An engine (10) for an aircraft, including an engine core (11), including a turbine (19), and,A compressor (14),Connecting the impeller to the mandrel (26) of the compressor;A blower (23) upstream of the motor core;The reducer (30) receives input from the reducer input shaft part (26a) of the mandrel (26) and drives the blower at a speed lower than the mandrel. The reducer is a planetary gear reducer (30) including a sun gear (28),A plurality of satellite gears (32),The satellite frame (34) and the reducer bracket (40) support the reducer at a fixed position. The satellite frame and the reducer bracket each have torsional stiffness, and the torsional stiffness ratio of the satellite frame and the reducer bracket [math 42]Greater than or equal to 2.3.Abstract figure: [figure 13]
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