Beyond about 5 stages or maybe a four:one style and design pressure ratio a compressor will never function Except fitted with options like stationary vanes with variable angles (called variable inlet guide vanes and variable stators), the opportunity to allow some air to escape component-way together the compressor (referred to http://ktp-price.de/maximale-effizienz-tipps-und-tricks-fur-die-effektive-nutzung-eines-kompressors/