US 12,454,917 B2
Gas turbine engine
Pascal Dunning, Derby (GB); Roderick M. Townes, Derby (GB); and Michael J. Whittle, Derby (GB)
Assigned to ROLLS-ROYCE plc, London (GB)
Filed by ROLLS-ROYCE plc, London (GB)
Filed on Sep. 5, 2024, as Appl. No. 18/825,435.
Application 18/825,435 is a continuation of application No. 18/137,123, filed on Apr. 20, 2023, granted, now 12,110,830.
Application 18/137,123 is a continuation of application No. 17/209,989, filed on Mar. 23, 2021, granted, now 11,668,246, issued on Jun. 6, 2023.
Application 17/209,989 is a continuation of application No. 16/411,341, filed on May 14, 2019, granted, now 10,989,112, issued on Apr. 27, 2021.
Claims priority of application No. 1813082 (GB), filed on Aug. 10, 2018.
Prior Publication US 2024/0426251 A1, Dec. 26, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. F02C 7/36 (2006.01); F01D 5/28 (2006.01); F01D 5/30 (2006.01); F02C 3/073 (2006.01)
CPC F02C 7/36 (2013.01) [F01D 5/284 (2013.01); F01D 5/3084 (2013.01); F02C 3/073 (2013.01); F05D 2240/12 (2013.01); F05D 2240/30 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A gas turbine engine for an aircraft comprising:
an engine core comprising:
a first turbine, a first compressor, and a first core shaft connecting the first turbine to the first compressor;
a second turbine, a second compressor, and a second core shaft connecting the second turbine to the second compressor, the second turbine, second compressor, and second core shaft being arranged to rotate at a higher rotational speed than the first core shaft; the gas turbine engine further comprising:
a fan comprising a plurality of fan blades; and
a gearbox that receives an input from the first core shaft and outputs drive to the fan so as to drive the fan at a lower rotational speed than the first core shaft, wherein:
the total mass of the turbine, which includes the first turbine and the second turbine, is no greater than 17% of the total dry mass of the gas turbine engine, and a bypass ratio of the gas turbine engine at cruise conditions is in an inclusive range of from 12.5 to 16.