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Old 11 September 2016, 06:00   #1
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Aluminium Hulls- Yes, No, Maybe?

Hi folks,

A general question for those who know more than I do on the subject, not limited to ribs.

What are the pitfalls, if any, in choosing an aluminium hull?

Are you limited in what anti-fouling you can use?
Damage easily?
Noise?
Lifespan?
Corrosion?
Repairs?
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Old 11 September 2016, 06:08   #2
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Great for beaching, more durable, potentially lighter weight. Harder ride, noisier.


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Old 11 September 2016, 07:03   #3
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Also, you mustn't have copper in contact with the aluminium, this probably rules out copper alloys too; cables, coinage, brass or bronze fittings etc.

I don't know whether this is valid for aluminium alloys suitable for boat building but it is certainly the case for most common aluminium alloys, steel in contact with the aluminium and in salt water causes fairly vigorous corrosion.
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Old 11 September 2016, 07:11   #4
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Quote:
Originally Posted by Pikey Dave View Post
potentially lighter weight.

Harder ride, noisier.
I'm not sure about weight ... It depends on thickness of the ALU I think and construction. Mine had ALU solid mast and some back construction from thick ALU (built back). So with petrol 100 l and anchors the total weight of 5,4m ALU RIB is almost 900 kg.

Never have been thinking about "harder ride or noisier"

I think that you be limited to anti foul painting.
It depends on hull type. Mine is powder painting so anti foul is not recommended.

And if you decide to use it you can not use paint having copper (if I remember properly).

Generally GRP hulls usually can have more advanced shapes hard to obtain in ALU hulls (I suppose).

Not sure if you can find stepped ALU hull or air bubble hull like this one mentioned below (AirHull boats .: AirHull :. ??????? ????????? ?????? ??????? ???????? ??????????? ????????):


And in ALU boats usually consoles, jockeys are GRP
In XO boats only hull is ALU but anything else is GRP



I know personally peple taking care about ALU sailboats and commercial boats and they replace anodes and owners have not any problems since more than 20 years.

I wonder why I do not have any anodes in mine boat
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Old 11 September 2016, 07:36   #5
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I'm not sure about weight ...
at the sub 4m boat size Al is usually significantly lighter - never looked at bigger sizes to do comparisons.

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Not sure if you can find stepped ALU hull or air bubble hull like this one
you can make any shape you want, but it will certainly be cheaper to mass produce sophisticated shapes from a mould than welding plates together.

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I wonder why I do not have any anodes in mine boat
Unless it is kept afloat then anodes won't really help anyway. The glavanic corrosion issue is presumably less of a worry for trailered Al boat owners who wash and dry strore the boat anyway?

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Harder ride
Why? Is it just an "ease" of hull shape (i.e. would a GRP mould of the same hull give the same ride?)
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Old 11 September 2016, 07:58   #6
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Why? Is it just an "ease" of hull shape (i.e. would a GRP mould of the same hull give the same ride?)

Yup👍 "generally" the ally hulled boats I've been in are slappy. Due to the plated rather than moulded construction. I guess it depends on how much effort the manufacturer is prepared to put into the hull profile. Also it's not unknown for ally hulls to fail on the welds.


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Old 11 September 2016, 08:07   #7
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Yup👍 "generally" the ally hulled boats I've been in are slappy. Due to the plated rather than moulded construction. I guess it depends on how much effort the manufacturer is prepared to put into the hull profile.
interesting. I wonder if that is "intentional" i.e. there are other aspects of the hull design they've been compromising on - say to get away with less power, with a particular market in mind.

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Also it's not unknown for ally hulls to fail on the welds.
Badly made GRP boats fail too: https://www.gov.uk/maib-reports/hull...rnwall-england
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Old 11 September 2016, 08:33   #8
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if its highfield your thinking about there welding is shocking amongst the worst i have seen thats what sealed the deal with humber i think a fibreglass hull is more durable and easier to repair by mere mortals without a tig welder
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Old 11 September 2016, 10:14   #9
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if its highfield your thinking about there welding is shocking amongst the worst i have seen thats what sealed the deal with humber i think a fibreglass hull is more durable and easier to repair by mere mortals without a tig welder
Made in China....

AB aluminum welds aren't much better.
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Old 11 September 2016, 11:27   #10
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Thanks for all the info.
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