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Skimmer vs Shoot-Thru Transducer

Old 09-11-2014, 08:53 AM
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Default Skimmer vs Shoot-Thru Transducer

Is it widely-accepted that one provides better signal than the other or is it largely personal preference? This will be for a 18' Pioneer center console boat. I like the idea of having the transducer concealed inside the boat but not if it will result in a noticeable performance loss.

EDIT: I found this on Lowrance's website:

<< Transom Mount
The transom-mount transducer is the most popular, and it's generally the easiest to install. The Skimmer® transducer design performs best when it is slightly below the boat's hull. Transom mounting is ideal for high-speed operation and models with the "kick-up" feature will prevent damage if the transducer strikes an object.

<< Shoot-Thru-Hull Mount
In this installation, the transducer is bonded to the inside of the hull with epoxy. Ideally, the transducer is placed in the aft third of the hull close to the centerline. The signal "shoots through" the hull with some loss of signal strength. This installation must be made in an area of the hull that is made from solid fiberglass, with no air bubbles or separated layers. If the hull is of multi-layer or "sandwich" construction, you will have to remove the inner layer of fiberglass and the wood or foam core to expose the outer layer of the hull. This type of mount is recommended only with 192 or 200 kHz transducers.


I'm wondering if this means an 83/200 transducer won't operate well in 83 mode?


Thanks !!
Old 09-11-2014, 09:32 AM
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Get a tilted element trough hole instead.

https://www.google.no/url?sa=t&sourc...W-zWguCmX-2NVA

I bought my first tilted element 7 years ago, since that I've added three more (I have two boats)

Excellent performance at any speed, no drag problems.
Old 09-11-2014, 11:51 AM
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Thanks for the suggestion. That probably offers the best performance but I'm not game for cutting a hole in the bottom of my hull.
Old 09-11-2014, 12:30 PM
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Originally Posted by Ric232 View Post
Thanks for the suggestion. That probably offers the best performance but I'm not game for cutting a hole in the bottom of my hull.
There are many thousands of boats with thru hull duers.....that is going to give the best sonar capabilty.

If you do choose to shoot thru the hull ..at least go to a P79 ..that is designed for the task.
Old 09-11-2014, 01:24 PM
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p79 yes
Old 09-11-2014, 01:57 PM
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Hmm . . . We must all think alike. Given a better, non-stock option, I'm probably avoiding stock. That said, is the P79 a good option for me since I will be inshore and near coastal (18' boat)? I was planning on a 83/200 transducer whereas the P79 seems to be available only in 50/200. I will almost never be in even 100' of water. (Maybe this means you guys are WAY out of my league !!)
Old 09-11-2014, 02:00 PM
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Just lower the one you have a bit. Change the angle a bit . It will work fine once you get the angle right.
Old 09-11-2014, 02:02 PM
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i would listen semperfifishing advice, he knows his stuff ....
Old 09-11-2014, 02:38 PM
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Originally Posted by 1NO REGRETS View Post
Just lower the one you have a bit. Change the angle a bit . It will work fine once you get the angle right.
I don't have one yet. Are you referring to the P79 or one of the "stock" Lowrance thru-hull transducers?
Old 09-11-2014, 02:45 PM
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At that depth you'll be fine with nearly anything.

Last edited by VanW; 09-11-2014 at 03:04 PM.
Old 09-11-2014, 03:36 PM
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Ok, so I've done some more research and I think I get it now. The benefits I will obtain from going to a P79 (in light of the small cost difference vs the stock transducer) will more than outweigh what I will lose by not having a 83kHz mode.

Is this a fair statement?
Old 09-11-2014, 03:40 PM
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Originally Posted by Ric232 View Post
I don't have one yet. Are you referring to the P79 or one of the "stock" Lowrance thru-hull transducers?
thought you were using the one still on the boats transom, sorry..........use the p79 mine works great.
Old 09-11-2014, 04:13 PM
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Originally Posted by Ric232 View Post
Ok, so I've done some more research and I think I get it now. The benefits I will obtain from going to a P79 (in light of the small cost difference vs the stock transducer) will more than outweigh what I will lose by not having a 83kHz mode.

Is this a fair statement?
The main benefit is that the P79 is designed for a shoot thru configuration and thus will give the higher quality results vs mounting a transom ducer to the inside of the hull.



Old 09-11-2014, 04:25 PM
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And that it will (more than likely) be easier to install where no air will cause bad readings. But if there is an air void in your hull layup you can have problems too, however the p79 is not very big so it will probably not be an issue if you test the position first.
Old 09-11-2014, 06:06 PM
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Your toughest task will be finding the best place in your hull to mount it. ie where there is solid glass and not behind and strakes or through hull fittings that may be on the outside. I installed a P79 in my boat & the performance was surprising. I miss not having water temp. but I've gotten over it. Reads very well at all speeds and depths in excess of 150' so far.
Old 09-11-2014, 06:55 PM
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One easy way to find a good install area is to use a small plastic bag of water and the P79 head...move to different locations so as to find a good mounting location as you monitor the sonar return.
Old 09-11-2014, 07:59 PM
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Originally Posted by semperfifishing View Post
The main benefit is that the P79 is designed for a shoot thru configuration and thus will give the higher quality results vs mounting a transom ducer to the inside of the hull.
What about vs a transom-mount ducer mounted where it was intended to go, to the outside of the hull?
Old 09-11-2014, 08:04 PM
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Originally Posted by Ric232 View Post
What about vs a transom-mount ducer mounted where it was intended to go, to the outside of the hull?
A thu hull can lose up to 30% due to the hull losses....and an improperly installed transom mount also has losses and issues.
But overall ..I personally prefer a transom P66 to a in hull P79 (Same element) ...all things being equal.
Old 09-12-2014, 12:49 PM
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FWIW, -This may not be the norm, but my experience with the Lowrance high-speed "Skimmer" T/m T/D has been excellent on my boat with T/IB's.
I've been very surprisingly impressed with it's performance for 15+ yrs.
Clear screen with nicely-detailed bottom returns and even occasional fish or bait balls showing at cruise of 20 25+kts.
Much better results with the Skimmer than with a B774V T/H T/D with high speed fairing block somewhat farther forward that loses returns or has increasing "noise" at speed. Judging from y past experiences on former boats and other's with basic T/M T/D's of the same vintage I've felt the Skimmer tends in general to perform much better at what I consider speed. Just an opinion though.

Your mileage may vary.

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