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Author Topic:   SONAR Transducer: Transom Mount: Location
1985supersport15 posted 05-05-2008 09:23 PM ET (US)   Profile for 1985supersport15   Send Email to 1985supersport15  
[What is] the best place to mount a Humminbird transom-mount transducer on 1985 [Boston Whaler] SUPER SPORT [15]? Has anyone mounted [a SONAR transducer] on the center pane of the transom with the motor which has wood beneath the fiberglass?

If so was the distance from the motor adequate to prevent turbulence and excessive interference? The bottom corners of this pane are about 12-inches from the center line so I figured it would be OK, but I may have to cheat in a little to avoid strakes which are in line with the corners of this pane port and starboard.

How far must the tranducer be from strakes to ensure minimum interferance?

Port or starboard mounting? Humminbird says with a clockwise prop in forward starboad is best because prop torque is downward on the starboad side. Continuous wave says port.

Trying to avoid going outside the wood reinforced center pane.

Any suggestions greatly appreciated.

zotcha posted 05-06-2008 10:02 AM ET (US)     Profile for zotcha  Send Email to zotcha     
I've been fighting with this myself, four years actually. My 1982 15 had no previous holes in the transom. Researched the site hard and basically came up with little information, other than follow manufacturers instructions. So 3 days ago I mounted it and am hoping to river test it today. I'll let you know.

I mounted it starboard, right at the corner of the raised pane that you speak of. Appears to be about 2 inches closer to the centerline (keel) than the forward strake, and clear of the causing turbulence prior to the prop. Hope to let you know this afternoon. Have a good day. zot.

1985supersport15 posted 05-06-2008 10:18 PM ET (US)     Profile for 1985supersport15  Send Email to 1985supersport15     
Thanks for the reply. Let me know how that works out as far as readings at higher speeds etc with that distance from that starboard strake. Also did you mount right to the fiberglass? I've heard some use King Starboard so they can adjust the mount location later to perfect it and it gives some added suppord so the fiberglass doesnt chip. Thanks, AC
zotcha posted 05-06-2008 10:41 PM ET (US)     Profile for zotcha  Send Email to zotcha     
Did ALL the research and decided to got through gelcoat/glass. Doesn't seem to be a problem. Winds today, however, were. Trying to get out tomorrow. Have the digital camera but may have lost the ability to download/email. Will work on it. zotcha.
jimh posted 05-06-2008 11:15 PM ET (US)     Profile for jimh  Send Email to jimh tiedowns384x300.jpeg
1985supersport15 posted 05-08-2008 02:25 PM ET (US)     Profile for 1985supersport15  Send Email to 1985supersport15     

On my 85 super sport 15 there is a strake up stream of that location in the picture. Can I cheat in and if so how far away from strake do i need to be. also not sure if that would be too close to prop as ive heard you want to be several inches outside prop radius

zotcha posted 05-08-2008 03:30 PM ET (US)     Profile for zotcha  Send Email to zotcha     
1985, looks like I got lucky. Ran it up to 4100 revs and was still reading bottom. I was pretty shocked. Did discover a small roostertail but I believe that if I was to raise it an eighth of an inch I would begin to lose bottom sooner.

As far as being located too close to the prop, I'm not sure yet. My A/V plate is almost two inches above the keel so the prop is much closer in elevation to the transducer. She did seem to be blowing out sooner but I had less than ideal conditions for comparison. Hopefully the transducer will prove to have no effect at all on engine performance.

I'd say set it right at that starboard corner of the raised pane. That will put between one and two inches inside the forward strake. Seems to have worked well for me. Hope this helps. zotcha.

1985supersport15 posted 06-18-2008 10:27 PM ET (US)     Profile for 1985supersport15  Send Email to 1985supersport15     
[Announced that he had a question but did not give the question.]

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