Skyscraper

According to W.H. Smythe’s Sailor’s Word Book, Skyscraper sails were triangular sails set above the square Skysails, which were themselves set above the main sails. On the journey homeward Scoresby describes erecting royal masts above the main masts to accommodate more sail, since the Resolution needed to return home as quickly as possible.

Where the royal masts were tall enough, such as on a clipper ship, a further square sail, known as a Moonraker or Moonsail, could be added above the Skysail.