Talbot
Active member
Should the underwater fittings be bronze or gunmetal,
can these two materials be used together?
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can these two materials be used together?
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Underwater fittings
- Thread starter Talbot
- Start date
Vara
Active member
Re your previous postings weight is an issue,why not consider plastic,passing mention in this months PBO.
I must admit I've no hands on experience of them on a boat but in industrial setting have had no problems.
Galvanic corrosion not a problem!!
<hr width=100% size=1>If it can't be fixed with a lump hammer dont fit it!
I must admit I've no hands on experience of them on a boat but in industrial setting have had no problems.
Galvanic corrosion not a problem!!
<hr width=100% size=1>If it can't be fixed with a lump hammer dont fit it!
ex-Gladys
Well-known member
...most surveyors don't like plastic below w/l...
<hr width=100% size=1>Larry Botheras
Anderson 26 "Amber"
<hr width=100% size=1>Larry Botheras
Anderson 26 "Amber"
Talbot
Active member
Apart from the issue of surveyors not liking the plastic below the waterline, the main reason is the addition of these fittings to the ground plane of the SSB
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john_morris_uk
Well-known member
Agree with the sentiment about plastic - although most transducers are plastic so a bit of confused logic in some of this.
I know that there are some plastic marine grade sea-cocks made, but the answer to the question put is bronze.
Make sure its proper marine bronze (Admiralty bronze sometimes described) and not a sort of brass. Proper bronze is more expensive, but how much does it cost if you boat sinks?
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I know that there are some plastic marine grade sea-cocks made, but the answer to the question put is bronze.
Make sure its proper marine bronze (Admiralty bronze sometimes described) and not a sort of brass. Proper bronze is more expensive, but how much does it cost if you boat sinks?
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Vara
Active member
Do they give any reason for this? Most boat hulls are made of plastic or variants thereof.
<hr width=100% size=1>If it can't be fixed with a lump hammer dont fit it!
<hr width=100% size=1>If it can't be fixed with a lump hammer dont fit it!
alahol2
Well-known member
I heard a long time ago that Lloyds don't like plastic because of the risk of fire melting them. Then again...
<hr width=100% size=1>I really would rather be sailing...
<hr width=100% size=1>I really would rather be sailing...
ex-Gladys
Well-known member
Our man said that they go brittle and break easily - we replaced two cocpit drain skin fittings with bronze... There is a big difference between thermoplastics and laminates
<hr width=100% size=1>Larry Botheras
Anderson 26 "Amber"
<hr width=100% size=1>Larry Botheras
Anderson 26 "Amber"
extravert
New member
Plastic is not a safe an option as bronze for a through hull near or below the waterline, because this can happen...
Read more here...
<A target="_blank" HREF=http://www.yachtsurvey.com/sinking.htm>http://www.yachtsurvey.com/sinking.htm</A>
<hr width=100% size=1>One day, I want to be a real sailor. In the mean time I'll just keep tri-ing.
Read more here...
<A target="_blank" HREF=http://www.yachtsurvey.com/sinking.htm>http://www.yachtsurvey.com/sinking.htm</A>
<hr width=100% size=1>One day, I want to be a real sailor. In the mean time I'll just keep tri-ing.
AndCur
Member
The picture shows exactly the way my NASA log skin fitting failed. Plastic should always be avoided below the waterline but in the case of logs
we don't have much other choice
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we don't have much other choice
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oldsaltoz
New member
G'day John (extravert),
There are plastic fittings and fibre reinforced plastic fittings, the latter are very strong and have no corrosion problems, it might be a little too soon to say they are truly safe, but since they were introduced about 10 years ago, I have never seen or heard of one breaking.
Some manufacturers are producing them to fit logs, but the original manufacturers are not, I suspect this would push the price up and effect their sales figures, but you would think they could offer them as an alternative.
Avagoodweekend.......
<hr width=100% size=1> Old Salt Oz /forums/images/icons/cool.gif Growing old is unavoidable. However, growing up is still optional.
There are plastic fittings and fibre reinforced plastic fittings, the latter are very strong and have no corrosion problems, it might be a little too soon to say they are truly safe, but since they were introduced about 10 years ago, I have never seen or heard of one breaking.
Some manufacturers are producing them to fit logs, but the original manufacturers are not, I suspect this would push the price up and effect their sales figures, but you would think they could offer them as an alternative.
Avagoodweekend.......
<hr width=100% size=1> Old Salt Oz /forums/images/icons/cool.gif Growing old is unavoidable. However, growing up is still optional.
Vara
Active member
Thanks for the replies to my slightly contentious reply.
The point I was making that the path ahead for the perfect underwater fittings is probably plastic,the boating industry and its users are lagging behind progress in other fields ie automotive or domestic plumbing,where plastics in their broadest sense have have transformed utility,reliability and cost.
To condemn all use of plastic because of a few examples of shoddy engineering is blinkered in the extreme .
<hr width=100% size=1>If it can't be fixed with a lump hammer dont fit it!
The point I was making that the path ahead for the perfect underwater fittings is probably plastic,the boating industry and its users are lagging behind progress in other fields ie automotive or domestic plumbing,where plastics in their broadest sense have have transformed utility,reliability and cost.
To condemn all use of plastic because of a few examples of shoddy engineering is blinkered in the extreme .
<hr width=100% size=1>If it can't be fixed with a lump hammer dont fit it!
ex-Gladys
Well-known member
You raise some reasonable points but omit one or two pertinent ones... 1. There may be plastics etc used in Automotive and building "plumbing" apps, but if you have a failure in those cases the chance of dying is much less. 2. Automotive procudt lifetiome is much shorter than a boat
<hr width=100% size=1>Larry Botheras
Anderson 26 "Amber"
<hr width=100% size=1>Larry Botheras
Anderson 26 "Amber"
MainlySteam
New member
<<<...most surveyors don't like plastic below w/l... >>>
How do they get on surveying plastic boats then?
John
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How do they get on surveying plastic boats then?
John
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Vara
Active member
Tell that to audi!!
But whatever they are made of I would still have a low tech wooden plug attached to it with a bit of string/forums/images/icons/smile.gif,or maybe a bit of wire to improve my ground plane(whatever that is).
<hr width=100% size=1>If it can't be fixed with a lump hammer dont fit it!
But whatever they are made of I would still have a low tech wooden plug attached to it with a bit of string/forums/images/icons/smile.gif,or maybe a bit of wire to improve my ground plane(whatever that is).
<hr width=100% size=1>If it can't be fixed with a lump hammer dont fit it!