33
LAGOON 62O
RIGGING / SAILS
RIGGING
SAILS
3
3.1 Sailing
z
BEWARE
A catamaran is about 6 times more resistant to heeling than a
monohull.
In naval architecture, it is referred to as uprighting moment
(multiplication of the weight of the boat by the transversal distance
between the centre of gravity and the centre of flotation (or bottom).
See the illustration on the opposite page.
This fact has real consequences as for the sailing and sail trimming
of a catamaran.
The fact that the boat does not heel may mask overcanvassing, which
may be very dangerous for the crew and the boat. Therefore you
MUST permanently keep a close eye on the speed of the true wind,
and trim the sail surface according to the latter as a matter of priority.
The below-mentioned trims apply in a calm sea. When the sea is
brown, you shall reduce earlier by 10% as far as the speed of true
wind is concerned. And as a general rule, it is absolutely imperative to
permanently try to ease up the boat rather than to stress her.
You will always try to have the forward edges of the sails facing the
apparent wind, and to have the sail not sheeted home, so that the
airflow behind the sail may be laminar, that is to say so that it may go
off the aft part of the sail without any disruption.
In case you shouldn't follow the recommendations below, it might be
dangerous for the boat and the crew, and, in case of an accident, the
manufacturer's responsibility would not be involved.
z
TRIMMING WHEN CLOSE HAULED (between 75 and 50° of true wind)
WWiinndd ffoorrccee ggiivveenn iinn aappppaarreenntt wwiinndd
-
FFrroomm 00 ttoo 1166 kknnoottss
: Full sail ; sheet traveller 30 cm above the centre
line of the boat, mainsail sheeted with a slightly open leech (boom on
the centre line of the boat).
The genoa is trimmed so that it skims the spreader, the genoa
traveller is set so that the angle of the genoa sheet is the continuation
of a straight line that goes through the sheet clew and the luff, at 40%
of its height.
-
FFrroomm 1166 ttoo 2200 kknnoottss
: Full sail ; the sheet traveller goes up 60 cm
above the centre line of the boat, mainsail sheeted with a leech a little
more open (boom always in line : therefore you must ease off the
sheet). The genoa traveller remains at the same place but the sheet
is adjusted so that the leech is 10 cm far from the spreader.
-
FFrroomm 2200 ttoo 2266 kknno
ottss
: 1 reef, full genoa ; the sheet traveller goes
back to 30 cm above the centre line of the boat.
The genoa traveller remains at the same place but the sheet is eased
off so that the leech is 20 cm far from the spreader.
-
FFrroomm 2266 ttoo 3300 kknnoottss
: 1 reef, 75% of the genoa ; the sheet traveller
goes up 60 cm above the centre line of the boat.
The genoa traveller remains at the same place or slightly goes
forward but it is adjusted so that the leech makes a propeller shape
where the upper part let some air go off in increases of wind.
-
FFrroomm 3300 ttoo 3366 kknnoottss
: 2 reefs, staysail ; the sheet traveller is back
30 cm above the centre line of the boat, the sheet is 50 cm eased off
and the boom is leeward.
To Next Page
Loading...
