🚧 Parking Barrier Boom: Counterweight, Spring Torque and Motor Sizing (2D side view)

Side view of a parking barrier boom on its pivot. Set the boom length and mass, the counterweight and its arm, the assist spring and the motor torque limit, then watch the boom follow an opening profile. The gravity, spring and inertia torques, the equilibrium angle with the motor off and the peak motor torque are computed. A mechanism companion to the 3D barrier, with four in-page numerical checks.