Turbofan engine comprising a set of rotatable blades for blocking off the bypass flow duct

A turbofan engine comprising:

• a motor, and
• a nacelle surrounding the motor,
• wherein a duct in which a bypass flow flows is delimited between the nacelle and the motor,
• said nacelle comprising a plurality of blades, each blade being mounted mobile in rotation between a stowed position in which the blade is not in the duct and a deployed position in which the blade is across the duct,
• each blade comprising a rigid core having a first end that is mounted mobile in rotation and a second, free end, and
• a sheath comprising a first part which surrounds at least one part of the core and the second free end, and an aileron which extends beyond the core facing the first part of an adjacent blade,
• the sheath being made of a flexible material such that, in the deployed position, the bypass flow causes the aileron to come into contact with the first part of the adjacent blade.