COLLAPSIBLE AIRFOIL Russian patent published in 2013 - IPC F42B10/14 B64C3/56 B64C5/12 B64C9/34 

FIELD: weapons and ammunition.

SUBSTANCE: collapsible airfoil comprises a base and a hingedly connected rotary blade, a pusher and a screw converter of pusher progressive motion into rotary motion of the blade. The screw converter comprises two cylinders with helical surfaces and an interacting working element. Cylinders are arranged coaxially in series. One of cylinders is connected to the base, and the other one - with the blade, besides, the second cylinder has helical surfaces of another direction, in comparison to the helical surfaces of the first cylinder. The working element is made in the form of a threaded stem placed in inner cavities of cylinders with the possibility of progressive and rotary movements. The working element with one end is rigidly connected to the pusher sliding inside the first cylinder, and with the other end it is introduced into the second cylinder. Helical grooves made along the surface generator of the threaded stem in its middle part change their direction from one to another, which responds to helical surfaces of cylinders.

EFFECT: reliable opening of an airfoil under conditions of strong aerodynamic disturbances.

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