Thread: Fish city boats

Originally Posted by pepper123

Correct I used to build these at kingfisher and they are a great design and use quality aluminium.


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What grades for what parts?

Originally Posted by veitnamcam

What grades for what parts?

Marine grade for the hull obviously and extrusion for rub rails , . All nz aluminium. They are not made there anymore. Made in Hamilton now.


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Originally Posted by pepper123

Marine grade for the hull obviously and extrusion for rub rails , . All nz aluminium. They are not made there anymore. Made in Hamilton now.


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There are many grades of "marine" 5052 5083 5086 5251 etc

Originally Posted by veitnamcam

There are many grades of "marine" 5052 5083 5086 5251 etc

Different grades for each size model mr Vietnam, they all resist the salt water and they all weld like crap once been used in the ocean for a year or two ,


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Originally Posted by pepper123

Different grades for each size model mr Vietnam, they all resist the salt water and they all weld like crap once been used in the ocean for a year or two ,


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Yes and there is very significant differences in both strength and corrosion resistance between the grades, boat manufactures should state what grades are used on their websites so buyers can make informed decisions IMO

Originally Posted by veitnamcam

Yes and there is very significant differences in both strength and corrosion resistance between the grades, boat manufactures should state what grades are used on their websites so buyers can make informed decisions IMO

I wouldn't go as far as saying significant differences in corrosion mr Vietnam , 5000 series and 6000 series have different compounds , if you can imagine a 4m boat has a tighter shape in the hull you will use a 5025 series to pull in that sheet to the frames . Another example is a 9.5m naiad hull we used a 8mm still in the 5000 series to compensate for the tight V in the nose . The bigger vessels even 18m use the 5000 series also . It's all good stuff m8 I wouldn't loose sleep over grades. The idea behind aluminium is use New Zealand made stuff it's the best of the best , Chinese and Indonesian aluminium have a high copper nickel and lead content to replace the important stuff called silicone. So might pay to ask the manufacturer where they got there material


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Oh yes there is, 5052 is commonly touted as "Marine grade" but even the nz manufacturer does not rate it for continuous immersion in salt water, it is also soft as butter when compared with the likes of 5083 which really must be pressed with a radius bar to prevent cracking.

Isnt there an H rating after the alloy grade for hardness? 5083 H32 or H34

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Originally Posted by Mathias

Isnt there an H rating after the alloy grade for hardness? 5083 H32 or H34

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For each grade there is a scale of temper from minimum to maximum.....it can play havoc when jig bending custom extrusions and the temper is not the same as the last batch and becomes unusable.

Originally Posted by veitnamcam

Oh yes there is, 5052 is commonly touted as "Marine grade" but even the nz manufacturer does not rate it for continuous immersion in salt water, it is also soft as butter when compared with the likes of 5083 which really must be pressed with a radius bar to prevent cracking.

Everyone throw away there encyclopaedias this guy knows everything


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Hahaha

Originally Posted by pepper123

Everyone throw away there encyclopaedias this guy knows everything


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Maybe because it is his bread and butter trade

Originally Posted by pepper123

Everyone throw away there encyclopaedias this guy knows everything


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Some people would buy a laptop with no thought or concern as to how much memory or ram it had or its proccessor speed and some wouldnt.
Some people would by a car with no thought as to weather front wheel drive or rear some wouldnt.
Some people would buy a boat with no thought as to what it is made of and some wouldnt.....thats all I am trying to say.

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Originally Posted by veitnamcam

Some people would buy a laptop with no thought or concern as to how much memory or ram it had or its proccessor speed and some wouldnt.
Some people would by a car with no thought as to weather front wheel drive or rear some wouldnt.
Some people would buy a boat with no thought as to what it is made of and some wouldnt.....thats all I am trying to say.

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Touching poem


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Originally Posted by veitnamcam

Some people would buy a laptop with no thought or concern as to how much memory or ram it had or its proccessor speed and some wouldnt.
Some people would by a car with no thought as to weather front wheel drive or rear some wouldnt.
Some people would buy a boat with no thought as to what it is made of and some wouldnt.....thats all I am trying to say.


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And well played, Sir VC