Abstract: An unmanned aircraft 1 according to an embodiment of the present invention provides an unmanned aircraft that properly makes a forced landing in case of an abnormality. The unmanned aircraft 1 is configured as a multicopter that flies with lift and thrust generated by rotation of six rotors 13. The unmanned aircraft 1 identifies a forced landing site in a case of having detected an abnormality during flight and controls motors 12 configured to drive the respective rotors 13, to make a landing at the identified forced landing site. The unmanned aircraft 1 is consequently enabled to make an autonomous forced landing at a specific site in case of an abnormality.

Abstract: An unmanned aircraft 1 according to an embodiment of the present invention provides an unmanned aircraft that properly makes a forced landing in case of an abnormality. The unmanned aircraft 1 is configured as a multicopter that flies with lift and thrust generated by rotation of six rotors 13. The unmanned aircraft 1 identifies a forced landing site in a case of having detected an abnormality during flight and controls motors 12 configured to drive the respective rotors 13, to make a landing at the identified forced landing site. The unmanned aircraft 1 is consequently enabled to make an autonomous forced landing at a specific site in case of an abnormality.

Abstract: This invention relates to a method of controlling the temperature of a heating furnace which has at least one furnace zone capable of being controlled by heating means and which conveys materials to be heated, that are introduced thereinto, by conveyor means such as a walking beam or a pusher so that the materials are heated to a predetermined temperature until they are withdrawn from the discharge side.More specifically, the present invention relates to a method of controlling set furnace zone temperature of the heating furnace when the materials to be heated, that are introduced into the heating furnace, have different temperature elevation patterns. The method of the invention is specifically characterized in that the predetermined set temperatures of each zone is used when the temperature elevation patterns of slabs are different with each other.