Running – port tack: Running port side, sailing downwind. The second downward sailing on the port side, the 5 o’clock position. Sails will be let out to their maximum position with the rudder in center position.
Tactic: When sailing a straight line on the port side, let sail out nearly perpendicular to the boat for maximum speed. To jibe—turn with the wind at your back—carefully pull in sail and gently turn rudder, then slowly let sail out on opposite side. Watch for the boom to unexpectedly swing across the boat with a sudden change in wind direction.

running - port tack
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7. Running – wind from behind: A run is straight downwind. Neither port or staarboard. The wind is at a relative bearing of 6 o’clock. We want to expose as much sail area as possible. Sail trim is not critical, small adjustments don’t make much difference in our boat speed. The sails should be out all of the way. You might have noticed in the picture that the mainsail and the jib are on opposite sides while on a run. Running is the most unstable position to sail in.
Tactic: When sailing a straight line, let sail out nearly perpendicular to the boat for maximum speed. To jibe—turn with the wind at your back—carefully pull in sail and gently turn rudder, then slowly let sail out on opposite side. Watch for the boom to unexpectedly swing across the boat with a sudden change in wind direction.

running
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8. Running – starboard tack: Running starboard side, sailing downwind. With the wind coming over the starboard side, (boom on port). The second downward sailing on the starboard side, the 7 o’clock position. Sails will be let out to their maximum position with the rudder in center position.
Tactic: When sailing a straight line on the starboard side, let sail out nearly perpendicular to the boat for maximum speed. To jibe—turn with the wind at your back—carefully pull in sail and gently turn rudder, then slowly let sail out on opposite side. Watch for the boom to unexpectedly swing across the boat with a sudden change in wind direction.
https://knotalotsailing.wordpress.com/sailing-101/points-of-...
Lots of pictures and explanations too ;)

Nelle andature portanti (lasco, poppa) il vento spinge sulle vele che sono un ostacolo al suo percorso, mentre nelle andature strette (bolina) la forza propulsiva viene dal vento che incontrando le vele viene da queste deviato.
http://digilander.libero.it/miogatto/vela/andature.html

vento di poppa, aft (o stern) wind; following wind; (anche fig.) avere il (o navigare col) vento in poppa, to sail before the wind.

Lasco
B m. (naut.)
1 (imbando) slack
2 – andare al gran lasco, to sail large; to run free; to be on a free reach; andatura al gran lasco, free-reaching; running free.