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Old 07-21-2015, 02:29 PM   #21
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am I wrong in assuming galvanic corrosion can be a larger factor with a steel hull? is the solution just more zincs than what you'd have on a glass boat?
In addition to zincs on rudder and propeller shaft, our boat has eight zincs along the hull bottom.

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Old 07-21-2015, 02:50 PM   #22
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I apologize, my experience is almost 100% commercial on vessels of 50 to over 300 gross tons and I lose sight of reality when I think about boats (which is most of the time). Yes I am aware that manufacturers as opposed to builders of boats have different priorities. I have overseen a couple of new builds and several refits of large trawlers and even then you have to poke around continually to make sure there's no corner cutting. I can only imagine a production shop where the overseer isn't the end user or their representative but an accountant weighing resin and copper wire to control costs.
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Old 07-21-2015, 04:20 PM   #23
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Hi all,
Looking at purchasing a Trawler and was looking for the pro's & con's on steel hulls. I ran a search here at TF, however did not fine anything.

Thanks for the insight!
About half way down the page in the link is a bunch of articles about metal boats, Articles by Michael Kasten - Kasten Marine Design, Inc.. Kasten is a boat designer and for many years was the editor for the Metal Boat Society, Welcome to the Metal Boat Society.

Kasten will give you a very good education on metal boats.

Later,
Dan
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Old 07-21-2015, 04:45 PM   #24
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If there was a working product for preventing long term rust,

I believe the bridge repainting crew would have found it by now.
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Old 07-21-2015, 09:17 PM   #25
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Originally Posted by markpierce View Post
In addition to zincs on rudder and propeller shaft, our boat has eight zincs along the hull bottom.

How do you attach the zincs along the hull?
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Old 07-21-2015, 09:23 PM   #26
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How do you attach the zincs along the hull?
I don't do it. I leave that to the boatyard workers/experts to replace. Ask the builder for how the original set-up was done: Seahorse Marine.
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Old 07-21-2015, 10:08 PM   #27
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looks like bolted to studs...typical install...


On many commercial vessels they are just welded to the hull...
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Old 07-21-2015, 11:44 PM   #28
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The zinc plates bolted to the hull is often called a diver's plate or zinc. They can be replaced by a diver without lifting the boat on the hard. Welding is pretty typical.

As far as the bridge painting goes...We had to repaint the steel webbing of a bridge a few years ago after laying a 20" pipe under the bridge. All holes and attachment hardware were painted with some stuff that I do not even think is legal on boats. Ga. DOT supplied coating. Wish I had a few more gallons of it.
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Old 07-22-2015, 12:38 AM   #29
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Florence A is my boat- 1/4 inch plate steel launched in 1964.
The next picture is a wooden boat about the same age.
Then we come to fiberglass boats both about 30 years old.
So while I can repair all of the boats shown - I like steel. Rust - well yup it does. No boat lasts forever.
What I like about steel the most is it bends when things go horribly wrong.
Fiberglass shatters. Wood - well it bends to until it breaks.
I can cut out a section of the steel hull and weld in a new plate and with x-ray I can be positive that I have 100% of original strength. Wood and fiberglass- less so.
Cons to steel hulls- heavy Florence tips the scale at 104,000 pounds and that is not full of fuel.

But all in all steel is not a bad thing to build boats out of. When looking at boats how well the boat has been maintained counts for a whole bunch more than what the hull is made from. Poor maintenance makes for a poor boat.
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Old 07-22-2015, 12:48 AM   #30
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A better view of Florence A
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Old 07-22-2015, 01:24 AM   #31
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Beautiful boat! International 2 part paint is a really good paint to use. Not sure on the price though
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Old 07-22-2015, 07:02 AM   #32
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Nice looking boat. Are you expecting a cold winter? Looks like you got a bunch of wood put up.
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Old 07-22-2015, 07:34 AM   #33
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Florence A is a beautiful boat!
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Old 07-22-2015, 08:41 AM   #34
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Dan : The boat yard here where I am working on Florence is shared with a log export yard.
It is ok as long as you don't mind bark dust in and on everything. I am thinking that it should work really well for a non skid paint job on the decks.
Everyone of those logs you see in the background will soon be on a ship headed for China.
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Old 07-22-2015, 09:09 AM   #35
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BryanF: Glad we are exporting something. Really nice looking boat. I would appreciate a detailed pic. of your forward and aft boom/davit arrangement. I have spent a year or so trying to figure out a similar arrangement for mine. What type, if any bearing do you have between the boom and mast? Do you control with elec. or hydraulic?
Thanks
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Old 07-22-2015, 09:56 AM   #36
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A better view of Florence A
She sure is pretty.

From the bow pictures, she looks to have a nice, modest beam.

What is the beam and the water line length?

Later,
Dan
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Old 07-22-2015, 10:00 AM   #37
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The issue as I see it is all the attention goes to the exterior while I expect the problems are interior
Few boats are dry in bilge. Stink is the major problem with wet fg bilge. What about steel
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Old 07-22-2015, 10:06 AM   #38
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Hi all,
Looking at purchasing a Trawler and was looking for the pro's & con's on steel hulls. I ran a search here at TF, however did not fine anything.

Thanks for the insight!
Aluminum is also an interesting metal to use in a trawler so do not discount that metal.

What would really be nice is a Copper Nickel or Monel hull with stainless steel framing. Price might be an issue though but you would not have to paint the boat bottom.

I did try to get some prices on Copper Nickel and if the numbers I found were valid, the price was not that bad. I think this is due to the drop in metal prices over the last few years. Monel prices looked to be very high.

Later,
Dan
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Old 07-22-2015, 10:14 AM   #39
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The issue as I see it is all the attention goes to the exterior while I expect the problems are interior
Few boats are dry in bilge. Stink is the major problem with wet fg bilge. What about steel
Steel boats rust out from the interior which is why proper painting and insulation of the hull is so important. It is critical. The paint keeps the metal from rusting. Insulation protects the paint, prevents condensation, and of course insulates.

The steel boats I have looked at had dust in the bilge.

Later,
Dan
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Old 07-22-2015, 01:54 PM   #40
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Dust in the bilge is remarkable. What do the steel boat guys know that the rest of us don't?




OH! maybe you meant rust in the bilge []
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