A skysail is the uppermost sail in many old square-rigged sail-plans (though sometimes topped by a moonsail). It was also on the royal mast above the royal sail. It was typically used in light winds.
Image:Regina Maris moonraker and studding 2.jpg|The highest sail is moonraker, lower skysail and royal sail.
Image:Clipper (PSF).jpg|Skysail is the highest on the main (middle) mast.
Image:Regina Maris moonraker and studding 1.gif
Image:Square rig names.gif
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』