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Keith_Callaghan View Drop Down
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Posts: 80 		Post Options Post Options   Quote Keith_Callaghan Quote  Post ReplyReply Direct Link To This Post Topic: Hadron H2
    Posted: 12 Feb 17 at 3:46pm
Originally posted by Oatsandbeans

Aramid in the hull? If it was me I'd ditch that. It doesn't do much in the laminate at all structurally, it is a pain to work with, absorbs water and is expensive. Stick some more carbon or glass in and you wiil get more strength and stiffness.

Aramid is only used in the foot well,to increase impact resistance.
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Oatsandbeans View Drop Down
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Posts: 382 		Post Options Post Options   Quote Oatsandbeans Quote  Post ReplyReply Direct Link To This Post Posted: 12 Feb 17 at 4:41pm
Personally I'd stick another layer of glass in
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davidyacht View Drop Down
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Posts: 1345 		Post Options Post Options   Quote davidyacht Quote  Post ReplyReply Direct Link To This Post Posted: 12 Feb 17 at 7:47pm
We used an 60/40 carbon aramid twill in a Twelve a few years back to give some ding/puncture resistance, which I think was achieved. I am not sure that moisture absorption is a big issue for boats that are not kept afloat.  However aramids are poor in compression compared with carbon, so if stiffness is the driver then carbon is probably the choice material.  Also aramids are a pain to trim.
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Oatsandbeans View Drop Down
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Posts: 382 		Post Options Post Options   Quote Oatsandbeans Quote  Post ReplyReply Direct Link To This Post Posted: 12 Feb 17 at 8:17pm
Yes, you are right Aramids have zero strength in compression ( no more than resin) and cutting them is always difficult. They were used in the 80's /90's because Du Pont did such a good marketing job on them Now none of the raceboat laminates would have any Aramid in -things have moved on. They have low SG so they can give lamiante thickness but there are better and cheaper ways of getting laminate thcikness if you want it.
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423zero View Drop Down
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Posts: 3419 		Post Options Post Options   Quote 423zero Quote  Post ReplyReply Direct Link To This Post Posted: 12 Feb 17 at 9:47pm
Aramid ! are snooker balls made from this ?
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I luv Wight View Drop Down
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Posts: 628 		Post Options Post Options   Quote I luv Wight Quote  Post ReplyReply Direct Link To This Post Posted: 12 Feb 17 at 10:28pm
Ivory is  ( used to be ) good for snooker balls. 

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Rupert View Drop Down
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Posts: 8956 		Post Options Post Options   Quote Rupert Quote  Post ReplyReply Direct Link To This Post Posted: 13 Feb 17 at 7:26am
Flat Stanley, the famous Cherub, was built using Kevlar, and appeared to work well enough.
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Do Different View Drop Down
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Posts: 1312 		Post Options Post Options   Quote Do Different Quote  Post ReplyReply Direct Link To This Post Posted: 13 Feb 17 at 7:51am
Hats off to Keith Callaghan for giving full attention to capsize performance. It's called design, making a complete package for a total experience.  Thumbs Up
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Paramedic View Drop Down
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Posts: 929 		Post Options Post Options   Quote Paramedic Quote  Post ReplyReply Direct Link To This Post Posted: 13 Feb 17 at 7:55am
Originally posted by Rupert

Flat Stanley, the famous Cherub, was built using Kevlar, and appeared to work well enough.

Almost all Fireballs are too. But carbon is better if its allowed, which it isn't in fireballs and probably wasnt readily available in Flat Stanley era. To be honest i'd be very interested to put someone like Christian Birrel in a glass fireball and see if he noticed the difference.
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Oatsandbeans View Drop Down
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Posts: 382 		Post Options Post Options   Quote Oatsandbeans Quote  Post ReplyReply Direct Link To This Post Posted: 13 Feb 17 at 8:46am
Just shows you that despite the science you can build a dinghy out of any old stuff and it will probably be OK.
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