An unmanned flying device including a body, a first blade and at least a second blade, and a coupling assembly for coupling the first blade and the at least second blade to the body. Both the first blade and the at least second blade are rotateable about the body and are deployable away from the body via rotation of the first and the at least second blades about the body. The coupling assembly urges the collapsing of the first blade and the at least second blade towards the body.