The air vehicle propulsion system 10 wherein the outer blade row is upstream of the inner blade row in a tractor configuration and power distributed by the power shaft to {HEAD ~ the outer blade row} as controlled by {TAIL ~ the outer blade row pitch control unit} is less than power distributed to the inner blade row as controlled by the inner blade row pitch control unit with the outer blade row in an extended position 
The air vehicle propulsion system 10 wherein the outer blade row is upstream of the inner blade row in a tractor configuration and power distributed by the power shaft to { HEAD ~ the outer blade row } as controlled by { TAIL ~ the outer blade row pitch control unit } is less than power distributed to the inner blade row as controlled by the inner blade row pitch control unit with the outer blade row in an extended position
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