Method and arrangement for changing the direction of travel of a reel being moved by a incoming conveyor, for transfer to the following conveyor, in which method the reel is first brought to a turntable and the direction of travel of the reel is changed by turning the turntable. During discharging operations, a plurality of discharging heads are selectively arranged about the extended path-length of metal-fuel tape so as increase the rate at which electrical power is powered from the system. A part of a 3D performance determinant is activated in the first candidate chip. The feedback stage output is connected to the first stage input and to a terminal of the core. A third controller calculates a torque fuel injection amount for generating the combustion air-fuel mixture, a post fuel injection amount for supplying unburned fuel to a DeNOx catalyst, etc.