Abstract-this paper discusses the modeling of a ducted-fan flying bike for defense surveying and spying purpose. it is a compact aerial vehicle with a ducted fan configuration which can able to survey and spy the surroundings and also a simple design is used for commercial purposes like a motor bike. it does not allows our soldier to direct interference of unknown areas of danger. it can have a capacity of single or double seated system. it consists of a co-axial type propeller mounted on a hi speed brushless electric motor or for commercial purposes we can also use motor bike engines. it was powered by a lithium phosphate fuel cells or hydrogen oxygen fuel cells . thrust vectoring can be done by a special design and technique so that it can able to fly at almost in all directions. it is designed with a ducted fan so that the slip of air is less. hence its aerodynamic efficiency is high. moreover it can able to take off and land vertically from any terrain. it does not need any runway. overall the basic flying bike costs only 3 lakh rupee. moreover the bike is powered by hydrogen oxygen fuel cells, which can be environment friendly. since it uses electricity it is non polluting environment friendly bike. in case of hydrogen-oxygen fuel cells the emitted product is only water. key words: ducted-fan , mass piloting system .vtol systems, swash plate, pilot seat controllable actuators, whirl motion, pendulum action.