debth transducer instal

[seadawg]

I've read a lot of posts about in-hull debth transducer installations but no one has mentioned the hull liner. Has anyone had to deal with this? I need to install a new P-79 in hull transducer and could sure use some suggestions on dealing with the liner. Transducer location ideas would be helpful also. Boat is a 22d

[Ron M.]

I would cut the liner neatly , 2 - 3" square or carefully with a hole saw with the pilot set as low as possible. You will probably need a fairing block so your transducer will mount vertical to the hull angle.
Mine is installed just forward of amidships beneath the starboard bunk.I have good access to it through the door below the bunk, I also cut a access panel in the plywood beneath the cushion.
Read the installation instructions.
________
Weed vaporizer

[seadawg]

Thank you, cutting holes in the hull is a little scary when you are on your own. The p-79 is an "in hull" transducer and hopefully it will work better in contact with the outside hull rather than the lining. The dead rise is adjustable on the p-79. Thanks again, See ya Charles.

[Leo MacDonald]

Hi Mr Dog,

Go to AIRMAR; www.airmar.com, 603-673-9570.

They are the manufacturer of most of the transducers with which we deal, select 'in hull'. They have quite a write up on this subject

No air voids or cored hull voids!

[Troy Scott]

Seadog,

First a story: MANY years ago, I had a new CD22. Water would sometimes collect in a locker which had no drain. I decided to drill a small hole in the liner to let the water find it's way to the bilge. Imagine my surprise when a little fountain of seawater appeared in the locker.

The point is: There are lots of places where globs of thickened resin are used to attach the liner to the hull. These places are solid all the way to the ocean. Be careful if you try to remove a section of liner. An easier option might be to decide where you want the transducer, drill a few small holes into the cavity between the liner and the hull, and inject thickened resin into the void to make that area solid. If you make the mix like peanut butter and inject it with a LARGE hypo or similar, it will stay where you put it. You need to avoid air bubbles as they will confuse the transducer.

I've read a lot of posts about in-hull debth transducer installations but no one has mentioned the hull liner. Has anyone had to deal with this? I need to install a new P-79 in hull transducer and could sure use some suggestions on dealing with the liner. Transducer location ideas would be helpful also. Boat is a 22d