Patent ID: 8371124
Filing Date: 2013-02-12
Classification: F02K

Abstract:
1. In a jet engine having a plug nozzle and a plug extending rearwardly from the nozzle exit, the improvement comprising a) said plug having successive cross sections spaced apart rearwardly of the nozzle exit, b) said cross sections changing from circular or near circular at the exit plane defined at the nozzle exit, to progressively non-circular, rearwardly, c) each cross section defining a median line minor axis and a major axis bi-secting said minor axis, and longer than said minor axis, d) the minor axes of successive cross-sections in a rearward direction progressively decreasing in length, beyond a mid-portion of the plug length protruding from the nozzle exit, e) said cross-sections at ends of said major axes having convex surface outlines directed from and protruding away from said major axes at distal ends thereof, f) the major axes of successive cross-sections in a rearward direction substantially between the nozzle exit and said plug length mid-portion remaining substantially the same.