Ronald L Bengelink

US Patent:

44899050, Dec 25, 1984

Filed:

Sep 30, 1981

Appl. No.:

6/307286

Inventors:

Ronald L. Bengelink - Renton WA
Robert H. Wickemeyer - Redmond WA

Assignee:

The Boeing Company - Seattle WA

International Classification:

B64D 2902

US Classification:

244130

Abstract:

A below-wing engine nacelle mounted by a pylon forwardly of a wing having a rearward sweep. The pylon upper outboard edge that extends forwardly of the wing is formed with a relatively sharp radius of curvature. Thus, airflow which flows over the top of the pylon in an outboard direction separates over the sharp pylon edge to form a vortex which passes beneath the wing adjacent the outboard surface of the pylon. This vortex maintains attached flow at the outboard pylon surface immediately beneath the wing to reduce drag.