Non-cored place in hull for depth transducer?

[kerrye]

Is there a spot on the A25 where the hull is solid fiberglass to install a transducer for a depthfinder/fishfinder? They won't shoot thru a cored hull and it looks to me like a lot of the A25 hull is cored, unless I am misinterpreting the extra thickness in the lower hull.

[DesertAlbin736]

I don't know about being cored or not, but I suspect the bottom is solid f/g. Our transducer (Garmin fish finder) was placed under the starboard bench seat storage compartment, accessible by lifting the thin plywood floor panel out. Was installed as a through hull, not a shoot through. Of course now the batteries are right over top of it, so if I had to get to it I'd have to unhook and remove all three batteries.

[kerrye]

I don't want to drill another hole in the hull. If I can't shoot thru the bottom, I'll use a transom mount. If the hull is not cored, what is the transition line which indicates a change in hull thickness about a foot below the deck line all around the boat (visible in the interior behind the liner)?

[denchen]

Not the best picture but if you look in the bottom right corner you can see my brass prop shaft greaser, just forward of this is one of my echo sounder transponders. The transponder is fitted in a home made plastic tube that is polyester resined down and filled with cooking oil. Yep I used cooking oil and its been there for quite a while and works a treat. I have a duel frequency transponder outboard on the stern for a fishfinder.

[kerrye]

Thank you. I'm not that familiar with transponders, can you explain the difference between that one and the dual frequency one. What happened to your fuel tank? Shouldn't it be where your batteries are?

[denchen]

Most fuel tanks seem to be on the Port side but mine was as it is now so I left it there....
The transponder in my boat I guess is like a tubular drum I guess about 1 1/2 inches wide and about 1 1/4 inches long with a moulded threaded plastic male tread of about 1/2 inch dia and about 4 inches long. Through this threaded bit is the cable that goes to the instrument, it can be fitted by drilling a hole through the hull and held by two nylon nets or as I have done by putting it in a tube and getting out all the air. Mine is an old one I think it operates at 1500 kHz.
The duel frequency transponder on my stern is shaped. Like a small model boat and is fixed to a hinged plastic bracket so should it hit anything it will be turned out of the way. This is operating on two frequencies at the same time, there is only one cable from it to the display screen that gives two pictures of whats happening underwater. One picture is a raw coloured picture, the other is a sepia computer enhanced picture. I use the old system for shallow water navigation, the new system for looking for fish. The old system is quick start up as the new system take a while to `boot up`

[kerrye]

Now, I see, you're in the UK. That might explain things on the other side. Thanks for the help. Where do you use your A25? If you're ever interested in a swap and want to use ours in the US, we'd like to do some English canals sometime. I spent part of my youth in Shipley and used to fish the Leeds and Liverpool canal as a kid.

[denchen]

I use my boat in The Wash and The North Sea off Norfolk and Lincolnshre. I guess you know both waters are very tricky and can be character building if you get it wrong. Back to echo sounders, I have a Nasa Marine Stingray echo sounder and a Lawrance Elite 5xHDI fishfinder. I dodn`t do inland rivers and canals. If I can help give me a call, I realise things are a bit different your side of the pond, its been some while since I was over there.