SEATTLE Sailing Club Fearful Symmetry J 80, Быстрый старт, Страница: 18 / 34

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Main sail Controls and Sail Trim explained by J-80 Tuning Guide:
Back stay
Trimming of the backstay is the key to boat speed in all winds. In light winds a light pull in the
backstay lets the draft in the mainsail sit at around 50%, in medium winds the forestay is
straightened with the help of a medium pull on the backstay and in hard wind a flat mainsail is
achieved by fully trimming the backstay hard. Make reference marks on one of the backstay
split wires so that trim is repeatable over different wind strengths.
Mainsheet
The most dynamic and important trim function on a J/80. (See below)
Outhaul
With the outhaul eased the lower sections of the mainsail are very full. The outhaul is used to
flatten these lower sections when beating. Like all boats in full power conditions the outhaul
should be eased slightly and with increasing breeze the lower sections should be continuously
flattened.
Cunningham
The cunningham is used in winds over 12 knots to move the draft on the mainsail forward at
the same time flattening out the sail. The foredeck crew adjusts the cunningham with the use
of a 3:1 purchase.
Kicker (Boom vang)
The kicker is used to adjust the mainsails twist on runs.
Jib Sheet
A window in the luff of the mainsail enables the jib trimmer to see the leach of the jib in relation
to the lower spreader.
Halyard tension
Just like the mainsail the jibs depth and draft position is controlled by the jib halyard.
Mainsail Trim
In really light winds, between 0 and 2 knots , the mainsail should be trimmed so that the
leech is as open as possible. The traveler should be trimmed 30 centimeters to windward of
the centerline and the mainsheet should be eased so that the end of the boom sits 20
centimeters to lee of centerline. The outhaul is eased 4-5 centimeters from the black line.
Backstay, Cunningham and kicker are completely loose.
When the wind increases to
6 knots,
sheet the mainsail harder so that the boom nears the
centerline of the boat. The top telltale should just start to flick back behind the leech, the mid
telltale should be free flying. The backstay should be tightened slightly so that draft is placed at
around 50%. With 8 knots the mainsheet is tightened even more and the traveler is eased
down to about 20 centimeters to windward of the centerline. The mainsheet can now be
tightened slightly more but not so much as for the top telltale to stand behind the sale for more
than 20 % of the time. The boom should now be on the boats centerline. The outhaul is now 20
millimeters from the black band. The cunningham should still be loose.
Bend with light backstay @ 8 knots20 knots