A gas turbine engine having, in operation, greater than or equal to 17,000 lbs (75.62 kN) of thrust and less than or equal to about 26,000 lbs (115.65 kN) of thrust, comprising: a fan rotor having a hub and a plurality of fan blades extending radially outwardly of said hub; a compressor positioned downstream of the fan rotor, the compressor having a first compressor blade row defined along a rotational axis of said fan rotor; and a gear reduction positioned axially between said first compressor blade row and said fan rotor, said gear reduction including a ring gear and a carrier, said carrier having an axial length (L 1) and said ring gear having an outer diameter (D 1), wherein said gear reduction is connected to drive said hub to rotate, and a gear ratio of said gear reduction is greater than or equal to 3.0, wherein: a volume is defined for said carrier and said ring gear, and said volume being designed to be greater than or equal to 899 inches 3 (14732 cm 3) and less than or equal to 1349 inches 3 (22106.15 cm 3); the hub has a radius (r 1) defined at an inlet point of said hub, said fan blades have a radius (r 2), and a ratio of said hub radius (r 1) to said fan blade radius (r 2) is less than or equal to 0.36; said ratio of said hub radius (r 1) to said fan blade radius (r 2) is greater than or equal to 0.24; a bypass ratio, defined as a volume of air delivered by said fan rotor into a bypass duct compared to the volume of air delivered into said compressor, is greater than or equal to 12.0; and an inlet into said compressor extends radially, inwardly along a surface from a radially outermost point to a point leading into said first compressor blade row, said gear reduction is positioned between said radially outermost point and said point leading into said first compressor blade row, and said point leading into said first compressor blade row is radially inward of said ring gear; characterised in that: a ratio of said axial length (L 1) to said out diameter (D 1) is greater than or equal to 0.20 and less than or equal to 0.40. a fan rotor having a hub and a plurality of fan blades extending radially outwardly of said hub; a compressor positioned downstream of the fan rotor, the compressor having a first compressor blade row defined along a rotational axis of said fan rotor; and a gear reduction positioned axially between said first compressor blade row and said fan rotor, said gear reduction including a ring gear and a carrier, said carrier having an axial length (L 1) and said ring gear having an outer diameter (D 1), wherein said gear reduction is connected to drive said hub to rotate, and a gear ratio of said gear reduction is greater than or equal to 3.0, wherein: a volume is defined for said carrier and said ring gear, and said volume being designed to be greater than or equal to 899 inches 3 (14732 cm 3) and less than or equal to 1349 inches 3 (22106.15 cm 3); the hub has a radius (r 1) defined at an inlet point of said hub, said fan blades have a radius (r 2), and a ratio of said hub radius (r 1) to said fan blade radius (r 2) is less than or equal to 0.36; said ratio of said hub radius (r 1) to said fan blade radius (r 2) is greater than or equal to 0.24; a bypass ratio, defined as a volume of air delivered by said fan rotor into a bypass duct compared to the volume of air delivered into said compressor, is greater than or equal to 12.0; and an inlet into said compressor extends radially, inwardly along a surface from a radially outermost point to a point leading into said first compressor blade row, said gear reduction is positioned between said radially outermost point and said point leading into said first compressor blade row, and said point leading into said first compressor blade row is radially inward of said ring gear; characterised in that: a ratio of said axial length (L 1) to said out diameter (D 1) is greater than or equal to 0.20 and less than or equal to 0.40. a volume is defined for said carrier and said ring gear, and said volume being designed to be greater than or equal to 899 inches 3 (14732 cm 3) and less than or equal to 1349 inches 3 (22106.15 cm 3); the hub has a radius (r 1) defined at an inlet point of said hub, said fan blades have a radius (r 2), and a ratio of said hub radius (r 1) to said fan blade radius (r 2) is less than or equal to 0.36; said ratio of said hub radius (r 1) to said fan blade radius (r 2) is greater than or equal to 0.24; a bypass ratio, defined as a volume of air delivered by said fan rotor into a bypass duct compared to the volume of air delivered into said compressor, is greater than or equal to 12.0; and an inlet into said compressor extends radially, inwardly along a surface from a radially outermost point to a point leading into said first compressor blade row, said gear reduction is positioned between said radially outermost point and said point leading into said first compressor blade row, and said point leading into said first compressor blade row is radially inward of said ring gear; characterised in that: a ratio of said axial length (L 1) to said out diameter (D 1) is greater than or equal to 0.20 and less than or equal to 0.40.