Patent ID: 8746613

Claim:
A jet engine exhaust nozzle, comprising: a. a relatively upstream duct portion adapted to receive a stream of exhaust gas generated by a jet engine, wherein a central axis of said relatively upstream duct portion is along a first direction; b. a bent duct portion downstream of said relatively upstream duct portion; c. a final duct portion downstream of said bent duct portion, wherein a central axis of said final duct portion is along a second direction, said second direction is oblique to said first direction, and said final duct portion is bent in a third direction relative to said relatively upstream duct portion by said bent duct portion; and d. an exit terminus of said final duct portion, wherein said exit terminus is scarfed so that a first trailing edge portion of said exit terminus on a first side of said final duct portion extends aftward of a second trailing edge portion of said exit terminus on a second side of said final duct portion, relative to said central axis of said final duct portion of said jet engine exhaust nozzle, said first and second sides are substantially opposite one another relative to said central axis of said final duct portion, and said first side of said final duct portion is in said third direction relative to said second side of said final duct portion, wherein in operation, said exhaust gas is discharged from said exit terminus in a fourth direction, said final duct portion in cooperation with said exit terminus provides for said fourth direction to be relatively aligned with said second direction when said jet engine exhaust nozzle is operated at a first nozzle pressure ratio, and said final duct portion in cooperation with said exit terminus provides for said fourth direction to be relatively oblique with respect to said second direction in a direction opposite to said third direction when said jet engine exhaust nozzle is operated at a second pressure ratio, said first nozzle pressure ratio is less than said second nozzle pressure ratio, and a direction of said fourth direction responsive to said nozzle pressure ratio of said jet engine exhaust nozzle is inherently passively responsive to an interaction of said stream of exhaust gas with said jet engine exhaust nozzle, independent of any moving parts.