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Boat Speed & Sonar Image
#12491674
11/04/17 02:37 PM
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Joined: Mar 2010
Posts: 25,824
T Bird
OP
TFF Guru
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OP
TFF Guru
Joined: Mar 2010
Posts: 25,824 |
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.
Okie by birth, Texan by choice. USAF "Thunderbirds" Alumni 1985-1989
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Re: Boat Speed & Sonar Image
[Re: T Bird]
#12491707
11/04/17 03:00 PM
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Joined: Jan 2008
Posts: 19,795
Donald Harper
TFF Guru
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TFF Guru
Joined: Jan 2008
Posts: 19,795 |
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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Re: Boat Speed & Sonar Image
[Re: T Bird]
#12491741
11/04/17 03:37 PM
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Joined: Feb 2015
Posts: 4,724
Flippin-Out
TFF Team Angler
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TFF Team Angler
Joined: Feb 2015
Posts: 4,724 |
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.
Last edited by Flippin-Out; 11/04/17 03:48 PM.
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Re: Boat Speed & Sonar Image
[Re: T Bird]
#12491771
11/04/17 04:09 PM
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Joined: Nov 2010
Posts: 5,101
Wayne P.
TFF Celebrity
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TFF Celebrity
Joined: Nov 2010
Posts: 5,101 |
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.
Last edited by Wayne P.; 11/04/17 04:13 PM.
Helix 12 CHIRP MEGA SI+ GPS G3N and G4N, 1198c SI, SOLIX 10 SI G3, Helix 8 MEGA SI+ GPS G4N, SOLIX 12 SI and G3, MEGA 360, MEGA LIVE TL, RC-1
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Re: Boat Speed & Sonar Image
[Re: T Bird]
#12491786
11/04/17 04:32 PM
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Joined: Feb 2009
Posts: 1,436
Squirrely Dan
Extreme Angler
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Extreme Angler
Joined: Feb 2009
Posts: 1,436 |
I have same issue with mine. Once I hit 40 or so I lose depth. I dont think mine was installed right. Came with boat new.
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Re: Boat Speed & Sonar Image
[Re: T Bird]
#12492032
11/04/17 08:45 PM
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Joined: Dec 2008
Posts: 16,181
grout-scout
TFF Guru
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TFF Guru
Joined: Dec 2008
Posts: 16,181 |
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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Re: Boat Speed & Sonar Image
[Re: T Bird]
#12492085
11/04/17 09:48 PM
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Joined: Jun 2012
Posts: 1,390
Andrew Y'Barbo
Extreme Angler
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Extreme Angler
Joined: Jun 2012
Posts: 1,390 |
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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Re: Boat Speed & Sonar Image
[Re: T Bird]
#12492151
11/04/17 11:12 PM
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Joined: Nov 2008
Posts: 7,618
361V
TFF Celebrity
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TFF Celebrity
Joined: Nov 2008
Posts: 7,618 |
If you loose your depth @ speed your through hull transducer is glued into the wrong place.
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Re: Boat Speed & Sonar Image
[Re: 361V]
#12492163
11/04/17 11:22 PM
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Joined: Feb 2009
Posts: 1,436
Squirrely Dan
Extreme Angler
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Extreme Angler
Joined: Feb 2009
Posts: 1,436 |
Thats what I was told or the glue could be causing interference. I dont even know where the transducer is lol
Last edited by Im RICK JAMES; 11/04/17 11:47 PM.
Fully sponsored by my mom
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Re: Boat Speed & Sonar Image
[Re: T Bird]
#12492187
11/04/17 11:39 PM
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Joined: Jul 2009
Posts: 1,342
EastTexasBassin
Extreme Angler
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Extreme Angler
Joined: Jul 2009
Posts: 1,342 |
I completely lose my sonar at anything beyond idle. If I'm on plane it reads nothing.
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Re: Boat Speed & Sonar Image
[Re: EastTexasBassin]
#12492543
11/05/17 03:34 AM
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Joined: Apr 2014
Posts: 908
Jaguar6
Pro Angler
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Pro Angler
Joined: Apr 2014
Posts: 908 |
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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Re: Boat Speed & Sonar Image
[Re: Squirrely Dan]
#12492627
11/05/17 08:00 AM
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Joined: Feb 2015
Posts: 4,724
Flippin-Out
TFF Team Angler
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TFF Team Angler
Joined: Feb 2015
Posts: 4,724 |
Thats what I was told or the glue could be causing interference. I dont 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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Re: Boat Speed & Sonar Image
[Re: EastTexasBassin]
#12492742
11/05/17 01:30 PM
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Joined: Dec 2008
Posts: 16,181
grout-scout
TFF Guru
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TFF Guru
Joined: Dec 2008
Posts: 16,181 |
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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Re: Boat Speed & Sonar Image
[Re: T Bird]
#12492754
11/05/17 01:37 PM
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Joined: Dec 2008
Posts: 16,181
grout-scout
TFF Guru
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TFF Guru
Joined: Dec 2008
Posts: 16,181 |
Skeeter used to cut about an 1/4 deep spot for the shoot through the hull transducer puck to sit into. It wasnt 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, Im convinced nobody on here other than Flippin & me reads any of the responses.
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Re: Boat Speed & Sonar Image
[Re: EastTexasBassin]
#12492758
11/05/17 01:43 PM
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Joined: Nov 2006
Posts: 2,857
retdbasser
Extreme Angler
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Extreme Angler
Joined: Nov 2006
Posts: 2,857 |
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+.
Prepare for the future-it will be here tomorrow. Personal Best Large Mouth Bass 9 lbs. 12 oz 5/13/19. Herb Stein, who famously reminded us that “if something can’t go on forever, it will stop.”
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