This example shows a variable ratio gear coupling two inertias (shafts). The gear ratio between the follower (F) and the base (B) is steadily increased from 1:1 to 2:1. The ratio of the follower to base angular speed decreases with gear ratio, and conversely the ratio of the follower to base torque increases with gear ratio. The variable gear is implemented using the Variable Ratio Transmission block. This block has some compliance, and it is important that its stiffness reflect the torque level to be transmitted. Similarly, the transmission damping must be set to be consistent with the stiffness and the inertia seen across the transmission. Too little damping results in unphysical lightly-damped oscillations that require small simulation time steps.