Transom mount transducer

They go in the water. You'll find they come with comprehensive fitting instructions as positioning and adjustment is critical. Properly installed they work just fine.

Phil
 
No instructions with the one i have . In the water doesnt sound good , holes under water !!!
Would fixing it to something fixed above the water line and then dropping it in the water work ?
I can see this going on the end of a broom handle /forums/images/graemlins/grin.gif
 
You really need to fix the transducer to something which will 'kick-up' for when you ground or if something should slide under the boat. You also need to position the head away from any stream of turbulence, such as directly behind a keel or propellor.
Broom handle sounds about right.
 
After my boat was struck by lightning and all the electronics fried I bought a fishfinder as a temporary 'get me home' depth sounder. I attached the transom mount transducer to a broom handle and strapped it to the rail at the aft quarter. It functioned perfectly for the month or so I needed it.
 
Call me fussy but i dont really want a broom handle strapped to the back of my boat /forums/images/graemlins/blush.gif
There must be an over priced marine broom handle flippy up transducer fixing plate i can buy ?
 
Some people do mount it on an extension to avoid drilling holes in the transom underwater but the use of shallow drilled holes and marine sealant should be quite ok. The transducer should be mounted as near to the centre of the boat as possible but positioned so that is not in the path of the prop or in the path of items on the hull that may cause the water to become turbulent. The transducer base should extend 3 mm below the base of the hull and aligned to be parallel with the water. Don't cut the cable if too long. Just coil it.

Phil
 
If I've missed something here, I apologise. But, why not just fit it inside the boat, on the bottom of the hull and shooting through it.
It just needs to be glued down to stop it moving, once you've found a satisfactory place for it.
I know lots of people who have this set-up.
 
Yes, that would be fine. Mine's a Garmin which is on a bracket that allows it to flip up up if an object is struck. The boat has a central outdrive and the transducer is mounted 14 inches to the right of the centreline of the boat. Works perfectly at all speeds up to its max of 27knts.

Phil
 
I reckon....

Prepare for some whopping assumptions here...

All I know of your vessel is that you spend most of the time on the Thames, from your old icon and I think you are a regular on the Thames forum.

Assuming I am correct, then I would have thought that a txr on the transom would be telling you that you have gone aground after the event. I know they have a cone, but surely, much of the time you would be in the shallows and submerged cars, a more forward looking sonar might be better. Or as you are not on a speed boat (assumption 2) could you fit the txr to the stem and run the cable up and in through the foredeck?

Also.. Is a sounder a good idea in the shallows like this.. You might end up watching it like a hawk and missing an obvious spit on the river that you otherwise would have avoided. This is how I neaped us on one cruise in Fishguard harbour, I was trusting the sounder and not the quite visible edge of the gutter that my crew was shouting from the foredeck was approaching fast.

Sorry if I am babbling, just thinking out loud on stuff I know little about..
 
Your assumptions are correct . It's very rare for me to run aground as Cuchilo has a very shallow draught . I can sneak in to most places as can my mate who i fish with for a wager of beer for the evening . I intend to cheat and use the fish finder to win and have free beer to go with the evening barbie /forums/images/graemlins/grin.gif
He will of course go mad when he finds out i have been cheating but that just makes it better !
 
Look....errr..........no one sems to have stated the obvious but if you have a glass boat, i.e. grp which I believe a Headline is, get hold of about 6 inches (150mm) of 1 1/2" Osma or similar plastic waste pipe and some Plastic Padding or P38 car body filler. Find a place under the cockpit floor or inside a locker, clean the GRP inside hull surface over an area about 100mm diameter with a bit of thinner and sandpaper and and bed the end of your tube in a good fillet of filler around the outside. When it goes hard, pour in a couple of tablespoons of veggie oil and push the transducer right down in it. Stuff the top with a bit of foam, an old sponge or something, 'cos unless you turn the boat upside down there's no way the oil can ever run out, and hook up. This is the approved method for Seafarer, NASA and so on in-hull fitting of transducers in a GRP hull. The oil allows a contact through the GRP to the water below. Adjust the readings in your head to allow for the distance the transducer is below water level to get true depth, although, as you have a flat bottomed boat, the reading will pretty much be depth under the hull which is what you really need. I've done this on several GRP boats, including the one I have now, the Ocean 30'.
 
I had a garmin transom transducer for a FF80 glued into my 10mm thick fibreglass hull for about 10 years - I made a dam with silicone sealant, then a lake of epoxy behind it, floated the transducer in the epoxy and when it set it was nice and level. This worked up to at least 180 feet depth.

With the new fishfinder GPSMAP450S, I bought an 'adjustable deadrise' through hull Airmar transducer which has an integral tube which is attached to the hull and which is filled with glycol antifreeze as recommended in the instructions.

So thats another liquid that can be used as well as oil.
 
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