[Public-list] Reefing lines

[FINNUS505 at aol.com]

Here is my best description of a jackline for the luff of the main. A  
diagram in a book on sail making or rigging would probably help.
 
The jackline allows the sail to pull away from the mast and slides on  the 
track, but still be attached to them, so that the sail slides do not have to  be 
slid off the main sail track when reefing.
 
A gromet is placed on the sail just above the luff cringle of the highest  
reef, either 2nd, or third, depending on what you have. A line is attached to  
this grommet, and this line will pass through fairleads attached to each sail  
slide below that point.
 
An additional grommet is put into the sail a few inches below the existing  
grommet for the luff track slides. Fairleads are seized to the now pairs of  
grommets at each sail slide site.
 
The jackline is reeved through all the fairleads at each sail slide site.  
The jackline goes through the top fairlead on the sail, then through the  
fairlead on the track slide, then through the bottom fairlead at each slide  site, 
and so on until the line reaches the tack of the sail. It is made fast  there, 
either to the tack shackle, or some other convenient spot there.
 
Hoist the sail and make the luff up to the tension you want for the current  
wind strength. Then, make the lower end of the jackline fast, pulling the sail 
 to the mast at each track slide.
 
When you lower the sail to reef, the jackline relaxes, and allows the sail  
to pull away from the mast, without having to let the slides off the  track.
 
For the second or third reef, you may have to release the jackline from the  
knot at the tack to give the higher slides more room to pull away from the 
mast.  Even though this means a crew has to go forward, it is still a much more  
controled procedure than releasing the slides from the track.
 
If this description was incomprehensible, as it may well be, look in a  
sailmaking text for a diagram of this very useful device.
 
Hope this helps,
Lee
 
Stargazer #255
In a message dated 10/16/2005 5:53:35 PM Eastern  Standard Time, 
DTERRELL at message.nmc.edu writes:

No  jackline, though I am not sure of it meaning here. As the line comes down 
from  the block on the cringle, all you have to do is to lead it to a turning 
block  at the base of the mast that is positioned so it will pull the line 
forward  and down. If you put the block toward the forward side of the mast, you 
will  accomplish that task.

Help me out with "jackline" in this context,  Please. 

Thanks.

>>> FINNUS505 at aol.com 10/13/05 8:09 PM  >>>

Great testimonial for the single line reefing system! Do  you have a  
jackline 
to let the lower sail slides to pull away from  the mast? Any special  way 
you 
lead the halyard  aft?
Thx,
Lee

In a message dated 10/10/2005 3:27:29 PM Eastern  Standard Time,  
DTERRELL at message.nmc.edu writes:

I use a   single line reefing system - two reefs - two lines. Very simple. no 
 
excess  friction and no one on the cabin house - agile or otherwise.  Works 
like  charm.

Here is the route. The line starts at an  eyestrap (or similar  fitting) on 
one side of the boom, goes under  the boom and up through the leech  reef 
cringle 
on the sail, down the  opposite side of sail  to a cheek  block on the 
opposite side of  the boom, along the boom to an angled cheek  block(the 
angle makes  
for a fair lead and reduced friction) near the mast up  to the luff  reef 
cringle where it goes through a block held in place by a   dogbone in the 
cringle, 
down to a turing block at the base of the mast (  this  block has got to 
allow 
the luff reef cringle to be pulled down  and forward),  and from there back 
to 
the cockpit to a winch and line  stopper. 

This  may seem complex on paper, but in reality it is  quite simple. This 
system has  immensely simplified my reefing  life.




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