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Older Classes With Modern Rigs

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423zero View Drop Down
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Post Options Post Options   Quote 423zero Quote  Post ReplyReply Direct Link To This Post Posted: 29 Jun 20 at 2:01pm
The good old days
Robert
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iGRF View Drop Down
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Post Options Post Options   Quote iGRF Quote  Post ReplyReply Direct Link To This Post Posted: 29 Jun 20 at 3:21pm
The good old days before beach re profiling and near vertical shingle walls after the odd storm or wind direction shift.

Ordinarily that's what happens you can get a fair way up before getting out, but not always.
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423zero View Drop Down
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Post Options Post Options   Quote 423zero Quote  Post ReplyReply Direct Link To This Post Posted: 29 Jun 20 at 7:00pm
The 'good old days' when you could put your kids in a sack and tie them down to the foredeck
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Post Options Post Options   Quote john80 Quote  Post ReplyReply Direct Link To This Post Posted: 29 Jun 20 at 11:41pm
People who want carbon fibre foam cored boats instead of glass and foam often overestimate the weight saving. Most dinghies are already at minimum skin weights for durability of the panel instead of strength. The use of carbon often is wasted as the loads are not high enough and the skin weight cant be dropped further due to lack of skin durability. Just means more money for the boat.

On bigger boats where the loads drive the skin weight and not the durability then it makes sense.
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Post Options Post Options   Quote Cirrus Quote  Post ReplyReply Direct Link To This Post Posted: 30 Jun 20 at 9:14am
Agreed - for most dinghies use of carbon is great for the spars but too often applied simply for  'marketing' purposes in relation to the hull I suspect.   There are exceptions where it is appropriate of course .. but they are very few in reality.   If the customers really are prepared to pay a premium for performance then always (first at least)  in the rig !

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Post Options Post Options   Quote iGRF Quote  Post ReplyReply Direct Link To This Post Posted: 30 Jun 20 at 5:42pm
Carbon fibre resists harness hooks punching holes in the deck better than ply, to that I can attest.

But to do the job properly I think I'd go for some sort of carbon kevlar weave.
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Post Options Post Options   Quote davidyacht Quote  Post ReplyReply Direct Link To This Post Posted: 30 Jun 20 at 7:19pm
Kevlar is not ideal if light weight is a priority having poor compressive strength which is not ideal in a balanced sandwich structure.  It also wicks. Another route to durability might be to go for a higher density core than the ubiquitous H80, which would be less prone to denting, or consider including an additional layer of laminate on the bottom panels.
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Post Options Post Options   Quote Oatsandbeans Quote  Post ReplyReply Direct Link To This Post Posted: 30 Jun 20 at 7:56pm
You are right Kevlar is a pretty awful fibre to have in a composite laminate on a boat due to the problems that you mentioned ( poor compressive strength, water uptake and “fluffing “ up when cut or sanded), but it does do one thing-it has a low density so it will increase the laminate thickness without too much weight increase which can, in itself , improve the impact resistance of the laminate compared to glass or even carbon . But I agree I would never put in a a marine laminate it is expensive and there are better ways of making a dinghy laminate.
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Paramedic View Drop Down
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Post Options Post Options   Quote Paramedic Quote  Post ReplyReply Direct Link To This Post Posted: 30 Jun 20 at 8:18pm
The main advantage of carbon in a hull its its stiffness relative to the same weight of glass. You'd be surprised however at how much glass there is in many carbon tubes and layups because it does do some things better than carbon does.

Why some classes use kevlar I really don't understand. 
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Post Options Post Options   Quote Peaky Quote  Post ReplyReply Direct Link To This Post Posted: 30 Jun 20 at 9:31pm
Anyone have experience with reinforced thermoplastics?
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