Patent ID: 7728265

Claim:
A projectile, comprising: a flow surface; and a plurality of microelectromechanical (MEMS) apparatus being disposed at the flow surface, wherein each MEMS apparatus of said plurality of MEMS apparatus comprises a substrate, which defines a first plane, a duct is attached to the substrate, the duct and the substrate define a fluid flow channel, and a rotatable flap comprises a flow receiving portion and an extension portion where the flow receiving portion is disposed in the fluid flow channel, wherein, in an actuated position of the rotatable flap, a fluid flow against the flow receiving portion causes rotation of the rotatable flap and movement of the extension portion out of the first plane of the substrate, wherein, in a rest position of the rotatable flap, the MEMS apparatus is substantially flush with the flow surface, and wherein, in the actuated position of the rotatable flap, the extension portion of the rotatable flap extends out of a plane of the flow surface.