Airground aircraft duct propeller shaft selectable aerodynamic performance type fixed connection structure

The invention discloses a selectable aerodynamic performance type fixed connection structure for a ducted propeller shaft of an air-ground aircraft. The fixed connection structure comprises a central main shaft, at least one first rotor wing, at least one second rotor wing, at least one third rotor wing, first ducts in one-to-one correspondence with the first rotor wings, second ducts in one-to-one correspondence with the second rotor wings and third ducts in one-to-one correspondence with the third rotor wings, the first rotor wing is fixedly mounted on the central main shaft; the peripheral side of the first rotor wing is sleeved with a first duct; the second rotor is hollowly sleeved on the central main shaft; a second blade of the second rotor is fixedly connected with the second duct; and the third rotor wing is fixedly connected between the central main shaft and the third duct. According to the fixed connection structure, the ducts and the rotor wings are respectively equivalent to the pump wheel, the