US 11,840,329 B1
Contra-rotating electric helicopter
Brian L Hinman, Carmel Valley, CA (US)
Assigned to SiFly Aviation, Inc., Carmel Valley, CA (US)
Filed by SiFly Aviation, Inc., Carmel Valley, CA (US)
Filed on Nov. 8, 2022, as Appl. No. 17/983,111.
Claims priority of provisional application 63/276,891, filed on Nov. 8, 2021.
Int. Cl. B64C 27/10 (2023.01); B64D 27/24 (2006.01); B64C 1/26 (2006.01); B64D 35/00 (2006.01); B64C 27/78 (2006.01)
CPC B64C 27/10 (2013.01) [B64C 1/26 (2013.01); B64C 27/78 (2013.01); B64D 27/24 (2013.01); B64D 35/00 (2013.01); B60L 2200/10 (2013.01)] 18 Claims
OG exemplary drawing
 
1. An electrically powered vertical-lift aircraft, comprising:
a power source;
a first electric motor having a base and an output shaft configured to rotate relative to the base, the first electric motor coupled to the power source;
a first lifting rotor having: (i) a first axis of rotation, (ii) a first rotating frame of reference, and (iii) a first set of rotor blades, the first rotor coupled to the base of the first electric motor;
a second lifting rotor having a second axis of rotation and a second set of rotor blades, the second axis of rotation being coaxial with the first axis of rotation, the second rotor coupled to the output shaft of the electric motor; and
a second electric motor in the first rotating frame of reference, and an associated cyclic control computer, configured to cause cyclic pitch adjustment of the first set of rotor blades.