A mechanism for unfolding wings of air vehicles, comprising: a plurality of wings, each comprising a first part fixed to the body of the air vehicle and a second part pivotally supported by the first part; and an unfolding and locking assembly, comprising at least: a bracket attached to both the first part and the second part of the plurality of wings at the center, for enabling the lift and rotational movements of the plurality of wings; a first flexible member pre-stressed for lifting the second part of the plurality of wings about a first pivot axis; a first locking member for locking the lift movement of the plurality of wings with the bracket after the second part of the plurality of wings has pivoted about the first pivot axis; characterized in that a second flexible member is pre-stressed in the fully folded condition to produce an initial moment tending to pivot the second part of the plurality of wings about a second pivot axis after the second part of the plurality of wings has pivoted about the first pivot axis; a second locking member for locking the plurality of wings when received in a socket member after the second part of the plurality of wings has pivoted about the second pivot axis, wherein the unfolding and locking assembly further comprises a pair of hinge pins (308a, 308b) attached to the bracket for enabling lift and rotational movement of the second part of the plurality of wings about the pair of hinge pins (308a, 308b). a plurality of wings, each comprising a first part fixed to the body of the air vehicle and a second part pivotally supported by the first part; and an unfolding and locking assembly, comprising at least: a bracket attached to both the first part and the second part of the plurality of wings at the center, for enabling the lift and rotational movements of the plurality of wings; a first flexible member pre-stressed for lifting the second part of the plurality of wings about a first pivot axis; a first locking member for locking the lift movement of the plurality of wings with the bracket after the second part of the plurality of wings has pivoted about the first pivot axis; characterized in that a second flexible member is pre-stressed in the fully folded condition a bracket attached to both the first part and the second part of the plurality of wings at the center, for enabling the lift and rotational movements of the plurality of wings; a first flexible member pre-stressed for lifting the second part of the plurality of wings about a first pivot axis; a first locking member for locking the lift movement of the plurality of wings with the bracket after the second part of the plurality of wings has pivoted about the first pivot axis; characterized in that a second flexible member is pre-stressed in the fully folded condition to produce an initial moment tending to pivot the second part of the plurality of wings about a second pivot axis after the second part of the plurality of wings has pivoted about the first pivot axis; a second locking member for locking the plurality of wings when received in a socket member after the second part of the plurality of wings has pivoted about the second pivot axis, wherein the unfolding and locking assembly further comprises a pair of hinge pins (308a, 308b) attached to the bracket for enabling lift and rotational movement of the second part of the plurality of wings about the pair of hinge pins (308a, 308b).