As illustrate in fig. 2, when the weight is at the top of the vertical axis during 1st 360 degree rotation the starting
velocity of the first shaft is zero. The weight fixed on the flywheel fall in a downward direction and starts to generate
the velocity due to gravitational force acting on it; the energy generated during its half downward 180 degree rotation is
stored in the flywheel such that the weight is capable to complete its next half upward rotation without any external
energy input. But at the top energy in the flywheel becomes zero.