<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div><span></span></div><div><meta http-equiv="content-type" content="text/html; charset=utf-8"><div><span></span></div><div><div>Thanks Vance & Keith,</div><div>There seems to be quite a range of products out there & the ones</div><div>that have images that look like something recognisable are very expensive.</div><div> The simrad forward scan is in my range but is 2d, so you are only seeing</div><div>contours & distances directly in front of you. I could enclose the transducer in a thick</div><div>shell of fiberglass with an area over the transmitting face that was only 3mm thick</div><div>& this would give me my depth rating, but it might be a waste of money if</div><div>it doesn't shoot through the 3mm well enough. Transducer costs $700 & </div><div>display costs $1000.</div><div> Could always put it on a boat if it can't shoot through the fibreglass, & there</div><div>is always the option of upgrading to a better scanner later on.</div><div>Alan</div><div><br></div><div><br></div><div><br><div>Sent from my iPad</div></div><div><br>On 25/02/2018, at 3:38 PM, via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br><br></div><blockquote type="cite"><div><font color="black" size="3" face="Arial, Helvetica, sans-serif">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.
<div>Vance<br>
<br>
<br>
<div style="font-family:helvetica,arial;font-size:10pt;color:black">-----Original Message-----<br>
From: Alan via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>
To: personal_submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>
Sent: Sat, Feb 24, 2018 8:19 pm<br>
Subject: [PSUBS-MAILIST] Forward Facing Scanning Sonar<br>
<br>
Just wondering whether a forward facing scanning sonar is worth it.<br>
I have been re-looking at them to see if there have been any recent<br>
developments.<br>
A couple that I have looked at that are for the rov market, are around<br>
10-15k. I looked at a video showing a camera image with the scanner<br>
screen image in the corner of the screen, & it looked unintelligible.<br>
Am wondering if just a depth sounder mounted horizontally would do<br>
just from the low visibility collision avoidance perspective. I could make a<br>
small fibreglass plug to fit in a small through hull & mount a "shoot through<br>
hull" depth sounder inside my hull. Did a quick analysis & a 2" diameter <br>
fibreglass plug 1/2" thick fitted over a 1" diameter hole would give me a <br>
15,000ft depth rating. Have talked with sonar people who have advised not <br>
to go more than 1/2" thick with the fibreglass I am shooting through & to <br>
leave no air gaps between the transducer & fibreglass. <br>
I did pursue the idea of adapting the cheaper Simrad Forward Scan for boats<br>
but after getting little information from manufacturers & reps, dropped the<br>
idea. They also said they didn't think it would work with a shoot through hull<br>
& had no idea of it's depth rating.<br>
Has anyone had any experience with forward scan or a forward mounted<br>
depth sounder. Or from your submarine experience do you think this is<br>
not really necessary.<br>
Cheers Alan<br>
<br>
<br>
Sent from my iPad<br>
<br>
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