[PSUBS-MAILIST] Fw: DOSITS: Forward Looking Sonar

Wed May 27 17:06:05 EDT 2015

Hi Cliff,
For my Pilot Fish project I ordered a cheap Airmar P79 sensor also with
NMEA 183 comms to use as a depth sounder, but I am struggling to find info
on the pinout: which cable color is which... did you find info on this?

regards
Antoine

On Fri, May 15, 2015 at 3:53 PM, Cliff Redus via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Alan, I am not sure packaging a fish finder sounder transducer in a 1-atm
> pod is necessary for 500ft.  My guess is most of these are fully potted and
> cab take the pressure.
>
> BTW, I am implementing a Airmar DST800 DST800 —Thru-Hull, Smart™ Sensor -
> Airmar Marine Transducers
> <http://www.airmartechnology.com/2009/products/marine-product.asp?prodid=73%C2%A0as> part
> of my R300 upgrade.  This sensor will give me altitude, speed and water
> temp.  The sensor sends out a NMEA 0183 ASCII sentence string that I will
> connect via RS232 serial feed into a coprocessor on my PLC.  I then can
> parse the string to get data.  I am using the same coprocessor so parse
> another transducer that gives me roll, pitch and heading.  This transducer
> is packaged in a custom 1-atm anodized aluminum housing.
>
> I looked at ROV sounders but these are expensive at $1500-$4000 each where
> these fish finder sounders are cheap.
>
> Cliff
>
>
>
> Cliff Redus
> Redus Engineering
> USA mobile:  830-931-1280
> cliffordredus at sbcglobal.com
>
>   ------------------------------
>  *From:* Alan James via Personal_Submersibles <
> personal_submersibles at psubs.org>
> *To:* Personal Submersibles General Discussion <
> personal_submersibles at psubs.org>
> *Sent:* Friday, May 15, 2015 4:41 AM
>
> *Subject:* Re: [PSUBS-MAILIST] Fw: DOSITS: Forward Looking Sonar
>
> Have just come back from the local boat show after talking to a couple of
> exhibitors about sonar / depth sounders.
> I am still finding my way here. Was told I could mount a forward looking
> sonar inside
> a fiberglass hull & would loose about 15% of my range as apposed to in
> water mounting.
> They said the depth sounder worked better than the forward looking sonar
> through fiberglass.
> Why not have a small view port type arrangement in the bottom or up front
> of the submarine
> with a fiberglass plate in it. Then glue the transducer to that.
> For a 3" diameter fiberglass plate .55" thick, I get a 4000ft crush depth.
> Safety factor of 4 for
> plastics I think, so 500ft capable operating depth.
> Quote from installation pdfs below......
> As an alternative to transom mounting, it is possible on many
> fiberglass-hulled boats to glue the transducer on the inside of
> the boat hull. Since fiberglass has similar sonar
> characteristics as water, the sonar signal can pass through
> the boat hull with minimal loss. The hull of the boat must be
> single layer construction (not double-hulled) Also, any air
> trapped in the lamination of the fiberglass would prevent the
> sonar signal from passing through.
> Inside the hull installations require no holes be drilled into the
> boat and through experimentation, high-speed operation
> comparable to transom mounting can be achieved. Two-part
> slow cure epoxy (not included) is required to glue the transducer in place.
> ......*In-hull:* Installed against the inside of the hull bottom, the
> in-hull transducer sends its signal through the hull. “Shoot through hull”
> transducers do not need direct water contact. They’re glued to the inside
> of the hull with silicone or epoxy. An in-hull transducer is a good choice
> for a trailered boat, a vessel with a stepped hull, and for other types of
> high performance hull designs, as there is no drag, hull penetration or
> potential for fouling. No integrated temperature sensor. Can be installed
> while boat is in the water. For deadrise angles up to 30 degrees. As with
> thru-hulls, the selected location should be aft and close to the centerline
> so that the transducer is in the water at all times.
> In-hull transducers need solid fiberglass at the mounting location; no
> foam or plywood coring material, or air pockets. A typical 600W transducer
> can transmit through 1/2" to 5/8" (12-16mm) of fiberglass. To install
> inside a cored hull, find a location with no coring or remove the core
> material.
> Alan
>
>
>
>  ------------------------------
>  *From:* Alan via Personal_Submersibles <personal_submersibles at psubs.org>
> *To:* Personal Submersibles General Discussion <
> personal_submersibles at psubs.org>
> *Sent:* Monday, May 11, 2015 5:10 AM
> *Subject:* Re: [PSUBS-MAILIST] Fw: DOSITS: Forward Looking Sonar
>
> Looks really nice Hank, but couldn't find a price.
> They are marketing to ship owners not recreational boat market.
> Had looked at other 3d forward scanners & they are quite a bit more than
> the Sinrad 2d.
> Alan
>
> Sent from my iPad
>
> > On 11/05/2015, at 12:26 am, hank pronk via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
> >
> >
> > Alan,
> > Check this system out, you probably have seen it.  This would be very
> nice to have.
> > Hank
> >> --- On Sun, 5/10/15, hank pronk <hankpronk at live.ca> wrote:
> >>
> >> From: hank pronk <hankpronk at live.ca>
> >> Subject: DOSITS: Forward Looking Sonar
> >> To: "hanker_20032000 at yahoo.ca" <hanker_20032000 at yahoo.ca>
> >> Received: Sunday, May 10, 2015, 8:25 AM
> >>
> >>
> >>
> >>
> http://www.dosits.org/technology/locatingobjectsusingsonar/forwardlookingsonar/
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>
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