Turboprop provided with a blade-positioning device

A turboprop provided with at least one blade positioning device, comprising:

• a stationary nacelle,
• at least one rotary nacelle comprising a plurality of blade roots,
• a turbine, said stationary and rotary nacelles and said turbine being coaxial along a longitudinal axis,
• said blade positioning device comprising for each blade a movement transformation device constructed and arranged to transform a translation movement into a rotation movement, each movement transformation device being secured to said rotary nacelle and being adapted to pivot a blade,
• wherein said positioning device is placed between an inner surface of said stationary nacelle and an outer surface of said turbine, said positioning device comprising a member including a body secured to said stationary nacelle and a rod configured to slide along an axis substantially parallel to said longitudinal axis, and
• wherein said movement transformation device comprises:
• a ring extending along the longitudinal axis,
• for each blade:
• toothed rack being connected fixedly to said ring, said toothed rack being essentially parallel to said longitudinal axis,
• a bevel gearwheel that is coaxial with a predetermined blade root and located at the base of said blade root,
• a pinion having an axis of rotation that is perpendicular to a perpendicular axis of said longitudinal axis, comprising:
• a first gearwheel configured to cooperate with said toothed rack,
• a second bevel gearwheel configured to cooperate with said bevel gearwheel.

A turboprop comprising:

• a first nacelle;
• a second nacelle that is configured to rotate relative to the first nacelle, the second nacelle comprising a plurality of blade roots;
• a turbine, said first and second nacelles and said turbine being coaxial along a longitudinal axis;
• and
• a blade positioning device arranged between an inner surface of said first nacelle and an outer surface of said turbine, the blade positioning device comprising for each blade a movement transformation device constructed and arranged to transform a translation movement into a rotation movement, the movement transformation device being secured to said second nacelle and being adapted to pivot the blade, and a member including a body secured to said first nacelle and a rod configured to slide along an axis substantially parallel to said longitudinal axis,
• wherein said movement transformation device comprises
• a ring extending along the longitudinal axis,
• a linkage extending essentially parallel to said longitudinal axis, said linkage being connected to a blade root and comprising a finger located at a first end and a finger located at a second end thereof, said fingers being disposed perpendicularly relative to the longitudinal axis,
• said finger located on the first end being configured to cooperate with said ring to such effect that when said ring undergoes a translation movement, said linkage undergoes a translation movement,
• said finger located on the second end being offset relative to a central axis of said blade root and being configured to cooperate with said blade root to such effect that when said linkage undergoes a translation movement, said blade root undergoes a rotation movement.