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
North Sails the company into the world's dominant sailmaker with roughly 80% marketshare. North Sails is an example of a vertically integrated company, with its North Cloth division producing woven and laminated sailcloth. North Sails is part of North Technology Group, a conglomerate of marine-industry companies that includes Southern Spars and EdgeWater Powerboats. Being closely associated with Southern Spars, a manufacturer of carbon fiber masts, allows North Sails to engineer an integrated spar and sail package. In 2014, Oakley Capital Private Equity, a UK private equity firm founded by Peter Dubens acquired a majority stake in North Technology Group. North Sails introduced