A collapsible flying device, comprising: a housing, comprising: a first housing section; and a second housing section forming an enclosure with the first housing section; and a motorized assembly comprising: a drive motor arrangement that includes at least one drive motor; a drive shaft driven by the drive motor arrangement, the drive shaft matingly receiving the first housing section and being coupled to the second housing section, wherein operation of the drive motor arrangement drives the drive shaft to move the first housing section from a closed position adjacent the second housing section to an open position spaced from the second housing section; a rotor hub rotatingly driven by the drive motor arrangement; and at least two rotor blades coupled to the rotor hub and positioned within the enclosure in a collapsed position when the first housing section is in the closed position, the at least two rotor blades extending beyond the enclosure in an expanded position when the first housing section is in the open position, the at least two rotor blades being rotated by the drive motor arrangement to provide lift to the collapsible flying device; characterised in that the device further comprises a housing rotation restriction structure coupled to the first housing section and the second housing section and inhibiting rotation of the first housing section relative to the second housing section about a rotation axis of the drive shaft, wherein the drive shaft has a threaded section and the first housing section has a complementary threaded section such that rotation of the drive shaft moves the first housing section relative to the second housing section along the rotation axis. a housing, comprising: a first housing section; and a second housing section forming an enclosure with the first housing section; and a first housing section; and a second housing section forming an enclosure with the first housing section; and a motorized assembly comprising: a drive motor arrangement that includes at least one drive motor; a drive shaft driven by the drive motor arrangement, the drive shaft matingly receiving the first housing section and being coupled to the second housing section, wherein operation of the drive motor arrangement drives the drive shaft to move the first housing section from a closed position adjacent the second housing section to an open position spaced from the second housing section; a rotor hub rotatingly driven by the drive motor arrangement; and at least two rotor blades coupled to the rotor hub and positioned within the enclosure in a collapsed position when the first housing section is in the closed position, the at least two rotor blades extending beyond the enclosure in an expanded position when the first housing section is in the open position, the at least two rotor blades being rotated by the drive motor arrangement to provide lift to the collapsible flying device; characterised in that the device further comprises a drive motor arrangement that includes at least one drive motor; a drive shaft driven by the drive motor arrangement, the drive shaft matingly receiving the first housing section and being coupled to the second housing section, wherein operation of the drive motor arrangement drives the drive shaft to move the first housing section from a closed position adjacent the second housing section to an open position spaced from the second housing section; a rotor hub rotatingly driven by the drive motor arrangement; and at least two rotor blades coupled to the rotor hub and positioned within the enclosure in a collapsed position when the first housing section is in the closed position, the at least two rotor blades extending beyond the enclosure in an expanded position when the first housing section is in the open position, the at least two rotor blades being rotated by the drive motor arrangement to provide lift to the collapsible flying device; characterised in that the device further comprises a housing rotation restriction structure coupled to the first housing section and the second housing section and inhibiting rotation of the first housing section relative to the second housing section about a rotation axis of the drive shaft, wherein the drive shaft has a threaded section and the first housing section has a complementary threaded section such that rotation of the drive shaft moves the first housing section relative to the second housing section along the rotation axis.