Abstract: An aerodynamic blade for a motor vehicle includes a shutter mounted on a support shaft having an axis and connected to a chassis of a vehicle by at least one support, and driven in rotation around said axis between an open position and a closed position by a motor assembly. The motor assembly includes one or more elements configured to accumulate mechanical energy and having an adjustable stored energy level to meet a demand for a sufficient torque to change a position of the shutter in a time of less than one second.

Abstract: A device for maneuvering one or more sets of flaps formed of one or more flaps, each flap pivoting about an axis of rotation (a1a1?, b1b1?, c1c1?, d1d1?, a2a2?, b2b2?, c2c2?, d2d2?) mounted on a chassis. The flaps of a set of flaps are set in rotation by at least one activating plate that moves in translation between two end positions in a main direction (YY?) substantially perpendicular to the axes of the flaps, the activating plate having guide slots, each of the guide slots engaging with a finger disposed on a set of link rods mounted on an upper edge and/or lower edge of each of the flaps of the set, such that movement of the activating plate between the end positions in one direction and in an opposite direction causes each of the flaps of the set of flaps to open and close, respectively.