[PSUBS-MAILIST] Forward Facing Scanning Sonar

Sun Feb 25 14:12:05 EST 2018

 Alan,I would not dismiss the possible depth rating of the transducer.  I just installed a new sounder in Gamma with 1,000 foot range and the transducer seems like it could handle all of that.  I had the original  one to almost 500 feet so far, so stay tuned and I will see how far we can push these things.Hank    On Sunday, February 25, 2018, 11:33:47 AM MST, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  

 Brian,thanks, that sounds promising. I could temporarily glue a sheet of fibreglass on to the transmittingface of the transducer & try it out on a boat first.Alan

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On 25/02/2018, at 7:21 PM, Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

Alan,               I have a depth sounder on my sailboat.  It's a low end Garmin, I made the decision to mount the transducer on the inside of the fiberglass hull, the fiberglass is quite thick in that area.  My boat is an Islander built in the mid 70's so they went overboard with the thickness of the fiberglass back then.  I get a very good image,  it even penetrates the mud !  I can tell because I checked the calibration at the dock and it was very accurate .   Brian 

--- personal_submersibles at psubs.org wrote:

From: Alan via Personal_Submersibles <personal_submersibles at psubs.org>
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
Subject: Re: [PSUBS-MAILIST] Forward Facing Scanning Sonar
Date: Sun, 25 Feb 2018 17:22:07 +1300

Thanks Vance & Keith,There seems to be quite a range of products out there & the onesthat have images that look like something recognisable are very expensive.   The simrad forward scan is in my range but is 2d, so you are only seeingcontours & distances directly in front of you. I could enclose the transducer in a thickshell of fiberglass with an area over the transmitting face that was only 3mm thick& this would give me my depth rating, but it might be a waste of money ifit doesn't shoot through the 3mm well enough. Transducer costs $700 & display costs $1000.   Could always put it on a boat if it can't shoot through the fibreglass, & thereis always the option of upgrading to a better scanner later on.Alan

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On 25/02/2018, at 3:38 PM, via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

Scanning sonar is the set of eyes you don't have. It's invaluable for anything beyond just dawdling around having a look in the light pool. Unfortunately, 10-15k won't touch what Pisces carries. The acoustic altimeter alone is getting on for 5k. Ouch.Vance

-----Original Message-----
From: Alan via Personal_Submersibles <personal_submersibles at psubs.org>
To: personal_submersibles <personal_submersibles at psubs.org>
Sent: Sat, Feb 24, 2018 8:19 pm
Subject: [PSUBS-MAILIST] Forward Facing Scanning Sonar

Just wondering whether a forward facing scanning sonar is worth it.
I have been re-looking at them to see if there have been any recent
developments.
A couple that I have looked at that are for the rov market, are around
10-15k. I looked at a video showing a camera image with the scanner
screen image in the corner of the screen, & it looked unintelligible.
Am wondering if just a depth sounder mounted horizontally would do
just from the low visibility collision avoidance perspective. I could make a
small fibreglass plug to fit in a small through hull & mount a "shoot through
hull" depth sounder inside my hull. Did a quick analysis & a 2" diameter 
fibreglass plug 1/2" thick fitted over a 1" diameter hole would give me a 
15,000ft depth rating. Have talked with sonar people who have advised not 
to go more than 1/2" thick with the fibreglass I am shooting through & to 
leave no air gaps between the transducer & fibreglass. 
I did pursue the idea of adapting the cheaper Simrad Forward Scan for boats
but after getting little information from manufacturers & reps, dropped the
idea. They also said they didn't think it would work with a shoot through hull
& had no idea of it's depth rating.
Has anyone had any experience with forward scan or a forward mounted
depth sounder. Or from your submarine experience do you think this is
not really necessary.
Cheers Alan

Sent from my iPad

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