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
Red Sails in the Sunset (album) 10th birthday, which was simulcast on ABC Television and subsequently re-broadcast on their then-Tuesday night music program "Rock Arena". In 2004 the film footage later became part of a DVD album, "Best of Both Worlds". "Red Sails in the Sunset" contains the only Midnight Oil tracks with lead vocals provided by their drummer Rob Hirst, "When the Generals Talk" and "Kosciusko". The album spawned two singles, "When the Generals Talk" and "Best of Both Worlds" but neither appeared on the Australian singles chart. Midnight Oil released "Red Sails in the Sunset" in October 1984. It was recorded in June to