[Public-List] Public-List Digest, Vol 1422, Issue 1

[The Rochets]

I installed mine in the starboard locker under the settee, main  
cabin, about a foot and a half aft of the bulkhead between the  
hanging locker and the main cabin, and about 7" into the locker. I  
chose this location as a compromise, keeping in mind the  
manufacturer' s recommendations.

For a full-keel sailboat, the recommended location for an in-hull  
transducer is just ahead of the keel, slightly to one side;  
unfortunately that's not possible on an A30 because the hull just  
ahead of the keel is too thick on the centre line, and off to the  
side as well as on  the centre line, the deadrise angle of the hull  
is too steep (here you run into the second requirement-- that the  
deadrise angle should not exceed 22°).
So you want it further aft (where the fiberglass is not as thick) and  
as close to the centre line as possible so that you find a mounting  
surface fairly close to the horizontal; at the same time, you don't  
want it so close to the keel that its beam could be blocked by the  
keel. That doesn't leave you much choice, and judging from the other  
responses, in-hull transducers in A30s usually end up in either  
locker under a main cabin settee, aft of the head bulkhead (on the  
port side), or the hanging locker (on the starboard side).
You must also make sure that there are no void/bubbles in the  
fiberglass--you can check that during the recommended pre-test with  
the transducer in a bag of water over the chosen spot. That should  
not be a problem with the A30 hull.
By the way, a few years ago, mineral oil was the liquid of choice. It  
is still an option, but these days manufacturers recommend Propylene  
glycol (non-toxic antifreeze/coolant--that's the pink one). I don't  
know why the switch.

Bernard Rochet
608 Sunswept


On 28-Dec-08, at 2:18 PM, public-list-request at lists.alberg30.org wrote:

> Original Message:
> Date: Sat, 27 Dec 2008 19:25:34 -0500
> From: "Bob Norway" <examiner at cfl.rr.com>
> Subject: [Public-List] In-Hull Transducers
> To: <public-list at lists.alberg30.org>
> Message-ID: <008201c96882$ccc1f430$6645dc90$@rr.com>
> Content-Type: text/plain;	charset="iso-8859-1"
>
> Hi All,
>
>
>
> As a new Alberg 30 owner I would like to wish you all a Happy New  
> Year. I?m
> sure mine is going to be exciting.
>
>
>
> I am planning on installing a new depth sounder with an in-hull  
> transducer
> and would like to know if anyone else has done so, and if so, where  
> did you
> determine the best location for the transducer.
>
>
>
> Thanks for any help you can provide.
>
>
>
> Cheers,
> Bongo Bob Norway
> S/V Beowulf
>
> #488
>
>