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
And the Ship Sails On of cultures, both ethnic and artistic, where aristocrats and snobs joyfully share the stage (the ship’s deck) with peasants and vibrant Serbian folklore. But the revels end when the menacing flagship of the Austro-Hungarian fleet sails into view, demanding the return of the Serbian refugees. The captain agrees on condition that Edmea Tetua’s ashes be dispersed at Erimo beforehand. After the ceremony, the refugees are loaded into a lifeboat for delivery to the Austrians but a young Serbian hurls a bomb at the flagship, causing pandemonium. The Austrians respond by cannon fire. The "Gloria N." sinks while Albertini wields his