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Cost of Rubbing Strakes


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Depends if you can find a welder who is brave enough to weld them without removing the paneling and insulation. 

 

Then you will need to be docked or craned out, not a nice job to attempt while afloat. 

 

The last 'D section' I bought worked out at £1 a foot . 

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3 hours ago, ditchcrawler said:

I know of one boat where they were screwed on. I dont know the screw spacing or how effective it was

 

At the beginning of the purpose made leisure boat hull some builders used long tack welds top/bottom of the guard irons  water got trapped between the plate & iron forming rust which over time forced the guard irons to buckle outwards later Div1 builders then fully welded top/bottom edges of the guards

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1 minute ago, X Alan W said:

At the beginning of the purpose made leisure boat hull some builders used long tack welds top/bottom of the guard irons  water got trapped between the plate & iron forming rust which over time forced the guard irons to buckle outwards later Div1 builders then fully welded top/bottom edges of the guards

And before that, working boat builders rivetted the guards on - a necessarily intermittent attachment. 

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12 hours ago, Canal321 said:

The last 'D section' I bought worked out at £1 a foot . 

 

The cost of the material is trivial compared to welding it on.

 

When I last worked in an engineering firm we charged welding out at £1 per inch. This was in 1978.

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10 hours ago, Detling said:

Usually wrought iron so not quite as rusty as steel

Beat me to it .When I got my "Josher "in 1958 it was 44 years old & had a working environment from day one, the guard irons in some parts where worn away some but there was little rust formation behind the guard& no bulging of the guards in any place

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If there's a fire risk, for instance if there's spray foam insulation, it might be possible to bond them on with adhesive. Several years ago I was working on a project and went to see a specialist adhesive supplier. I asked for the strongest they had and they laughed. Apparently they had one that would lift a tonne with a two inch square. I believe automotive and aerospace industries sometimes use adhesives now where welding was traditionally used. 

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11 hours ago, Laurie.Booth said:

Very reasonable

:) 

That's looking at two each side, did I miss where you said that Laurie?

I agree that it could become complicated regarding fire control on the inside, especially as you're looking at a continuous weld.

 

Are you prepared to be stripping out cabin lining and insulation as well?

Are you looking to upsweep the guards at the pointy end or are you stopping in line with it?

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12 hours ago, Mike the Boilerman said:

 

The cost of the material is trivial compared to welding it on.

 

When I last worked in an engineering firm we charged welding out at £1 per inch. This was in 1978.

Getting a boat built by them would have been a bit expensive.

 

How many inches of welding in a modern 57 foot boat I wonder.

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1 minute ago, David Mack said:

It's two welds each side for one rubbing strip.

Ah, right, I had my eyes shut when I read MtB's summing up, I thought top and bottom as being a strake at the top and one at the bottom each side.

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2 hours ago, stegra said:

If there's a fire risk, for instance if there's spray foam insulation, it might be possible to bond them on with adhesive. Several years ago I was working on a project and went to see a specialist adhesive supplier. I asked for the strongest they had and they laughed. Apparently they had one that would lift a tonne with a two inch square. I believe automotive and aerospace industries sometimes use adhesives now where welding was traditionally used. 

 

 

This is not new. When I worked for an aircraft component manufacturer back in 1976 lots of structural parts were glued together with adhesives (made by Ciba-Geigy IIRC).

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35 minutes ago, Mike the Boilerman said:

 

 

This is not new. When I worked for an aircraft component manufacturer back in 1976 lots of structural parts were glued together with adhesives (made by Ciba-Geigy IIRC).

Maybe that is what they fit rivets on with these days

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Aircraft are indeed widely bonded together, where weight saving is a priority.

 

Many cars also have significant areas of adhesive bonding rather than welding, esp when dissimilar materials are used.  In may cases the steel "safety cage" is welded steel, but other parts, incl suspension mounts & outer panels are aluminum bonded onto the steel.  When newly applied, these adhesives are stronger than the metal they are stuck to.  Rivets, bolts or other fasteners add significant weight and are not used much.

 

The only but is the long term behaviour of these adhesives, esp during English wet and salty winters and also after what seem to be minor impacts.

 

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25 minutes ago, Cheshire cat said:

Aircraft aren't designed to come into contact with immovable solid objects. 

Sooner or later guardrails will have to justify their existence. I can't imagine glue being able to cope.

True, however an aircraft travelling through the air even at 500 mph is in contact with a powerful force.

Ask this poor sod.

 

 

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