CPC B64C 29/0033 (2013.01) [B64C 3/10 (2013.01); B64C 9/02 (2013.01); B64C 11/48 (2013.01); B64D 27/24 (2013.01); B64D 35/06 (2013.01); G05D 1/0858 (2013.01)] | 20 Claims |
1. A stacked propeller comprising:
a first propeller configured to rotate about an axis of rotation;
a second propeller positioned behind the first propeller and configured to rotate about the axis of rotation, the first propeller protruding from or flushed with a duct and the second propeller being encapsulated by the duct; and
a first motor configured to rotate the first propeller and the second propeller in a first mode of operation.
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