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Mast Extension minimum measurements

 
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kiethordrum



Joined: 12 Jun 2015
Posts: 25

PostPosted: Mon Sep 10, 2018 1:34 pm    Post subject: Mast Extension minimum measurements Reply with quote

Can anyone help explain bow i measure my total luff to match stated sail downhaul recommendations.
1st hole on a Chinook mast ext is what ?
Where do i measure from on downhaulnrollers rollers.?
Do different base connection types need different measurements?
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dhmark



Joined: 04 Sep 2007
Posts: 376

PostPosted: Mon Sep 10, 2018 2:08 pm    Post subject: Reply with quote

Different Chinook extensions have slightly different distances for the lowest setting, depending on how old, RDM, SDM. (guessing 8-11 cm) It is supposedly the distance to the top of pulleys, its never quite accurate to the printed mark, but downhauling a sail correctly is not exact to printed dimensions. Good starting point IF it is the correct mast.
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swchandler



Joined: 08 Nov 1993
Posts: 10588

PostPosted: Mon Sep 10, 2018 2:45 pm    Post subject: Reply with quote

Rather than getting too tied up in measurement markings, it's best to look at the sail and see how downhaul affects its shape. Most sail designers craft sails to work well over a general range covering light, medium and strong winds. Downhaul adjustment makes it all a reality.

To give yourself easy adjustment and a very fine tuning capability, get a Chinook winch. It makes achieving the perfect setting a breeze, and you don't have to get down on the ground to do it.
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PeconicPuffin



Joined: 07 Jun 2004
Posts: 1830

PostPosted: Mon Sep 10, 2018 2:58 pm    Post subject: Reply with quote

swchandler wrote:
To give yourself easy adjustment and a very fine tuning capability, get a Chinook winch. It makes achieving the perfect setting a breeze, and you don't have to get down on the ground to do it.


Good suggestion. Making tuning easy is a must. If it's hard, you won't make smaller adjustments, and those smaller adjustments can make a real difference. Other ways to make downhauling easier is to learn the threading pattern included in this blog post, and switching your downhaul line to Spectra/formuline. It downhauls much more easily.

http://www.peconicpuffin.com/the_peconic_puffin/2007/03/easier_downhaul.html

_________________
Michael
http://www.peconicpuffin.com
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joethewindsufa



Joined: 10 Oct 2010
Posts: 1190
Location: Montréal

PostPosted: Mon Sep 10, 2018 4:36 pm    Post subject: Reply with quote

wanna know mauisails used to measure it ??

https://www.mauisails.com/video/67
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dhmark



Joined: 04 Sep 2007
Posts: 376

PostPosted: Mon Sep 10, 2018 5:12 pm    Post subject: Reply with quote

That chinook winch has made me such a wimp i even use it to decleat the downhaul when derigging. I dont want to get on the ground, strain my back, rip up my hands....
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cgoudie1



Joined: 10 Apr 2006
Posts: 2597
Location: Killer Sturgeon Cove

PostPosted: Mon Sep 10, 2018 9:23 pm    Post subject: Reply with quote

+2

-Craig

swchandler wrote:
Rather than getting too tied up in measurement markings, it's best to look at the sail and see how downhaul affects its shape. Most sail designers craft sails to work well over a general range covering light, medium and strong winds. Downhaul adjustment makes it all a reality.

To give yourself easy adjustment and a very fine tuning capability, get a Chinook winch. It makes achieving the perfect setting a breeze, and you don't have to get down on the ground to do it.
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