Control of the horsepower distribution, blade row spacing and pitch by the FADEC allows optimum downstream blade row spacing for maximum swirl recovery and {HEAD ~ efficiency} varying with {TAIL ~ upstream rotor shaft horsepower} and forward airspeed 
varying with
Control of the horsepower distribution , blade row spacing and pitch by the FADEC allows optimum downstream blade row spacing for maximum swirl recovery and { HEAD ~ efficiency } varying with { TAIL ~ upstream rotor shaft horsepower } and forward airspeed
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH