Patent ID: 9732700
Date: 2017-08-15
CPC Classifications: B64C,B64D,F02K,F05D,Y02T

Claim:
1. A jet propulsion device having a flow vectoring duct, the jet propulsion device comprising: a substantially annular exhaust duct surrounding a jet engine center body forming a pair of concentric opposing inner and outer walls; a throat region substantially symmetrically positioned in the outer wall of the exhaust duct forming a region of convergence, where the inner and outer walls converge, an amount of convergence varying longitudinally along the inner and outer walls; and a region of divergence, where the inner and outer walls diverge, an amount of divergence varying longitudinally along the inner and outer walls, an exit vector of an outlet plume at a first bypass engine operating condition is different than the exit vector at a second bypass engine operating condition, wherein the exit vector of the outlet plume transitions at a nozzle pressure ratio of approximately between 1.6 and 1.89, a first transition from the first bypass engine operating condition to the second bypass engine operating condition at which the differential directing of the plume occurs corresponds to a second transition between a low speed operation and a high speed operation.