[PSUBS-MAILIST] Forward Facing Scanning Sonar

[Alan via Personal_Submersibles]

Thanks Vance & Keith,
There seems to be quite a range of products out there & the ones
that 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 seeing
contours & distances directly in front of you. I could enclose the transducer in a thick
shell 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 if
it 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, & there
is always the option of upgrading to a better scanner later on.
Alan



Sent from my iPad

> 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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