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Old 31 August 2009, 17:30   #1
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Rib End Cones Inquiry

Besides pure aesthetic issues, what would be the advantage/dissadvantages between traditional triangular end cones compared to modern straight round end cones use on a sib, as tube ends slightly touches water. Any ideas, thoughts ?

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Old 31 August 2009, 17:44   #2
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i dont think there would be much difference ,though i suppose that with the triangular cones they dont touch the ground as easy if tilted up on a trailer,,though going on surface area there is problely a bit more bouyancy with the rounded ends and it may be that you could get a fraction more speed with rounded ends as in theory the waterline length is slightly longer ,,and i suppose they would not split up a wave as triangular ones do if hit from astern ,another is that with triangular there is a possibility of the ends catching or getting stuck into something eg horizontal timbers on a harbour wall or woodern jetty say if left moored up. but even then they will usually pop back out with a plonk ,,,where as rounded with fend off more
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Old 31 August 2009, 18:57   #3
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Good tech points, specially the round fending more than triangular. Would you say that new ribs are comming out of the factory with round end cones, much prefered than triangular ones ?

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Old 02 September 2009, 05:29   #4
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Could it be down to the fact it may have been easier in the early days of toob design to create a cone to finish the toob off?

Surely the waterline length is going to be irrelevant on a planing craft?
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Old 02 September 2009, 13:18   #5
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Just to confuse the issue even further - on Atlantics they have 'turned up' triangular/cone end on the sponsons!!
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Old 02 September 2009, 13:47   #6
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Quote:
Originally Posted by DGR View Post
Just to confuse the issue even further - on Atlantics they have 'turned up' triangular/cone end on the sponsons!!
Thats so if you launch it off a big wave and come down vertical the first point to hit the water is the upturned end which in theory should pivot the boat forwards reducung the chance of capsize.
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