Flying cars have been developed as next generation vehicles that enable high speed and flexible door-to-door transportations. A short take-off distance is expected to contribute to increase the possibility that flying cars will be used in our daily life. The purpose of the present study is to investigate to shorten a take-off distance of a flying car by using a wheels' driving force, propeller thrust and lift of main wings. This paper shows that accelerating the car by using wheels is efficient when the velocity is low. On the other hand, using propellers is more efficient when the car approaches to the take-off velocity. As a practical way to shorten the take-off distance, we propose a law to determine the power consumed by propellers and wheels as a function of the velocity of the flying car. Computation results show that the performance of the take-off phase of the flying car can be improved by using a high running ability of the car with wheels.
