Implementations of an unmanned aerial vehicle (UAV) provided with detachable motor arms are provided. In this way, the UAV may be conveniently stored and transported, rapidly assembled in the field, and repaired in the event of a crash. Also, the motor arms are configured to separate from the fuselage of the UAV upon crashing into the ground and / or another object. In this way, damage to the motors arms and / or the fuselage of the UAV may be minimized or prevented. An example UAV comprises a fuselage having two motor arms detachably secured thereto, each motor arm is detachably secured to the fuselage by two mechanical connectors (or fuses) and comprises a tube having a rotary wing propulsion system on each end thereof. The mechanical connectors securing each motor arm to the fuselage of the UAV are configured to facilitate the separation of the motor arm from the fuselage during a crash.