Over and above about 5 stages or a 4:one style and design strain ratio a compressor will not perform unless equipped with characteristics like stationary vanes with variable angles (called variable inlet guideline vanes and variable stators), the chance to let some air to escape part-way alongside the compressor (often http://ktp-price.de/maximale-effizienz-tipps-und-tricks-fur-die-effektive-nutzung-eines-kompressors/