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Sigma rig setups?

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Post Options Post Options   Quote 3793 Quote  Post ReplyReply Direct Link To This Post Topic: Sigma rig setups?
    Posted: 12 Jun 07 at 12:28pm
Im trying to get some ideas on setting up a Sigma 36 rig. Its bascially the same as the 38s and I wanted to get some tuning guides for them but you have to be a paid up member of there class assosiation to get them and as I don't own one I don't want to be! I was wondering if anybody has sailed them/ ownes one on here and if so and tips for getting more out of the boat.

Cheers.



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Post Options Post Options   Quote Stefan Lloyd Quote  Post ReplyReply Direct Link To This Post Posted: 12 Jun 07 at 12:49pm
I've sailed S/38s but I'm not going to write an essay on tuning them! Do you have a more specific question?
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Post Options Post Options   Quote TimC Quote  Post ReplyReply Direct Link To This Post Posted: 12 Jun 07 at 1:26pm
Isn't the sigma 36 rig very different to a 38? In that one is very fractional with runners and the much less so?

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Post Options Post Options   Quote Stefan Lloyd Quote  Post ReplyReply Direct Link To This Post Posted: 12 Jun 07 at 2:15pm
Sigma/38 is fractional swept-back rig with runners used to tune forestay tension. It's a lot of years since I sailed a Sigma/36 but from what I remember they are the same.
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Post Options Post Options   Quote TimC Quote  Post ReplyReply Direct Link To This Post Posted: 12 Jun 07 at 2:21pm

To be honest I've only sailed the 38 so I'm pretty used to its rig but the only 36 we have at our marina is masthead rigged.

A quick google search shows loads of pics of fractional 36s so I guess the one I've seen must have a custom rig on it.

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Post Options Post Options   Quote 3793 Quote  Post ReplyReply Direct Link To This Post Posted: 12 Jun 07 at 5:18pm
Okay. Sigma 362 is the masthead version the orignal 36 is the fractional version. I've been told to get the caps pretty tight but I have no idea how much rake I want on the rig. Im also intrested in how you use the runners, I know they are for tuning the main and don't support the rig, a friend has a suggested to mark these up, which is great but Im not sure what Im looking for here. I think the main problems are Im used to getting settings off sheets and just going with those and playing aroudn with it. With the Sigma I have no refrences or anything so Im struggling to get started. In previous years the rig has been set up by local riggers but Im unhappy with it now and Im not getting the performance I've seen previously. I think it would be worth my while to sit down and sort it out myself to get better results than they can.
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Post Options Post Options   Quote Stefan Lloyd Quote  Post ReplyReply Direct Link To This Post Posted: 12 Jun 07 at 8:07pm

So are you asking about the fractional version? In that case, no the runners aren't for tuning the main. They are for tuning forestay tension (basically more tension = less power but better pointing).

On a masthead boat, runners tune mast bend. Runners on = straight mast, more power, runners off = bent mast. On a fractional rig checkstays do the same thing if you have them, which a Sigma/36 doesn't.

You want the amount of rake that gives the desired amount of weather helm at the target powered-up angle of heel. Which is all very well if you know either of those targets but you probably don't. Around 50cms of rake is likely to be roughly correct (measured by hanging a weight from the main halyard and measuring the horizontal offset at gooseneck level).

When you say "Im not getting the performance I've seen previously" try to be more specific. Slower? In what conditions? Or not pointing?  Other reason for going slower are bottom in bad condition, or it's time to write the sailmaker a large cheque.

 

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Post Options Post Options   Quote 3793 Quote  Post ReplyReply Direct Link To This Post Posted: 13 Jun 07 at 10:29am
Yeah I realised my mistake about the runners! Read a useful book last night! The problem is before we've only really raced her offshore. So we had the chance to sit there and mess about and in a straight line the Sigma is fast and we got some good results. Started really racing her around the can's this year and just can't get the speeds we've seen out of her. On an upwind leg in say 20kts she used to get about 7.4kts and downwind/ broadreaching anyway over 8. She feels really tender on helm screwing up into the wind alot which she never used to do, in gusts she used to be really steady.

As for sails, she has a brand new UK TD Carbon main on her and new set of spinnakers the Genoa all Sobstad gensis. Apart from the No1 which is the hardest used they are all in pretty good condition.

I just can't think of anything diffrent apart from the rig and its my weakest point, I've never really got into learning about setting it up. From sailing One Design dinghys I've always had referance points and people to talk to.

As I was saying the book I've been reading has given me some ideas to try out, I think its just a case of spending as much time as possible trying new things out.

Cheers for any help!


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Post Options Post Options   Quote Stefan Lloyd Quote  Post ReplyReply Direct Link To This Post Posted: 13 Jun 07 at 12:07pm
I don't know how well your instruments are calibrated but 7.4 knots upwind, if accurate, is "too fast". For optimum VMG on a boat that size something like 6.5-6.8 would be typical once the boat is powered up. Downwind you aren't likely to get the same speeds inshore because the waves are smaller. 
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Post Options Post Options   Quote 3793 Quote  Post ReplyReply Direct Link To This Post Posted: 13 Jun 07 at 12:21pm
At falmouth week last year. We were hitting 7.4 upwind and were holding 8 kts off the wind and getting over 9 at times. The instruments had been califbrated or at least checked over at the begging of 2006.

So what you are saying is 7.4 means we are pointing too low. We need to go for more hight? I.e, increased forestay tension using the runners. The boat dosn't have a VMG meter on it, just wind angle and a couple of displays wind, speed, ect.

Cheers.
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