I can see now - TM275LHW install 19HT

[miruhai]

This is a little embarrassing to admit, since tuna fishing is a high stakes type game given the costs and rewards involved, but for the past 3-4 seasons, I've been running blind and can only mark fish when going less than 5mph (lowrance totalscan). Finally picked up the TM275LHW last October in the middle of the BFT season in N. CA and there was a small chance of it being installed before the season ended. Work and BFT got in the way and finally was able to get it installed this past week -- just as the BFT started showing up.

The hoof has just enough room to fit when all the other moving parts do their thing. A motor upgrade might be an issue, but I'll deal with that in 5-10 years.

I haven't tested it OTW yet so the 4200 hasn't been used. I'll give it a try this weekend and hopefully will be able to mark fish while going madmac speed so that I can sit on them. 

[miruhai]

Posted in the wrong forum - please move this to Electronics

[christianbrat]

you can get some insane rockfishing spots now too.. you'll know everything down there

[agoodhi]

great, now there will be even less BFT for this weekend warrior to catch   

[headduck]

Sure is a nice swim step. Amazing how big those are.

[miruhai]

you can get some insane rockfishing spots now too.. you'll know everything down there

Good to know. Been RF since salmon is closed and found a productive area. It would be nice to mark more areas when moving around.

great, now there will be even less BFT for this weekend warrior to catch   

Fellow weekend warrior here - just have plenty of PTO. I usually catch the small ones so the bigger models are all yours! 

[Kimbrey]

I have the same unit except it's a thru-hull.  I do have issues as I gain speed and or rpm so the transducer location is poor.  IE it's mounted alongside an engine stringer and directly under the alternator so I get an electronic noise and possibly a harmonic from the Volvo.  Anyway it's great for me at tuna troll speed with the wide beam angle.  It does well marking in high frequency as deep as I want to look.  700' to 800'.  Hardly use the low side anymore.  I was told by a Furuno USA tech that I know to turn the gain up until it's dirty, then turn it up some more.  After that try to clean things up with the clutter control.  It works but I do drop the gain down a lot when at cruise speed.

[Capt Bones]

I haven't tested it OTW yet so the 4200 hasn't been used. I'll give it a try this weekend and hopefully will be able to mark fish while going madmac speed so that I can sit on them. 

Howdy Jack,

I know this is an older thread but I'd be interested in learning a few things from you. I just bought the same transducer (with the Furuno 10 pin connection). Obviously, this thing is big & heavy. Probably 4 lbs. I'm wondering how you attached the mounting plate. Did you use only the screws? Or did you do any through-bolting?

Also wondering how it performs, did you have to adjust the height any from that which is recommended in the installation manual?

Thanks much,  Mark

[miruhai]

I haven't tested it OTW yet so the 4200 hasn't been used. I'll give it a try this weekend and hopefully will be able to mark fish while going madmac speed so that I can sit on them. 

Howdy Jack,

I know this is an older thread but I'd be interested in learning a few things from you. I just bought the same transducer (with the Furuno 10 pin connection). Obviously, this thing is big & heavy. Probably 4 lbs. I'm wondering how you attached the mounting plate. Did you use only the screws? Or did you do any through-bolting?

Also wondering how it performs, did you have to adjust the height any from that which is recommended in the installation manual?

Thanks much,  Mark

I used the provided screws and countersink bit (or reverse drill the bit first instead of buying a bit).

The install was aggressive so it sits rather low to try to get a better reading. I'd set up the 2 vertical holes so that they give you the most flexibility to move down until you find a position that you like. Once you're okay with the install, add the goop and 5th screw. I made about 3 adjustments and finally just moved it as low as I could. This was a vid I saw a few years ago that I used as reference for the install:

https://www.youtube.com/watch?v=9i15P5TV4tw

Being able to locate bluefin when slow trolling can be done with any transducer. I was hoping to locate them while either running or fast trolling. So far, the results are decent - I guess I was expecting more or better readings. Here are some images of bluefin being marked while going 11-13 mph. The marking isn't as clean as what you would see if slow trolling and you have to make assumptions that they're the right type, but at least it gives you an idea that you should target that area.

[GregE]

OK,  I have the same TM style Transducer- rated 500W if memory serves.  Mount looks different though. 
I don't ID fish at higher troll speed and cruise.  I've fiddled with settings but I know the system should work better.

Anybody know someone in the Olympia area I can tap for some tuning help?

BTW top pictures look like the trim tab will touch the 'ducer pin.


SL22 holes:  washdown, drain, bait tank pick up,  deck drain with flap, engine well

[Yachter Yat]

  miruhai:  What?.....Another "pasta plastered" transom? Sorry. Maybe it's just me, but I see the potential for signal interference from the turbulence created by that trim tab. Why not make it simple, and just glue that ducer to the inside of the hull with LifeSeal?   I don't get it. Guess I'll never understand it.

Yat 

[christianbrat]

Yat, temp is extremely important for fishing... Especially Tuna!!!  plus im not sure a shoot-through would have a chance at picking up fish at 13mph.. Those tabs will not cause issues. my engine at full lock is .25" from my ducer, and my tab is .25" away on the other side. 0 issues great readings

[ak-angler]

... Why not make it simple, and just glue that ducer to the inside of the hull with LifeSeal?   I don't get it. Guess I'll never understand it.

I ran two transom mount 'ducers mounted shoot-through-hull style on my Arima. They were inexpensive low powered units and the system worked pretty well.

However... There's no way I'd run a very expensive high-powered (read ... runs hot) 'ducer any other way than it was designed. That is, the TM275LHW NEEDS to be transom mounted. Run it out of the water and it will burn up rather quickly.

No, thanks.

[Yachter Yat]

  I'll respond to both CB and AK:

  CB:  I'm not sure what your experience has been, but my in-hull mounted transducers had no problem measuring water temperature. Maybe my opinion, but that thin hull is probably as close to the water temperature as you would need to know.

  AK:  As far as overheating a transducer is concerned; I never experienced a problem with that either......at least here in the North Atlantic. I suppose it may be a concern in some of the warmer climes. Just as an example:  My sister-in-law's stepson has a winter place in South Florida. The water down there can oftentimes hit 90 degrees....especially in the summer.  So, would that be a problem? I don't really know, but I suppose taking a short ride 3 towns over, to the Airmar headquarters, would get me the answer.
  I can tell you this:  Even on the hottest days off our Coast, reaching down and touching the inside of my hull will cool you down.       

Yat

[miruhai]

Bluefin tuna fishing is a high stakes game - both in terms of money and time invested. Placing the TM275 inside the hull to  make it a trailer queen? I'm not about to make my boat famous and become the guy that did that. 

A decent option is to swap it out for the B175w, but I'd rather not drill a hole through the hull.

[Yachter Yat]

Bluefin tuna fishing is a high stakes game - both in terms of money and time invested.

  miruhai:  C'mon, loosen-up, it's only money.  That said, I learned long ago, we should never develop a taste for "champagne" on a "beer wallet". Ha    BTW, maybe it's just me, but if I were chasing tuna, I wouldn't be in favor of transducers sticking out behind the transom like that.  With my luck, it's likely, the first "irate mackerel" hooked would find a way to send it into orbit. Also wanted to say:  You shouldn't have to drill and install a thru-hull transducer. I've done 4 "shoot thru-hull" installs on my boats and never had a problem relating to any of the issues mentioned in our discussion.

Yat

[christianbrat]

CB:  I'm not sure what your experience has been, but my in-hull mounted transducers had no problem measuring water temperature. Maybe my opinion, but that thin hull is probably as close to the water temperature as you would need to know.
Yat

its well known a shoot through ducer does not read temps accurately. there's no argument that's just how it works; the transducer is surrounded by air in a closed compartment reading that temp, not the temp of the water thats is on the other side of air and .25in of fiberglass. most shoot through manuals state this, and recommend a separate temp sensor to be mounted extrenally below the waterline.

unfortunately your opinion and the opinion of the fish we target vary greatly

[Yachter Yat]

  CB:  Sorry, but I must respectfully disagree.  I don't honestly believe you would see a difference in water temp of perhaps more than one or two degrees between a transducer mounted on the transom vs. one glued to the bilge; especially if it were glued with a 'thin' layer of adhesive, such as mine was. To verify this, you might consider taping a thermometer at the bottom center of your bilge and compare that to whatever you're seeing on your electronic device. 

  BTW, this was the last transducer I installed on my Arima when swapping the Loran for the new Raynav GPS/FF.  I glued it with a thin layer of LifeSeal. That thing worked perfectly. Great resolution and never failed to lock-on (and stay locked-on) at any speed. I had it glued somewhere around a foot behind the bilge pump. And yes, it gave me temp, which (by way of being close to touching the bottom of the hull), I couldn't imagine being much more than a degree or so from actual water temp.
 
   See here: https://www.nauticexpo.com/prod/airmar/product-22646-104521.html 

   Just so you understand; most of our angling wasn't in much deeper water than 300 feet or so....usually less. It's not that I couldn't afford a more powerful transducer, I simply couldn't see the benefit, or justify the expense. YMMV, of course. BTW, I also have to disagree with you about fish necessarily having an "opinion"......they just want to swallow whatever the hell looks appetizing.  

Yat
 

[christianbrat]

1 or 2 degrees is a MASSIVE change. you dont have to believe anything i say

[Yachter Yat]

  All you want to know is the water temp.....right?  Okay. Then maybe you could give some consideration to what I suggested about taping a thermometer in your bilge. If, for example, your machine reads 55, and the bilge thermometer reads 56, then you can believe whichever you want.

Yat 

[Capt Bones]

I haven't tested it OTW yet so the 4200 hasn't been used. I'll give it a try this weekend and hopefully will be able to mark fish while going madmac speed so that I can sit on them. 

Howdy Jack,

I know this is an older thread but I'd be interested in learning a few things from you. I just bought the same transducer (with the Furuno 10 pin connection). Obviously, this thing is big & heavy. Probably 4 lbs. I'm wondering how you attached the mounting plate. Did you use only the screws? Or did you do any through-bolting?

Also wondering how it performs, did you have to adjust the height any from that which is recommended in the installation manual?

Thanks much,  Mark

I used the provided screws and countersink bit (or reverse drill the bit first instead of buying a bit).

The install was aggressive so it sits rather low to try to get a better reading. I'd set up the 2 vertical holes so that they give you the most flexibility to move down until you find a position that you like. Once you're okay with the install, add the goop and 5th screw. I made about 3 adjustments and finally just moved it as low as I could. This was a vid I saw a few years ago that I used as reference for the install:

https://www.youtube.com/watch?v=9i15P5TV4tw

Being able to locate bluefin when slow trolling can be done with any transducer. I was hoping to locate them while either running or fast trolling. So far, the results are decent - I guess I was expecting more or better readings. Here are some images of bluefin being marked while going 11-13 mph. The marking isn't as clean as what you would see if slow trolling and you have to make assumptions that they're the right type, but at least it gives you an idea that you should target that area.

Thank you for this Hai, I really appreciate it. I may have additional questions for you.

Mark