Hull transducer question

[docofthebay]

I have 2 questions about my '88 300 SD

1: I want to install a thru the hull transducer. Is the hull solid and therefore I can simply bond to the hull or is it cored and therefore I will need to do some digging first to get thru the core to the outer fiberglass layer?

2: My port 8ft antenna is broken. There are 2 cables coming out of the bottom of it before they disappear into the radar arch. Does anyone know what these two cables go to so I will know how to replace the antenna. I only have one VHF. There are also 2 FM radios onboard. There is also a starboard 8 ft antenna. I've never seen a two cable antenna and looking thru catalogs, I only see replacements with one cable.
Thanks!

 

[tobnpr]

I have 2 questions about my '88 300 SD

1: I want to install a thru the hull transducer. Is the hull solid and therefore I can simply bond to the hull or is it cored and therefore I will need to do some digging first to get thru the core to the outer fiberglass layer?

I''m not really sure if you're referring to a thru-hull, or a shoot-thru hull transducer.

Pretty sure you have a solid glass bottom on that yr/model.
If you don't, for a thru-hull, you need to cut the appropriate size hole for the transducer, then remove the coring (using some type of pick) between the laminates around the perimiter of the hole for at least 3/4" or more. Then fill the void with a thickened epoxy mixture. This will prevent moisture intrusion into the core, and won't compress when you tighten the assembly.

A shoot-thru hull transducer will not work on a cored bottom.

 

[docofthebay]

You're correct, I did mean a shoot through the hull transducer. I don't want to do any cutting or digging that isn't necessary and if it is not cored, then a transducer properly bonded to the hull should work--right?

 

[sbw1]

My 86 express was solid FB with no core. I'm pretty sure most smaller boats of that era were all glass hulls. Coring, when it became common in hulls, was mostly used in the bigger boats.

 

[tobnpr]

You're correct, I did mean a shoot through the hull transducer. I don't want to do any cutting or digging that isn't necessary and if it is not cored, then a transducer properly bonded to the hull should work--right?

Absolutely.