Patent ID: 7793504

Claim:
An apparatus, comprising: a gas turbine engine including at least one compressor and at least one turbine; a nozzle defining a passage operable to receive working fluid from the turbine for discharge to produce thrust, the nozzle including a first convergent flap pivotally connected to a first divergent flap and operable to define an adjustable throat for a convergent-divergent configuration of the nozzle along the passage; and a first conduit operable to selectively direct pressurized fluid from the compressor into a first actuation plenum, the first convergent flap being pivotally mounted to rotate in response to a controlled change in the pressurized fluid in the actuation plenum to adjust size of the throat, the first convergent flap fixed relative to a balance member such that both rotate about a common pivot axis; and wherein the balance member extends into the first actuation plenum to divide the first actuation plenum into a first chamber and a second chamber, the first conduit opens into the first chamber, and the pressurized fluid is selectively directed into the first chamber to apply force to the balance member to rotate the first convergent flap in a first direction.