Rudder assist mechanisms and methods are capable of being operably connected to an aircraft’s rudder control system. Direct user input to the follower browsers is blocked. The block-out short-wave sensor is coupled through a wire transmission line to an electronic console of the exercise apparatus such that an actual detection message obtained by the block-out short-wave sensor may conduct a pre-determined action by use of a built-in microprocessor. The top side includes a transverse hinge forming a first adjustable section and a second adjustable section. Differently configured cubic products may be handled by the storage and retrieval unit in an easy, fast and reliable manner.