 The RB.106 project was cancelled in March 1957, at a reported total cost of £100,000.The RB.106 was a two-shaft design with two axial flow compressors each driven by its own single stage turbine and reheat.It was of similar size to the Rolls-Royce Avon, allowing it to be used as a drop-in replacement, but it would have produced about twice the thrust (with reheat) at 21,750 lbf (96.7 kN).