Post by Richard Isaac Ceballos on Jan 10, 2022 14:56:44 GMT
The purpose of Back Stay Adjusters is to adjust the Mast Rake and the Jib Forestay tension (while sailing).
THE MAST:
According to (SAIL POWER the complete guide to sails and sail handling) Pg. 143:
Increased Mast Rake increases windward helm and improves sailing to windward (reaching or pointing). Decreased Mast Rake increases lee helm and improves sailing down wind (running).
A WR17 poll indicated that a 6 degree Mast Rake is desirable. So I added a long shackle at the bottom of my 2014 WR17 Forestay to achieve 6 degree Mast Rake. see (STAY TENSION?)
In addition to adjusting my Mast Rake to 6 degrees I also added Back Stay Adjusters to take up the slack on the back stays and increase the Mast Rake when sailing up wind. (they are lines from the center stay rings, through turn blocks on the aft aka plates, to cam cleats near the pilot seat). This provides a way to adjust Mast Rake while sailing.
THE JIB:
On a rig like the WR17, when the lee shroud goes slack when sailing, it allows the pressure in the Jib to create too much curve (draft) in the Headstay letting the max draft of the Jib creep aft . By tightening the lee shroud you are actually tightening the Headstay, making it straighter, and flattening the Jib, letting the boat point higher and probably faster upwind. On a broad reach to a run it is ok to leave the curve in the Headstay as the draft needs to be aft and fuller for downwind optimum.
HOW:
My port and starboard back stay adjusters are composed of:
. a turn block with becket mounted on the rear aka plates
. a simple turn block attached to the center shroud ring
. a cam cleat mounted near the pilot seat
. a line running from the becket on the aka plate turn block -
to the turn block at the center of the shrouds -
back down to the aka plate turn block -
over to a cam cleat near the pilot seat
COMPONENTS:
2ea turn blocks with beckets
2ea turn blocks with out beckets
2ea cam cleats
rope of appropriat size
NOTE:
This arrangement provides a mechanical advantage of 2 (on port and starboard sides).
Without loosening the Forestay the Mast Rake does not increase much more than 1 degree.
The Forestay tension increases considerably.
The Back Stay Adjuster modification is easy to install, and does not increase set-up time.
TAKE A LOOK:
Back Stay Adjusters slide show
THE MAST:
According to (SAIL POWER the complete guide to sails and sail handling) Pg. 143:
Increased Mast Rake increases windward helm and improves sailing to windward (reaching or pointing). Decreased Mast Rake increases lee helm and improves sailing down wind (running).
A WR17 poll indicated that a 6 degree Mast Rake is desirable. So I added a long shackle at the bottom of my 2014 WR17 Forestay to achieve 6 degree Mast Rake. see (STAY TENSION?)
In addition to adjusting my Mast Rake to 6 degrees I also added Back Stay Adjusters to take up the slack on the back stays and increase the Mast Rake when sailing up wind. (they are lines from the center stay rings, through turn blocks on the aft aka plates, to cam cleats near the pilot seat). This provides a way to adjust Mast Rake while sailing.
THE JIB:
On a rig like the WR17, when the lee shroud goes slack when sailing, it allows the pressure in the Jib to create too much curve (draft) in the Headstay letting the max draft of the Jib creep aft . By tightening the lee shroud you are actually tightening the Headstay, making it straighter, and flattening the Jib, letting the boat point higher and probably faster upwind. On a broad reach to a run it is ok to leave the curve in the Headstay as the draft needs to be aft and fuller for downwind optimum.
HOW:
My port and starboard back stay adjusters are composed of:
. a turn block with becket mounted on the rear aka plates
. a simple turn block attached to the center shroud ring
. a cam cleat mounted near the pilot seat
. a line running from the becket on the aka plate turn block -
to the turn block at the center of the shrouds -
back down to the aka plate turn block -
over to a cam cleat near the pilot seat
COMPONENTS:
2ea turn blocks with beckets
2ea turn blocks with out beckets
2ea cam cleats
rope of appropriat size
NOTE:
This arrangement provides a mechanical advantage of 2 (on port and starboard sides).
Without loosening the Forestay the Mast Rake does not increase much more than 1 degree.
The Forestay tension increases considerably.
The Back Stay Adjuster modification is easy to install, and does not increase set-up time.
TAKE A LOOK:
Back Stay Adjusters slide show