Abstract
Recently, quad rotor helicopter (QRH) is used for multiple uses such like aerial photographing and investigation at disaster site. Also QRH is the easy operationable UAV because of its structure. But, if one of the rotors is broken, QRH will fall dawn soonly. The methods to avoid falling down are emergency parachute, to increase rotors, etc. But these methods will raise cost and weight. Biblioglaphy[1] shows emergency landing control of QRH with image processing using embedded camera on the airframe. In this study, we propose a new emergency landing control of QRH with one broken rotor. The new method is to realize emergency landing control by controlling the rotational speed of diagonal rotor of damaged rotor.
