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  #1  
Old 05-07-2017, 07:17 PM
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Default MEGA SI issue

I have a newly installed Helix 12 G2N SI and while I am absolutely amazed by the quality of the new SI imaging...I lose 2D depth when running faster than about 10 MPH.

Unit is installed on an '05 Crestliner CMV 1850. I can provide pictures of the install if that will help.

This is an upgrade from a Humminbird 1198, never had any issues like this with the older transducer.

Thanks in advance for any help!
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  #2  
Old 05-07-2017, 08:23 PM
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Old 05-07-2017, 08:52 PM
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I think due to the angle on the front of the transducer it creates turbulence at speed will probably need a high speed transducer or angle transducer down.
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  #4  
Old 05-08-2017, 06:42 AM
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Quote:
Originally Posted by Further North View Post
Pictures attached
Is that a new transducer mounting board or existing? Not sure I like the gap at the bottom of the mounting board and the bottom of the hull. Water cannot flow seamlessly across that gap, which is important for sonar to talk to the bottom.


I think overall it's slightly too low, and tilted down too far in the back. You want the water to come off the hull and wash the face of the transducer, not scrub it. High speed tds can be tilted. Imaging tds need to be mounted in a plane with the bottom of the hull, or slightly tipped up from that plane to account for the attitude of the boat at speed. Go out with a pocket full of change and a pocket level. Put the boat at4 mph and add coils under the back end of the level. Remember how many it takes for the level to be level. Then ramp up to full speed and redo the coins. Record the number. Take the boat back to the shop, crank the trailer jack up till you can replicate the coins and level. Then, level the transducer to that . At 4 mph this will be your best imaging angle. If full speed is different, then that angle is best for full speed. In your application, the left half of the transducer shouldn't be below the hull. Only from right side. That's a starting point..

Last edited by reddog; 05-08-2017 at 06:51 AM.
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  #5  
Old 05-08-2017, 06:57 AM
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I have a 10 Mega and I also had to install a high speed transducer, I was told that the one that comes with won't read at speeds above 10mph.
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Old 05-08-2017, 11:03 AM
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There are guys using the MSI XDCR North of 50 MPH, so bah on 10 MPH....

Use a straight edge to get horizontal front to back alignment with the hull bottom.

The tail can be dipped down a few degrees if needed, and like Rollie suggested it appears to be a bit low, bigger pics and closer up would help diagnose as would from some 90 degree right angles...
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Old 05-09-2017, 08:39 PM
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Quote:
Originally Posted by sfw1960 View Post
There are guys using the MSI XDCR North of 50 MPH, so bah on 10 MPH....
I have heard the same.

Quote:
Originally Posted by sfw1960 View Post
Use a straight edge to get horizontal front to back alignment with the hull bottom.
Did that, but then I fiddled with it...went with what "looked" right based on my old 1198 transducer. Shoulda known better.

Quote:
Originally Posted by sfw1960 View Post
The tail can be dipped down a few degrees if needed, and like Rollie suggested it appears to be a bit low, bigger pics and closer up would help diagnose as would from some 90 degree right angles...
I will work on better pictures later in the week, or on the weekend.
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Old 05-15-2017, 07:29 PM
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Got it working...in fact, it's working well enough that I'm getting SI images (lacking any useful detail, of course) up to about 33 MPH.


Changed the angle a bit (back end up a smidge) and moved the entire transducer up about 1/4" - 3/8".



A couple of pictures attached.
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Old 05-15-2017, 08:02 PM
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Nice job, I was hoping to see the actual XDCR install though.



It looks like your wiring might be a bit light with only 11 volts...
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Old 05-16-2017, 07:03 PM
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Quote:
Originally Posted by sfw1960 View Post
Nice job, I was hoping to see the actual XDCR install though.
My garage sucks for taking pictures.


Quote:
Originally Posted by sfw1960 View Post
It looks like your wiring might be a bit light with only 11 volts...
End of the day and the electronics are on a completely separate system that doesn't get charged from motor.

Used to show way more when I was running and they were hooked to the starting battery.

"Light" is the last thing I'd say about my wiring...I tend to...kinda...over do it...
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