A tiltrotor aircraft having rotary and non rotary flight modes, the aircraft comprising: a mast; a rotor assembly having a gimballing degree of freedom relative to the mast, the rotor assembly including a plurality of rotor blade assemblies each having a pitching degree of freedom and a folding degree of freedom; a gimbal lock positioned about the mast, the gimbal lock having a disengaged position relative to the rotor assembly, enabling the gimballing degree of freedom, in the rotary flight mode and an engaged position relative to the rotor assembly, disabling the gimballing degree of freedom, in the non rotary flight mode; a blade stop assembly positioned about the mast, the blade stop assembly including a plurality of arms having a radially contracted orientation, in the rotary flight mode and a radially extended orientation, in the non rotary flight mode, each arm engaging with a cuff of one of the rotor blade assemblies upon feathering the rotor blade assemblies, to provide a positive stop for the respective rotor blade assembly when the blade stop assembly is in the radially extended orientation; a plurality of blade lock assemblies, each blade lock assembly operably associated with one of the rotor blade assemblies, each blade lock assembly having a first position, disabling the folding degree of freedom and enabling the pitching degree of freedom of the respective rotor blade assembly, in the rotary flight mode and a second position, enabling the folding degree of freedom and disabling the pitching degree of freedom of the respective rotor blade assembly, in the non rotary flight mode; and a swash plate positioned about and operable to rise and fall relative to the mast, the swash plate operable to change the pitch of the rotor blade assemblies, in the rotary flight mode and operable to fold the rotor blade assemblies, in the non rotary flight mode. a mast; a rotor assembly having a gimballing degree of freedom relative to the mast, the rotor assembly including a plurality of rotor blade assemblies each having a pitching degree of freedom and a folding degree of freedom; a gimbal lock positioned about the mast, the gimbal lock having a disengaged position relative to the rotor assembly, enabling the gimballing degree of freedom, in the rotary flight mode and an engaged position relative to the rotor assembly, disabling the gimballing degree of freedom, in the non rotary flight mode; a blade stop assembly positioned about the mast, the blade stop assembly including a plurality of arms having a radially contracted orientation, in the rotary flight mode and a radially extended orientation, in the non rotary flight mode, each arm engaging with a cuff of one of the rotor blade assemblies upon feathering the rotor blade assemblies, to provide a positive stop for the respective rotor blade assembly when the blade stop assembly is in the radially extended orientation; a plurality of blade lock assemblies, each blade lock assembly operably associated with one of the rotor blade assemblies, each blade lock assembly having a first position, disabling the folding degree of freedom and enabling the pitching degree of freedom of the respective rotor blade assembly, in the rotary flight mode and a second position, enabling the folding degree of freedom and disabling the pitching degree of freedom of the respective rotor blade assembly, in the non rotary flight mode; and a swash plate positioned about and operable to rise and fall relative to the mast, the swash plate operable to change the pitch of the rotor blade assemblies, in the rotary flight mode and operable to fold the rotor blade assemblies, in the non rotary flight mode.