A drone comprising: a body defining a central axis; two or more arms, each arm (i) comprising a rotor disposed at a distal end portion, and (ii) being pivotally coupled to the body at a proximal end portion (106, 206) to allow a pivotal transition between a first, non-deployed state in which the arms extend substantially in a direction of the central axis, and a second, deployed state in which the arms extend from the body substantially in a radial direction with respect to the central axis; a biasing assembly that comprises (i) at least one biasing element, and (ii) at least one interfacing element (116, 216) being configured to be displaced by the biasing element, between a non-biased state and a biased state; wherein (i) during said displacement of the at least one interfacing element (116, 216), each of the at least one interfacing elements (116, 216) is configured to engage the proximal end portion (106, 206) of each respective arm so as to apply a biasing force sufficient to cause said pivotal transition, and wherein (ii) when the biasing assembly is in the biased state, each interfacing element (116, 216) restricts the pivotal transition of the arm and restrains it in the deployed state; wherein the biasing assembly comprises an axially displaceable member (113, 213) that is biased, by the biasing element, to displace between a retracted state and an extended state, said axially displaceable member (113, 213) being coupled to or integral with the interfacing element (116, 216), whereby the axially displaceable member (113, 213) causes displacement of the interfacing element (116, 216) between respective non-biased and biased states; characterized in that the axially displaceable member (113, 213) is capable of moving on a plane defined normal to the central axis; and in that the axially displaceable member (113, 213) is rotatable about at least two axes in said plane. a body defining a central axis; two or more arms, each arm (i) comprising a rotor disposed at a distal end portion, and (ii) being pivotally coupled to the body at a proximal end portion (106, 206) to allow a pivotal transition between a first, non-deployed state in which the arms extend substantially in a direction of the central axis, and a second, deployed state in which the arms extend from the body substantially in a radial direction with respect to the central axis; a biasing assembly that comprises (i) at least one biasing element, and (ii) at least one interfacing element (116, 216) being configured to be displaced by the biasing element, between a non-biased state and a biased state; wherein (i) during said displacement of the at least one interfacing element (116, 216), each of the at least one interfacing elements (116, 216) is configured to engage the proximal end portion (106, 206) of each respective arm so as to apply a biasing force sufficient to cause said pivotal transition, and wherein (ii) when the biasing assembly is in the biased state, each interfacing element (116, 216) restricts the pivotal transition of the arm and restrains it in the deployed state; (i) during said displacement of the at least one interfacing element (116, 216), each of the at least one interfacing elements (116, 216) is configured to engage the proximal end portion (106, 206) of each respective arm so as to apply a biasing force sufficient to cause said pivotal transition, and wherein (ii) when the biasing assembly is in the biased state, each interfacing element (116, 216) restricts the pivotal transition of the arm and restrains it in the deployed state; wherein the biasing assembly comprises an axially displaceable member (113, 213) that is biased, by the biasing element, to displace between a retracted state and an extended state, said axially displaceable member (113, 213) being coupled to or integral with the interfacing element (116, 216), whereby the axially displaceable member (113, 213) causes displacement of the interfacing element (116, 216) between respective non-biased and biased states; characterized in that the axially displaceable member (113, 213) is capable of moving on a plane defined normal to the central axis; and in that the axially displaceable member (113, 213) is rotatable about at least two axes in said plane.