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Old 19 March 2004, 12:51   #1
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Aluminium RIB

My company, K4+, has been very active on the RIB design scene for a number of years. However we have just finished the design of our first Aluminium craft. She is being built on the Isle of Wight and the builders are making an excellent job.
She is 7.5 metres with a twin step arrangement. It is a hull system we have developed over some time and the steps are tapered running into a double chine.
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Old 19 March 2004, 12:52   #2
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another shot - actually the hull plating is now mostly finished.
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Old 19 March 2004, 12:56   #3
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Looks interesting, Adam. Will you be racing that RIB?
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Old 19 March 2004, 13:02   #4
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No - unfortunately not - it's being build as a demonstrator by a yard to show both the design and their quality of their workmanship.

However I will hopefully be doing a few events in a 6.5M GRP RIB that we have gone into production of. Does not really fit into the classes now as it is too small for Formula two - but should be fun for some basic races. Also hope to do some cruises during the year.

Also racing an offshore catamaran in the two litre class - so it's going to be a busy and exciting year!
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Old 19 March 2004, 14:17   #5
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ali rib

Hi Adam
nice lines to your ali rib, you do sound as though you are going
to be full on this year, who is doing the work for you over here
regards
tim
www.griffmarineservices.co.uk
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Old 20 March 2004, 11:51   #6
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Have you calculated, how much more weight your boat gather with aluminium hull compared to GRP?
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Old 20 March 2004, 15:36   #7
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The boat is being built by A & M Fabrications on the Isle of Wight and will be used as their own demo boat. Really to show off what can be done with Aluminium and the quality of their workmanship - which I must say is first class. Hopefully we will look into other designs being built as well.

As to weight it is quite possible to build a very lightweight boat with Aluminium - so it comes down to what degree of sophistication you are building with regards to GRP / Composites.

With this boat we have not gone super light weight and have kept the plating to a pretty durable thickness. At the same time this will not give us any weight penalty over a GRP structure. The hull was also designed with this very much in mind.
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Old 20 March 2004, 17:33   #8
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Adam, is the hull a warped flat plate or are you managing to build a composite curve?
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Old 22 March 2004, 15:24   #9
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Hi JW

Yes there is camber in the aft sections which works very well in stiffening up relatively thin hull skins (i.e. Aluminium or non-cored GRP) and providing good initial lift.

The amount of camber is actually reduced in the forward sections so that the sheet can be developed around the bow without the need for forming the material in two directions. However as the sheet is developed conically a section at 90 degrees (i.e. transverse frame) will actually appear to have camber in that plane.

Will get some photos soon showing the forward plating on the boat.

Adam
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Old 22 March 2004, 16:06   #10
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Adam, in this situation, by camber you mean....?

Photos would be interesting. How would you like to crouch down at the bow, at various angles, and take a few shots so we can see the cross section at the hull?
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