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Extension size differences between brands?

 
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norcom



Joined: 16 Jun 2008
Posts: 133

PostPosted: Thu Nov 10, 2011 6:01 pm    Post subject: Extension size differences between brands? Reply with quote

I picked up a Neil Pryde carbon extension with the EU pin base and while comparing it to my Chinook aluminum US base extension I noticed that the measurements were off. Have I been rigging my sails with the wrong extension setting? I have Ezzy and Gaastra sails.

The carbon extension also feels much heavier, hoped it would be lighter.



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Neil Pryde EU pin vs Chinook US extension size
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damel



Joined: 15 Jul 2007
Posts: 224

PostPosted: Thu Nov 10, 2011 6:37 pm    Post subject: Reply with quote

This is totally a problem but the way you are aligning the extensions is incorrect. You should line them up so the center of the pulleys are in the same position not where the universal piece begins. I am sure they are still off but from what I can tell they will be closer.

What I have found more frustrating is that 2 extensions from Chinook that I got have different measurements. Both extensions are for RDM mast US Uni but one is aluminium and the other is carbon. I always need to add 2 cm to the aluminum one. I have started using only aluminium extensions because of this and because alum. extensions bend rather than break in the waves so you can still get in.

If you want to get really serious you measure from the tip of the mast to the center of the pulleys and add 2cm if the sail as a vario top. I think it is always better to tune based on the leach twist the rec base settings mostly just help prevent you from needing to readjust the extension while rigging.

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norcom



Joined: 16 Jun 2008
Posts: 133

PostPosted: Thu Nov 10, 2011 6:50 pm    Post subject: Reply with quote

damel wrote:
This is totally a problem but the way you are aligning the extensions is incorrect. You should line them up so the center of the pulleys are in the same position not where the universal piece begins. I am sure they are still off but from what I can tell they will be closer.

What I have found more frustrating is that 2 extensions from Chinook that I got have different measurements. Both extensions are for RDM mast US Uni but one is aluminium and the other is carbon. I always need to add 2 cm to the aluminum one. I have started using only aluminium extensions because of this and because alum. extensions bend rather than break in the waves so you can still get in.

If you want to get really serious you measure from the tip of the mast to the center of the pulleys and add 2cm if the sail as a vario top. I think it is always better to tune based on the leach twist the rec base settings mostly just help prevent you from needing to readjust the extension while rigging.


My thought was exactly the same after I posted and looked at the picture closer; it's still way off. I'm mostly worried about ripping the luff sleeve if I put too much downhaul on it. I guess I'll measure which one is closer to the correct length and go from there. I'm new to the sport so going by the manual is easier than trying to adjust it by feel/look.



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NP vs Chinook Extension
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norcom



Joined: 16 Jun 2008
Posts: 133

PostPosted: Thu Nov 10, 2011 8:11 pm    Post subject: Reply with quote

So I had to find out which one was wrong. Very Happy

The NP extension is 4cm off. The Chinook measured correctly. It was NP mast . Confused
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bred2shred



Joined: 02 May 2000
Posts: 666
Location: Jersey Shore

PostPosted: Thu Nov 10, 2011 9:04 pm    Post subject: Reply with quote

There's no need to worry about tearing the luff sleeve. You'd likely snap the mast or break the downhaul line before the sail broke, and even that is highly unlikely. Seriously, the materials that these components are made from are super tough.

As far as your base extensions go, like the other poster said, the true luff length measurement should be the total length from the tip of the mast to the downhaul pulleys on the base extension. Masts and extension measurements can vary between manufacturers, so the best way is to verify your settings using a tape measure, especially if you're not sure how to rig by looking at a sail. Also keep in mind that most newbies rig their sails without enough downhaul tension, don't be afraid to crank it down.

sm
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swchandler



Joined: 08 Nov 1993
Posts: 6026

PostPosted: Fri Nov 11, 2011 1:58 pm    Post subject: Reply with quote

"I'm new to the sport so going by the manual is easier than trying to adjust it by feel/look."


The luff length recommended in the manual is a good starting point, but it's the look that determines what's best in the end. Also, one must take into consideration that the correct downhaul setting is not an absolute. Like with outhaul, there are a range of possible settings where a sail can be considered properly rigged. This allows the sail to be tailored to different sized sailors, and in addition, it gives the flexibility to work in varied conditions (light vs. heavy winds).

I recognize that being new to the sport makes it tougher initially to achieve the best results, so what I would recommend is getting some advice from more experienced sailors in your area. Then after that, you can subtly adjust the downhaul to your personal preferences. Don't be afraid to experiment a bit.
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Ugly_Bird



Joined: 04 Nov 2008
Posts: 153

PostPosted: Fri Nov 11, 2011 4:34 pm    Post subject: Re: Extension size differences between brands? Reply with quote

norcom wrote:

The carbon extension also feels much heavier, hoped it would be lighter.


Chinook US cap carbon extension is much lighter than corresponding Chinook aluminum extension.

Andrei.
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damel



Joined: 15 Jul 2007
Posts: 224

PostPosted: Fri Nov 11, 2011 4:41 pm    Post subject: Reply with quote

Windsurfers can talk forever about how they rig. I recommend taking a look at some videos that are rigging guides from sail companies.
NeilPryde's Rigging Page: http://gallery.neilpryde.com/videos?c=2
Ezzy's Rigging Page:http://www.ezzy.com/rig-support/rigging-videos/

Don't worry about watching a video from the same manufacturer you are using all of the concepts are the same and each video will probably point out something new. When you find a setting that works well remember the setting then make very small changes to fine tune it from there. How the sail is tuned will seriously effect your sailing experience.

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norcom



Joined: 16 Jun 2008
Posts: 133

PostPosted: Fri Nov 11, 2011 9:18 pm    Post subject: Reply with quote

Thanks for all the advice. I try to play with the adjustments but honestly they just don't feel that different to me, yet. I still keep changing it up though, just to see what happens. Wish there were some steady winds over 10mph here.
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kevinkan



Joined: 07 Jun 2001
Posts: 1169
Location: San Francisco

PostPosted: Wed Nov 16, 2011 2:08 pm    Post subject: Reply with quote

Extension length markings are indeed non-standard. One of the biggest pieces of advice I can give is not simply to "rig to the numbers". The numbers are a good starting point, but when you consider that the downhaul tuning range of your sail is a few cm's, throw in the fact that your 430cm mast may not actually be exactly 430cm (measure it and see), and that the reference markings on different extensions don't match up, you need to rig, tune, evaluate, and then re-tune to get the feel you want. It's a total pain, and some sails are more forgiving with regard to tuning, but unfortunately that's what you should do if you want to get the most out of your sail.

Here's the way Maui Sails measures extension length, and I think it's the best way to do it. Of course, this assumes that your mast is exactly the length it's supposed to be... best to measure it and know for sure, calibrate your settings to this.



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