Electro hydro dynamic (EHD) and electrostatic propulsion devices has no moving parts and, in the air, operates on electrical energy. It is expected to develop electric propulsion systems without future moving parts of airplanes and helicopters propellers in the future. EHD devices levitating in the direction opposite to the direction of gravity when a high voltage is applied. Detail property of the accurate propulsion direction, speed, and acceleration were clarified by imaging analysis in this time. It has been cleared from the analysis that even if the orientation of the device is initially tilted from a horizontal line, it was enforced to levitate vertically upward in the same direction as the direction of gravity, and a restoring force acts to return the orientation to a horizontal line during the levitation. These phenomena are very strange and different from drones with propellers. When the device levitates, the acceleration does not become constant immediately after the voltage is applied, but after passing through 0, it increases linearly in temporal duration of sub 0.1 s and saturates. The saturation of the acceleration changed with the input voltage.