Patent ID: 8887484

Claim:
Thrust vectoring apparatus for a jet engine, the jet engine being operable to exhaust a primary jet to generate thrust; and the apparatus comprising: (i) a housing defining a primary outlet for emitting the primary jet; (ii) first and second Coanda surfaces extending from opposing regions of an exhaust end of said housing, each Coanda surface being outwardly spaced from the primary outlet such that a first and a second step are each defined between the respective first and second Coanda surfaces and the primary outlet; whereby, when a primary jet is exhausted through the primary outlet, low pressure regions are formed in the vicinity of said steps; (iii) ducts leading from a fluid source to first and second secondary outlets, the first secondary outlet being located adjacent the first Coanda surface and the second secondary outlet being located adjacent the second Coanda surface, the first and second secondary outlets each being arranged to emit a respective first and second secondary flow into the low pressure region in the vicinity of the respective first and second steps defined between the respective first and second Coanda surfaces and the primary outlet; and (iv) flow control means operable to control the mass flow through the first and second secondary outlets respectively to be within the range 0% to 5% of the mass flow in the primary jet such that when the first secondary flow is emitted from the first secondary outlet the primary jet is entrained by the second Coanda surface and when the second secondary flow is emitted from the second secondary outlet the primary jet is entrained by the first Coanda surface.