Hunter Marine sailing yacht Owner'S Manual Download

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TUNING THE H420 B&R RIG

4208052.doc

PAGE 52

The easiest method for tuning the B&R rig is
to perform step one as follows before the
mast is stepped, with it lying aft side down
on two sawhorses. Begin with all rigging
slack. If the mast is already stepped, loosen
all the rigging, and then proceed to step
one.

1. Start with all the rigging slack. Then

induce the mast bend by tightening the
reverse diagonals (diamonds). Measure
the bend by tensioning a line or the main
halyard between the masthead and the
gooseneck. The maximum amount of
bend should be no more than 8

”

(203

mm)for the standard rig and no more
than 2

”

(50 mm) for the furling mast

measured perpendicular from the aft
face of the mast to the halyard at the
deepest part of the bend.  It can be less
than that based on the sail shape and
your own preference. The bend should
also be evenly distributed along the
mast to give a smooth shape. Keep in
mind that bending a furling mast may
make it more difficult to furl and will not
do much to flatten the sail as in a
standard rig. It is very important that
the mast also be straight from side to
side at this time.  Tighten or loosen the
reverse diagonals to achieve this.

2. Step the mast with all shrouds attached

but with the turnbuckles completely
loosened (if the mast was not already
stepped).

3. Attach the jib halyard to a cleat on the

bow to support the mast in a raked
position (the masthead should be about
1-1/2

’

behind the step). Attach the

verticals and tighten them until you can
just see the hole for the cotter pin in the
turnbuckle. Tighten the jib halyard until
you can attach the forestay. At this
point the masthead should be raked so
that a weight hung on the main halyard
hangs about 1

’

behind the mast step.

4. Use the main halyard to check that the

mast is centered from side to side. Pull
it tight and mark the halyard next to the
verticals chainplate. Now do the same
to the other side to see if the marks line

up.  If not, tighten and/or loosen the
verticals until the marks line up.  Once
the masthead is centered, begin
tightening the verticals until the
turnbuckles are approximately half
closed.  While tightening the verticals
you may notice the bend in the mast
increasing.  Now you can tighten the
lowers which will tend to straighten the
lower part of the mast.  Be sure to
tighten port and starboard sides evenly.

5. Now you should tighten the headstay

until it is approximately half closed as
well. This should induce the appropriate
amount of headstay tension.

Never

use

anything more than a pair of wrenches
to tighten your rigging. If you use an
extended piece of pipe on the handle of
a wrench you can over tighten the
rigging and do damage to the mast or
rigging.

6. On the Hunter H420 it is necessary to go

up the mast in a bosun

’

s chair to tighten

the number 2 diagonal shroud (D2 or
intermediate shroud). Always use
caution when

“

going aloft

”

. You should

always use a mountain climbing harness
or Bosun

’

s Chair intended for this use.

Always tie into the harness with the
halyard using a bowline and then secure
the shackle as a back up as the knot is
more reliable than a mechanical
fastener.  The person hoisting you aloft
should keep the halyard stopper closed
to prevent falls.  Good communication
between the two of you is also
important.  Tighten the D2 until it has
just become tight and then add two
complete turns.  While at the first
spreader, look up the back of the mast
to see if it is straight.(rather than bent
from side to side).  If  it is not straight
then adjust the appropriate D2 to
straighten it.

7. Have the person on deck carefully lower

you.  They should keep the halyard
wrapped at least twice around the
winch and should always have one hand
able to stop the halyard from running
free.  Once on deck look up the back of
the mast  and see if it is straight (rather