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. 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. Imag... Found on http://en.wikipedia.org/wiki/Skysail