Wing on wing

Wing on wing designates a sail position in boats with sloop rigging, running "downwind", when the jib is held out by a spinnaker pole to catch more wind on the opposite side of the main sail.^[1]

Wing on a wing sailing

Goosewing sailing downwind

Is a term used to define in fore-and-aft-rigged sailboat, when sailing directly away from the wind, with the sails set on opposite sides of the vessel with its foresail and mainsail opened to a 180-degree angle (e.g. with the mainsail to port and the jib to starboard) so as to maximize the amount of canvas exposed to the wind.^[2]

The position of the boom is decisive for the avoidance rules . If possible, the main boom will therefore be left on the port side - otherwise every other sailing ship has to be avoided

The English term "´Goosewing" is also common for this sail position.