Installing a new transom mount transducer????

[seaswirl]

I just bought a new Garmin echomap 73SV with the bluechart chip, the transducer on this is long, my boat already has a transducer mounted on it which I plan to keep on it, I don't like drilling any new holes into the hull, should I remove the transducer and mount a block then put the transducers on the block?? how should I mount the block?? will 5200 hold it if I were to use just that?? any tips would be appreciated, I just don't like drilling new holes in the boat, especially under the waterline.

[gtightline]

I'm no expert, but I would think that mounting it on a block could create turbulence while under power that might effect your readings. Just my 2 cents.

[985crabs]

I'm no expert either.

I share your aversion to drilling holes in the boat above or below the waterline, but at some point you have to realize that it's no longer a virgin and you have to make it yours however that may be. I put a second transducer right next the to other and it's never been a problem.

If you want to get a piece of Starboard and mount it to the transom using the original transducer holes then mount both to it, you should be fine. The important thing to do is to ensure a smooth flow of water across each transducer while on plane. That's a little tricky because the transom slopes in 2 directions, but you can figure it out using a yardstick to simulate the continuation of the hull line beyond the transom and make sure they touch it flatly. The transducer mounts generally hook down a bit so that the bottom of the transducer is well below the actual connection point to the hull. You could probably position your Starboard high enough on the transom so it wouldn't even be wet while on plane. If you really wanted to get fancy, you could use a router on the edges to round them so they'd create less turbulence.

Good luck.

[gnrphil]

I used one of these www.sternsaver.com/ fill your holes with some marine tex and put one of these on. Haven't had a problem with readings at speed.

[985crabs]

That's what I'm talking about!

[yolo]

I use 5200. Have two ducers and had to reinstall one after a board knocked it off. I drilled new holes because i couldn't get the other screws out. Which means 5200 did its job.

If you drill new holes make sure you put masking tape around ....actually first..... make sure you use the bit in the directions and put masking tape around the bit at whatever length the install directions say so you dont go too far.

I put a little 5200 in the hole before; just a little. Then I dip the screw into the 5200, turn it so it gets a decent amount & around all the threads; and screw it.

Two little "mess reduction tips" If you fill the hole totally and dip the screw then it gets a little messy (which really doesn't matter because you wont see it unless your a trailer guy). When you dip the screw you dont have to dip all the way down to the head, yea can leave a little lead so you dont get all over your fingers, the lead can be the thinkness of the ducer mount that the screw is going to pass through.

Hope this helps

[yolo]

Just re read your post and realized you asked a question about using 5200 as glue. thats not a good idea.

[yolo]

And one more thing I forgot to say.

If you put them next to each other make sure they are not the same frequencies.

Garmin used to put instructions for two ducers and how far apart they needed to be. But I put my buddies on last August and I dont remember seeing that now that I think about it.

[seaswirl]

thanks everyone, I will be mounting it to a piece of starboard, after I mount that to the boat. thanks again for all the info

[mosquito13]

I too am against drilling holes below the water line. No pics but I bevel cut one edge on a piece of starboard and 5200 nd it on the transome where I wanted to mount the sounder. There are kits for the tool incompetent(where I got the idea). Just make sure your screws are not longer then the starboard is thick.  Guese I should read through all the posts before putting my two cents in and covering stuff that has already been said. Just want to add a 1/2 " angle cut on bottom lip of starboard to avoid making and "dirty" water in front of the transducer.