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
Scarlet Sails (film) sets about to make it come true. This was the film debut of Anastasiya Vertinskaya, who celebrated her 16th birthday during the filming. She went on to star in such Soviet classics as "The Amphibian Man" and "Hamlet". Locations used in the filming include Koktebel and Yalta in Crimea (Russia), Baku in Azerbaijan, and Pitsunda in Abkhazia. Grey's ship "Secret" was actually the training ship "Alfa" from the Rostov Naval School. It was outfitted with 2,500 meters of scarlet parachute silk procured to satisfy Ptushko's demand for authenticity. Scarlet Sails (film) Scarlet Sails () is a 1961 Soviet film produced