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#12491674 - 11/04/17 09:37 AM Boat Speed & Sonar Image
T Bird Offline
TFF Celebrity

Registered: 03/07/10
Posts: 6245
Loc: Temple, TX.
For folks with shoot thru the hull transducers.

At what boat speed do you begin to lose bottom image?

Me... HDS 12 Gen 2 @ about 45MPH.

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#12491707 - 11/04/17 10:00 AM Re: Boat Speed & Sonar Image [Re: T Bird]
Donald Harper Online   happy
TFF Guru

Registered: 01/25/08
Posts: 15018
Loc: Justin, TX.
Don't understand why. The hull transducer is suppose to give the best reading at high speed as there is no turbulence and it is always in the water. All I can figure is the placement is wrong or you have a void under it in some way. Pour 5 gals. of water in the transom of the boat and see if that makes a difference while up and running.
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#12491741 - 11/04/17 10:37 AM Re: Boat Speed & Sonar Image [Re: T Bird]
Flippin-Out Offline
Extreme Angler

Registered: 02/25/15
Posts: 2167
Loc: Magnolia, TX
There is always turbulence; speed doesn't negate it. (Even a jet traveling at near Mach 1 has aerodynamic surface turbulence.)

You cannot avoid losing the bottom signal at some point as speed increases. One reason is because the boat moves after sending the string of ping signals to reflect off the lake bottom. When the signal packet gets back to the surface, the transducer isn't there; it has moved slightly. The faster the boat is going, and the deeper the water, the farther "out of position" the transducer is. When this happens, the transducer's new position isn't ideal. Signal amplitude falls off very rapidly as you move away from the transducer's position when the ping pulse was released. The data also becomes distorted because the angle to the transducer's new position distorts the data indicating what was on the lake bottom.


Edited by Flippin-Out (11/04/17 10:48 AM)

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#12491771 - 11/04/17 11:09 AM Re: Boat Speed & Sonar Image [Re: T Bird]
Wayne P. Offline
TFF Team Angler

Registered: 11/16/10
Posts: 4150
Loc: Charlottesville, Va
Originally Posted By: T Bird
For folks with shoot thru the hull transducers.

At what boat speed do you begin to lose bottom image?

Me... HDS 12 Gen 2 @ about 45MPH.


Is that the fastest you could get when testing BEFORE you attached the transducer to the hull?

The fiberglass bass boat I used to have had a max speed of 68.4 and I never lost the depth reading or bottom image.
The last boat I assisted with a shoot-thru installation got over 72 mph with no depth loss or bottom image.


Edited by Wayne P. (11/04/17 11:13 AM)
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#12491786 - 11/04/17 11:32 AM Re: Boat Speed & Sonar Image [Re: T Bird]
Im RICK JAMES Offline
Extreme Angler

Registered: 02/13/09
Posts: 1232
Loc: All over
I have same issue with mine. Once I hit 40 or so I lose depth. I don’t think mine was installed right. Came with boat new.
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#12492032 - 11/04/17 03:45 PM Re: Boat Speed & Sonar Image [Re: T Bird]
grout-scout Online   content
TFF Celebrity

Registered: 12/08/08
Posts: 7173
Loc: Boerne, Texas
My boat holds til 60mph, but I have a heavy deep V hull Champion. My Skeeter used to lose it about 55, caused by over trimming your boat. The hull gets so high that the sonar is trying to shoot through the air under the hull.

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#12492085 - 11/04/17 04:48 PM Re: Boat Speed & Sonar Image [Re: T Bird]
Andrew Y'Barbo Offline
Extreme Angler

Registered: 06/25/12
Posts: 1390
Loc: Lufkin Texas
At anything over 40mph it's useless. You have already passed it by 100s of feet. If you're worried about depth use your mapping. If you're looking for stuff running under 40mph is fine.

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#12492151 - 11/04/17 06:12 PM Re: Boat Speed & Sonar Image [Re: T Bird]
361V Offline
TFF Celebrity

Registered: 11/21/08
Posts: 5168
Loc: somervell county
If you loose your depth @ speed your through hull transducer is glued into the wrong place.
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#12492163 - 11/04/17 06:22 PM Re: Boat Speed & Sonar Image [Re: 361V]
Im RICK JAMES Offline
Extreme Angler

Registered: 02/13/09
Posts: 1232
Loc: All over
That’s what I was told or the glue could be causing interference. I don’t even know where the transducer is lol


Edited by Im RICK JAMES (11/04/17 06:47 PM)
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#12492187 - 11/04/17 06:39 PM Re: Boat Speed & Sonar Image [Re: T Bird]
EastTexasBassin Offline
Pro Angler

Registered: 07/15/09
Posts: 998
Loc: Lake Ray Hubbard
I completely lose my sonar at anything beyond idle. If I'm on plane it reads nothing.

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#12492543 - 11/04/17 10:34 PM Re: Boat Speed & Sonar Image [Re: EastTexasBassin]
Jaguar6 Offline
Pro Angler

Registered: 04/16/14
Posts: 776
Loc: Mesquite, TX
Originally Posted By: EastTexasBassin
I completely lose my sonar at anything beyond idle. If I'm on plane it reads nothing.
Unfortunately same here... I have my mapping to help on new lakes that I don't know but wish I had the sonar at least when on plane. Could use the depth reading every once in a while!
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#12492627 - 11/05/17 02:00 AM Re: Boat Speed & Sonar Image [Re: Im RICK JAMES]
Flippin-Out Offline
Extreme Angler

Registered: 02/25/15
Posts: 2167
Loc: Magnolia, TX
Originally Posted By: Im RICK JAMES
That’s what I was told or the glue could be causing interference. I don’t even know where the transducer is lol


So the glue might be causing interference at speeds above 40 but not below 40? Isn't the glue the same all the time? If so how could what you say make any sense?

What's likely happening is that hydrodynamic turbulence develops at speeds over 40, and that turbulence affects the hull area where your transducer is looking through the hull toward the lake bottom.

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#12492742 - 11/05/17 07:30 AM Re: Boat Speed & Sonar Image [Re: EastTexasBassin]
grout-scout Online   content
TFF Celebrity

Registered: 12/08/08
Posts: 7173
Loc: Boerne, Texas
Originally Posted By: EastTexasBassin
I completely lose my sonar at anything beyond idle. If I'm on plane it reads nothing.


Then yours is installed 100% wrong.

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#12492754 - 11/05/17 07:37 AM Re: Boat Speed & Sonar Image [Re: T Bird]
grout-scout Online   content
TFF Celebrity

Registered: 12/08/08
Posts: 7173
Loc: Boerne, Texas
Skeeter used to cut about an 1/4” deep spot for the “shoot through the hull” transducer puck to sit into. It wasn’t quite far enough back, so while trimming up a person introduced air under the hull. If you trim down all the way, you will regain the bottom contact on the graph. Now with that written, I’m convinced nobody on here other than Flippin’ & me reads any of the responses. hammer

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#12492758 - 11/05/17 07:43 AM Re: Boat Speed & Sonar Image [Re: EastTexasBassin]
retdbasser Offline
Extreme Angler

Registered: 11/29/06
Posts: 1820
Loc: Garland,TX
Originally Posted By: EastTexasBassin
I completely lose my sonar at anything beyond idle. If I'm on plane it reads nothing.


Same problem with manufacturer installed through hull. Bought new graph and transom mount transducer, works up to 10MPH now, on plane reads 200+.
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