Patent ID: 11866161
Assignee: nan
Field: Transport (Mechanical engineering)
Classification: CPC B  Y | IPC B

Claim 1:
2. The electric helicopter of claim 1, further comprising:
a second annular rotor, the second annular rotor including an open center, a second plurality of rotor blades extending radially outwardly from the second annular rotor, each rotor blade of the second plurality of rotor blades being coupled to the second annular rotor with a first pivot coupling, the pitch of each rotor blade of the second plurality of rotor blades being adjustable at the first pivot coupling, at least a portion of the fuselage being disposed in the open center of the second annular rotor, the second annular rotor being rotatable about a second annular rotor axis, the second annular rotor axis being perpendicular to the first roller axis, and the second annular rotor axis being aligned with the first annular rotor axis, and the the second annular rotor being concentric with, parallel to and spaced apart from the first annular rotor; and
the first roller abutting and frictionally engaging the second annular rotor, and rotation of the first roller causing rotation of the second annular rotor and first annular rotor, a direction of rotation of the second annular rotor being opposite the first direction of rotation of the first annular rotor.