead so the wire can exit the fitting & run up the bulkhead so that gear slung in the locker does not dislocate the wire
I joined them with solvent weld cement. I drilled the end cap to suit the stem of the transducer. Threaded the wire through the hole before installing the wire, Not forgetting to have a nut both sides of the cap. ( mine being 12mm metric threaded)
Then I glassed in the plastic straight connector with west epoxy with a filler to stiffen up. Filled with oil & screwed the end cap in place with the nut on the transducer set so it went in at the correct depth. then tightened the second nut to hold it in place. I kept the fiting tight to a bulkhead so the wire can exit the fitting & run up the bulkhead so that gear slung in the locker does not dislocate the wire
Bodach na mara
Well-Known Member
My new fishfinder came with a transom-mount transducer. Solution:- find suitable bit of hull, apply large, bubble-free blob of silicon sealant, roll transducer onto blob. Seemples.
tudorsailor
Well-Known Member
My Raymarine depth sounder has packed in. The Raymarine agent has stuck a new one onto the hull - on the inside of the boat - as the annual lift out is 50 weeks away! Seems to work perfectly through the fibreglass. No oil seal. I suppose I will replace the broken one at the next lift out if I remember!
TS
TS
