The invention discloses an extendable type
tail apron mechanism, and belongs to the technical field of aircrafts. The problems that when an existing guided
missile or
rocket carries out high-speed flying, along with Mach number increasing, the stability of the guided
missile or
rocket is poor are solved. The mechanism comprises a round inner frame body, a round outer frame body, an abut-joint
flange, multiple power driving devices, multiple pairs of long rods, multiple short rods, multiple inner apron pieces, multiple outer apron pieces and multiple locking devices; multiple linear guide railsare evenly distributed on the outer circumference of the round inner frame body, the sliding blocks are evenly distributed on the inner circumference of the round outer frame body, each sliding blockand each linear guide rail are matched, through driving of the power driving devices, the round inner frame body moves along the axis of the round outer frame body, the abut-joint
flange is fixedly connected to the round inner frame body and is arranged in a concentric manner, the inner apron pieces and the outer apron pieces are hinged to the abut-joint
flange, and are spaced to form a
tail apron, and the mechanism is suitable for hypersonic vehicles.