Aircraft fabric covering often used in the restoration of older types that were originally covered using traditional methods. The purposes of the fabric covering of an aircraft are: Pioneering aviators such as George Cayley and Otto Lilienthal used cotton-covered flying surfaces for their manned glider designs. The Wright brothers also used cotton to cover their Wright Flyer. Other early aircraft used a variety of fabrics, silk and linen being commonly used. Some early aircraft, such as A.V. Roe's first machines, even used paper as a covering material. Until the development of cellulose based dope in 1911 a variety of methods of finishing the
Marko (fabric) contact with flames and at least one type of heat. Heat contact may take the form of convective, radiant or contact heat, an electric arc, splashes of molten metal, or certain combinations of these types. Marko fabrics must also comply with other standards and are therefore tested for tear resistance, tear strength, burst strength and seam strength. The Marko trademark was later applied to new designs that were developed to address specific risks in the workplace. These include: Marko (fabric) Marko (UNE EN 11612) is a registered trademark for a group of flame retardant fabrics used in the manufacture of