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Fittings - which are the best
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bovlike View Drop Down
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Posts: 221 		Post Options Post Options   Quote bovlike Quote  Post ReplyReply Direct Link To This Post Topic: Fittings - which are the best
    Posted: 29 Jun 07 at 8:08pm

Originally posted by MainlySwimming

Anyone tried the new Ronstan Orbit ratchet blocks yet?  The ones that have on / off and auto settings?

yup i got a pair just before the musto skiff worlds.

very cool looking, very very light, they work realy well i was using the in auto mode. and they are not to expensive. about £45 each

but i do have a large ronstan logo on my sail.  
Ian (Bov) Turnbull
18ft Skiff Ronstan UK
Chandlery, tapered ropes and specialist solutions for sailors who demand the best - BovBoats.co.uk
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Smight at BBSC View Drop Down
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Posts: 1129 		Post Options Post Options   Quote Smight at BBSC Quote  Post ReplyReply Direct Link To This Post Posted: 29 Jun 07 at 4:36pm
That happens on our 200 outhaul we had to get a new wheel for the back of the boom as the rope had sawed through the last one.
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gary View Drop Down
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Posts: 55 		Post Options Post Options   Quote gary Quote  Post ReplyReply Direct Link To This Post Posted: 28 Jun 07 at 4:58pm

Originally posted by timnoyce

But surely the diameter of the dyneema isn't thinner than that of the wire is it? I would have thought that 3 or 4 mm would be perfect for a cascade, no point going any thinner.

True, but dyneema and lightening rope can be flattened into much thinner than the diameter, and can then slip down the side of the pulley.It can be a big probelm when using rope on blocks meant for wire. With wire this is much less of an issue.

It happened on my strut mid race and totally jammed it up. I've got thicker rope on there now and it works a treat. 
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timnoyce View Drop Down
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Posts: 1991 		Post Options Post Options   Quote timnoyce Quote  Post ReplyReply Direct Link To This Post Posted: 28 Jun 07 at 3:33pm
We've got a pair but they've yet to make it onto a boat. First glimpse is a definite WOW, they look very trick and are very light. I'll give you an update once I've tried them out on the water as I think that is where it actually counts 
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Posts: 65 		Post Options Post Options   Quote MainlySwimming Quote  Post ReplyReply Direct Link To This Post Posted: 28 Jun 07 at 2:02pm
Anyone tried the new Ronstan Orbit ratchet blocks yet?  The ones that have on / off and auto settings?
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timnoyce View Drop Down
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Posts: 1991 		Post Options Post Options   Quote timnoyce Quote  Post ReplyReply Direct Link To This Post Posted: 28 Jun 07 at 1:57pm
But surely the diameter of the dyneema isn't thinner than that of the wire is it? I would have thought that 3 or 4 mm would be perfect for a cascade, no point going any thinner.
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chic View Drop Down
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Posts: 146 		Post Options Post Options   Quote chic Quote  Post ReplyReply Direct Link To This Post Posted: 28 Jun 07 at 1:40pm

I have had experience with what Gary notes and it is a real issue - in the attempt to lower friction by using smaller diameter spectra there's a real chance that the line will jam between sheave and block, pulling the entire block apart!  Neither are Harken blocks immune, I have broken a couple of high-load blocks this way.
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gary View Drop Down
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Posts: 55 		Post Options Post Options   Quote gary Quote  Post ReplyReply Direct Link To This Post Posted: 28 Jun 07 at 1:18pm
Be careful that the rope you use isn't thin enough to slip down between the pully and the sheeve. I have change a wire cascade to rope on my boat and upped the diameter a little to stop this

Edited by gary
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WildWood View Drop Down
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Posts: 136 		Post Options Post Options   Quote WildWood Quote  Post ReplyReply Direct Link To This Post Posted: 28 Jun 07 at 11:57am
Thanks Stan, that was what I thought.  I've just replaced the wire with 3mm dynemma and it seems to work fine.  3mm dynemma should be plenty strong enough as well - probably stronger than the wire block max load infact....
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Posts: 78 		Post Options Post Options   Quote BigFatStan Quote  Post ReplyReply Direct Link To This Post Posted: 28 Jun 07 at 10:34am
Originally posted by WildWood

Any advice on using rope through a wire type block, for example if replacing a wire cascade kicker with rope (dynema) and still using the same blocks.  Presumably if the rope diameter is the same as the wire was there shouldn't be a problem?



There will be no problems running dyneema through a wire block - you will probably find that the manufacturer quotes a bigger max rope size than max wire size - this is due to the greater strength of wire - a one inch wire block might be stronger than 2mm wire but big enough for 4mm dyneema (but the block will not be stronger than 4mm wire - hence if you put larger wire through you'll be out of warranty - and also thicker rope will happily go round a smaller sheave than the same thickness wire). My vang top block is a one inch wire block with 3 mm dyneema through it - works a treat.
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