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Recent downsizing and high perferming of the cQmputer enable aircrafts to fly without pilot ． Such aircrafts are called Unmalmed Aerial Vehicles ( UAVs ) ． UAVs are rr：ainly operating risky missioll which is diHicult to execute by manned aircrafts ． In particular， the aerial photogtaphy is primary mission of UAVs ． The conventional aircraft rolls when it changes direction and heading ． But ， a roll angle change causes a swing of the onboard camera and a poor reception of the GPS ． Thus ， a lateral directiQnal motion without rolling is required