Patent ID: 11970982
Assignee: RTX CORPORATION
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F  Y | IPC F

Claim 18:
19. The gas turbine engine as recited in claim 18, further comprising a low corrected fan tip speed of less than 1150 feet/second, and wherein:
each of the sun gear, the plurality of intermediate gears, and the ring gear is a respective one of the double helical gears;
the helix angle is between 30 degrees and 35 degrees;
the second turbine includes two stages, the first turbine includes a greater number of stages than the second turbine, and the first compressor includes three stages; and
the first turbine includes an inlet, an outlet and a pressure ratio of greater than 5, the pressure ratio being pressure measured prior to the inlet as related to pressure at the outlet prior to an exhaust nozzle.