1. Halyard and Cunningham
Hoist sail until horizontal creases disappear. The Cunningham, if present will be hardened subsequently. To much tension can damage the sail. In case of vertical creases, the Cunningham must be eased correspondingly.
A Cunningham facilitates the hoisting of the sails since it requires less force to pull down than with the main halyard. Without Cunningham it is frequently necessary to hoist several times; I.e. Ease, Luff, Hoist until the luff is straight.
N.B. A halyard of bad quality (stretching) makes this unnecessarily difficult.
2. Foot of the sail
Trimming of the foot is less important for cruisers. With light wind the foot can be eased increase the sag of the sail.
3. Sail and downhaul (VANG)
Sail and downhaul determine the twist of the leech. With the boom in the centreline of the boat it is possible to control the tension of the sail exclusively by hardening the mainsheet. As soon as the wind increases and on a beam reach course the boom is unloaded and it becomes necessary to harden the downhaul to control the tension of the sail and consequently the twist of the leech. Since the wind speed changes over the height of the sail, the twist is necessary to obtain the optimal trim of the sail over its entire height.
4. Mainsheet Traveller
With the traveller it is possible to maintain the vertical tension on the sail when the boom is of axis. With light wind the sail can be trimmed with more sag by easing the mainsheet. The boom is then kept in the axis of the ship by moving the traveller to windward. With increasing wind the traveller can be moved to lee in order to reduce the pressure on the rudder and the heeling of the boat. When the sail starts to back behind the mast it is time to think about a reef.
When the trim of the mainsail is correct, it is necessary to tension the leech in order to prevent it from fluttering. Too much tension on the leech reduces however the speed of the boat. The leech can be eased again when the wind speed reduces
N.B. The backstay tension affects headsail and mainsail.