Forces on sails to stay within the limitations of a craft's stability and power requirements, which are functions of hull (for boats) or chassis (for land craft) design. Sails derive power from wind that varies in time and with height above the surface. In order to do so, they are designed to adjust to the wind force for various points of sail. Both their design and method for control include means to match their lift and drag capabilities to the available apparent wind, by changing surface area, angle of attack, and curvature. Wind speed increases with height above the surface; at the same
Black Sails (TV series) action dramas from experience with shows like "Spartacus" and "Camelot". And that formula is executed with particular skill in 'Black Sails,' thanks to some strong performances and an exploration of the consequences of greed that could have come out of modern-day Wall Street". Black Sails (TV series) Black Sails is an American historical adventure television series set on New Providence Island and a prequel to Robert Louis Stevenson's novel "Treasure Island". The series was created by Jonathan E. Steinberg and Robert Levine for Starz. It debuted online for free on YouTube and other various streaming platform and video on demand