The original engine contained a single stage fan driven by a 4-stage low pressure (LP) turbine, supercharging a 14-stage HP compressor driven by a 2-stage high pressure (HP) turbine, with an annular combustor.
The original engine featured a single-stage axial fan powered by a 4-stage low-pressure turbine, boosting a 14-stage high-pressure compressor driven by a 2-stage high-pressure turbine with an annular combustion chamber.