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Old 07 December 2009, 12:54   #1
gtflash's Avatar
Country: UK - England
Town: southampton
Boat name: TOP CAT 2
Make: Scorpion 8.1
Length: 8m +
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Posts: 1,188
Warped hull moudling

Ive spent ages wondering HOW they mould 2 or 3 or 4 different hull lengths out of one mould when its NOT a constand deadrise hull.

Can someone spoon feed me, as my tiny brain really struggles with this. I can only presume that there is a constant deadrise flat section aft and for eg on a 6.5m boat this is tiny, yet on a 9.5m this is 3m longer?????? Or do they do something different?

Im sure this question was asked several years ago by myself and i never understood the answers

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Old 07 December 2009, 13:01   #2
Country: UK - Wales
Town: West Wales
Make: Vipermax 5.8, SR4.7
Length: 5m +
Engine: 150 Opti, F50EFi
Join Date: Sep 2005
Posts: 6,298
Are you thinking of the different profile of the hull where the transom 'dam' sits in the mould?
I expect the laminators use a different size chunk of plasticine to seal off the transom dam to the hull, or maybe different transom dams for the different hull lengths.

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Old 08 December 2009, 02:53   #3
biffer's Avatar
Country: UK - England
Town: swanwick/hamble
Boat name: stormchaser
Make: custom rib
Length: 8m +
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in a lot of moulds the back half is parallel and the transom section can be bolts where you like but 3 metres is a bit much, general rule is that the boat is approximately three time longer than the width ie 8 mts long 2,6mts wide, there is a balance, i wouldn't take a 6mt out of an 8mt mould, it would be to wide and not a good boat, have a look at the pic, the back half is parallel
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Old 08 December 2009, 04:56   #4
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Country: UK - England
Town: Up Norf
Make: Avon SR4,Tremlett 23
Length: 4m +
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Most of the Humbers appear to be done like this. ie the beam doesn't change in a 6m to a 8m.
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Old 09 December 2009, 12:02   #5
Country: UK - Wales
Town: Southampton
Boat name: DynaMoHumm/ SRV/deja
Make: Avon8.4, 5.4 & 4.777
Length: 8m +
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MMSI: 42
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agreed but Biffers talking about a quality hull
Here it comes again, I don't stand a chance
Soul possession, Got me in a trance
Pullin' me back to you - Deja Voodoo
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Old 13 December 2009, 14:54   #6
Country: UK - England
Town: Dorset
Length: no boat
Join Date: Dec 2009
Posts: 7
Many manufacturers use a sliding transom system on larger moulds to select a particular length in thier range.

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