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Extension Question
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ryanh50



Joined: 11 Aug 2011
Posts: 9

PostPosted: Tue Oct 17, 2017 4:25 pm    Post subject: Extension Question Reply with quote

Hi,

I ordered a Goya Nexus 6.9 sail and know that the luff length on it is 469. The mast I have is a RDM 460 and I use a US cup base (now regretting not getting Euro Pin).

My question is where to find a skinny extension that will accommodate my luff length of 469. I believe the minimum setting on a Chinook aluminum skinny extension is 12cm. I didn't know how bad of an idea it would be to put a little less downhaul on and use that on the minimum setting.

Thanks,
Ryan
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zirtaeb



Joined: 03 Jul 2009
Posts: 3620

PostPosted: Tue Oct 17, 2017 4:51 pm    Post subject: Reply with quote

Use any extension set at the bottom. 3 cm is just over 1 inch, and u cant tell the diff. Certainly wont matter to you.
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kevinkan



Joined: 07 Jun 2001
Posts: 1375
Location: San Francisco

PostPosted: Tue Oct 17, 2017 5:38 pm    Post subject: Reply with quote

The Streamlined Featherline Carbon RDM Extension for US Cup has a minimum setting of 6cm

https://www.sunsetsailboards.com/collections/streamlined-extensions/products/streamlined-featherline-rdm-us-cup



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ryanh50



Joined: 11 Aug 2011
Posts: 9

PostPosted: Tue Oct 17, 2017 5:53 pm    Post subject: Reply with quote

Thanks for the replies!

Ideally if I could make the Chinook aluminum mast work I would go with that, as long as it doesn't cause any major performance issues or pose a threat of damage to the mast or other equipment. I'm on a budget and can buy the Chinook extension for about half the price of the Streamlined.
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dhmark



Joined: 04 Sep 2007
Posts: 256

PostPosted: Tue Oct 17, 2017 7:58 pm    Post subject: Reply with quote

Chinook aluminum RDM skinny US cup goes shorter than 12 cm (at least mine does). You can see in their catalogue that the MAXIMUM extension for their short RDM extension is 12 cm, and there are at least 2 adjustment holes; thus at least down to 10cm.
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cgoudie1



Joined: 10 Apr 2006
Posts: 2018
Location: Killer Sturgeon Cove

PostPosted: Tue Oct 17, 2017 8:58 pm    Post subject: Reply with quote

Plus your sail will stretch at least that much after 10 or 12 riggings.

-Craig

zirtaeb wrote:
Use any extension set at the bottom. 3 cm is just over 1 inch, and u cant tell the diff. Certainly wont matter to you.
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manuel



Joined: 08 Oct 2007
Posts: 666

PostPosted: Wed Oct 18, 2017 4:36 am    Post subject: Reply with quote

Min is 8cm on Chinook skinny. Removing the clip can go down to 6 but I heard it can split the mast.
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NOVAAN



Joined: 28 Sep 1994
Posts: 895

PostPosted: Wed Oct 18, 2017 5:21 pm    Post subject: Reply with quote

Do not remove the collar and set the mast all the way down. You will break your mast
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manuel



Joined: 08 Oct 2007
Posts: 666

PostPosted: Thu Oct 19, 2017 8:42 am    Post subject: Reply with quote

I got a used mast with an extension stuck collarless inside. Needed a 432 with a 430 mast so used it like that without issues. For a long time. I was lucky. I actually broke the top part of the mast being dragged along onto the reef.
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U2U2U2



Joined: 06 Jul 2001
Posts: 4382
Location: Shipsterns Bluff, Tasmania. Colorado

PostPosted: Thu Oct 19, 2017 9:03 am    Post subject: Reply with quote

NOVAAN wrote:
Do not remove the collar and set the mast all the way down. You will break your mast


I've done this a few times never a problem, never heard of one

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