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5.17.1
(continued)
windward side, for further corrections. After a few tacks, the mast should be
straight: Secure the rigging by in serting cotterkeys into the turnbuckles, spread
them open and cover with tape to prevent any snags:
Special attention should be given to the initial stretch of the rigging,
especially after the first sail in a strong breeze. In windy conditions it is
actually desirable to have the mast head "fall-off" slightly to leeward, giving
the mast a smooth, even curve from head to deck. In a tall rig the
intermediates play an important part in controlling the upper mast section and
this will be especially noticeable in stronger wind conditions. After a few
more sails in strong breezes, the rigging should be checked again for tune, as
additional stretch will occur.
5.17.2
Backstays
When racing, the backstay may be tightened to compensate for extra forward
loading applied by the Genoa. At the conculsion of the race it is very important
to "slack-off" the amount you "took-up" on the backstay turnbuckle, as this
avoids setting up unnecessary strains on the hull and rig. Since you want to keep
the mast straight while racing, you will probably tighten up on the jib stay
first so when the backstay is slacked off the mast head will hook slightly
forward. When the backstay is tightened up, this "hook" will disappear and the
mast will be straight.
Too much tension on the backstay is probably the prime reason for mast and
rigging failure. It has been found that tension in the backstay can increase
1608 to 2008 due to the wind load on the headsail and dynamic loading due to
heavy seas. With the optional hydraulic type adjusters tension can easily be
applied far beyond that which is necessary or safe. The tension on a shroud oz
stay should not exceed 258 to 308 of the cable's breaking strength at the
outside limit. Below are the breaking strengths, in pounds, for 1 x 19
stainless steel wire cable as supplied by the factory.
3/32"
= 1,200
1/8"
= 2,100
5/32" = 3,300
3/16" = 4,700
7/32" = 6,300
1/4"
= 8,200
SECTION 6
Page 33
9/32" = 10,300
5/16" = 12,500__
3/8"
= 17,500
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