A drive for imparting rotation about an axis includes an axial flux motor having a stator and a rotor, an output drive element, an epicyclic gear system located between the rotor of the axial flux motor and the drive element. Metering of the liquid propellant is accomplished in a manner that is not sensitive to changes in ambient temperatures. In one instance, the present invention includes a rotor having a plurality of outwardly extending blades positioned in communication with a magneto-rheological fluid. If the energy accumulator is not used, the diode is also blocked by increasing the voltage of the intermediate circuit with the aid of the voltage on the energy accumulator. When a wood piece reaches a point in the production process where a decision is required, its unique identity is used to retrieve appropriate information previously determined and assigned to the wood piece. The water supply may be electrically controlled by solenoid valves and has a float overflow shutoff control in some embodiments.