Dyneema or kevlar for forestay?

   It snapped going up wind outside the breakwater in Plymouth, mast held up by the jib. So hoisted kite and planed all the way back to the slipway, feeling slightly nervous about how long the jib halyard and small jam cleat would hold up. So Dyneema SK78 seems a good option. Thanks

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H4marine Send Private Message Find Member's Posts Visit Member's Homepage Groupie Joined: 16 Jan 08 Location: United Kingdom Online Status: Offline Posts: 46	Post Options Post Reply Quote H4marine Report Post Quote Reply Topic: Dyneema or kevlar for forestay? Posted: 20 Aug 13 at 9:21am
	It snapped going up wind outside the breakwater in Plymouth, mast held up by the jib. So hoisted kite and planed all the way back to the slipway, feeling slightly nervous about how long the jib halyard and small jam cleat would hold up. So Dyneema SK78 seems a good option. Thanks
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Jack Sparrow Send Private Message Find Member's Posts Visit Member's Homepage Really should get out more Joined: 08 Feb 05 Location: United Kingdom Online Status: Offline Posts: 2965	Post Options Post Reply Quote Jack Sparrow Report Post Quote Reply Posted: 20 Aug 13 at 9:46am
	Just so you know... Marlow Ropes are having fibre supply issues with DM20 (MRig) which is why it doesn't seem to be listed anywhere at the moment. Probably all being used in the Americas cup!
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Jack Sparrow Send Private Message Find Member's Posts Visit Member's Homepage Really should get out more Joined: 08 Feb 05 Location: United Kingdom Online Status: Offline Posts: 2965	Post Options Post Reply Quote Jack Sparrow Report Post Quote Reply Posted: 20 Aug 13 at 2:47pm
	And DM20 data sheet for comparisons against SK78 ... creep, elongation, strength, etc...
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alstorer Send Private Message Find Member's Posts Really should get out more Joined: 02 Aug 07 Location: Cambridge Online Status: Offline Posts: 2899	Post Options Post Reply Quote alstorer Report Post Quote Reply Posted: 20 Aug 13 at 3:37pm
	That does of course demonstrate the minor issue with just calling it Dyneema- that's a family of fibres, not a single product.
	-_ Al

H4marine Send Private Message Find Member's Posts Visit Member's Homepage Groupie Joined: 16 Jan 08 Location: United Kingdom Online Status: Offline Posts: 46	Post Options Post Reply Quote H4marine Report Post Quote Reply Posted: 20 Aug 13 at 5:03pm
	Really useful thanks for all the information, I know what you mean, in my business everyone thinks composites are all the same but the base resin name can cover a wide range of material properties. We use a number of different fibres and get some interesting results but in bearings we are looking for different properties to rigging.
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