| CPC B60F 5/02 (2013.01) [B62D 57/02 (2013.01); B63H 1/32 (2013.01); B64C 33/02 (2013.01); B60F 3/003 (2013.01)] | 22 Claims |

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1. A mechanical system comprising:
a curved beam;
a slider coupled to the curved beam and configured to alter an effective length of the curved beam; and
a motor coupled to the curved beam, wherein the motor is configured to impart a flapping motion to the curved beam.
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