Abstract: A gas turbine engine is disclosed having a compressor, a combustion chamber downstream of the compressor, and a turbine downstream of the combustion chamber. The compressor includes a first group of compressor blade wheels and a second group of compressor blade wheels downstream of the first group of compressor blade wheels and rotating in an opposite direction such that a deviation of a performance, defined as air mass flow per second between the first group of compressor blade wheels and the second group of compressor blade wheels, is minimized, and a detachment of the air mass flow from blades of a first blade wheel of the second group of compressor blade wheels is substantially eliminated. A bypass enables the air mass flow flowing from the first group of the compressor blade wheels to substantially serve all of the second group of compressor blade wheels substantially simultaneously.

Abstract: The invention is directed to a gas turbine engine comprising a compressor, a combustion chamber, and a turbine section installed one after the other in series in the direction of the air and gas flow, wherein the compressor consists of two groups of blade wheels rotating in opposite directions to each other. The deviation of the performance defined as “air mass flow per second” between both compressor groups is minimized and a detachment of the air mass flow from the blades is substantially eliminated. The blade wheels of the second compressor group, beginning at the first blade wheel, are progressively bigger to allow a bypass for the air stream coming from the first compressor group to serve all the blade wheels of the second group essentially simultaneously.

Abstract: A cable for the transmission of signals from an amplifier to a loudspeaker which includes two insulated conductors forming respective leads, and a sheath enclosing the two leads. The conductors can be solid wires having a smooth surface and made of oxygen-free copper. In the alternative, the conductors can be composed of elementary wires, the elementary wires of each conductor being stranded together in the same wire drawing direction, and the conductor composed of the stranded elementary wires being of a unilay structure, the conductor being additionally compressed.