PURPOSE: A glider using dynamic force by an elastic string is provided, which makes rotation ratio different according to the diameter of a pulley using a structure of belt and pulley. CONSTITUTION: A glider using dynamic force by an elastic string comprises: a fuselage(110) forming the body; an anterior wing(120) equipped in the central part of the fuselage; a propeller(130) which is equipped in the front of the fuselage in order to be rotated; an elastic body(140) for driving the propeller; a rotation pulley(151) equipped in a rotary shaft(150); a power transmission pulley(161) equipped in the power transmission shaft; and a belt(170) wound on the rotation pulley and power transmission pulley.
