A trapdoor mechanism and method of providing a trapdoor mechanism for initiating descent into a slide ride is disclosed. Aspects of invention are directed to an energy efficient mechanism capable of dropping slide riders into the entrance of a slide ride. The trapdoor mechanism utilizes momentum produced by the force of gravity to swing the trapdoor to an open position, to a closed position, and back to the open position. A control device may be utilized to apply force to the trapdoor during its transit between the open position and closed position.