Patent ID: 8191352

Claim:
A gas turbine engine counter-rotatable low pressure turbine comprising: counter-rotatable annular outer and inner drum rotors, the outer drum rotor rotatably connected to a low pressure shaft wherein the low pressure shaft is the sole shaft operable for transmitting torque and power out of the low pressure turbine, a plurality of axially spaced apart low pressure outer drum turbine blade rows extending radially inwardly from an outer shell of the outer drum rotor, the low pressure inner drum rotor including a plurality of axially spaced apart low pressure inner drum turbine blade rows extending radially outwardly from the annular low pressure inner drum rotor, the low pressure outer drum turbine blade rows being interdigitated with the low pressure inner drum turbine blade rows, and the inner drum rotor being geared through an epicyclic gearbox for transmitting torque and power produced by the inner drum rotor to the low pressure shaft.