Patent ID: 8387912
Filing Date: 2013-03-05
Classification: B64C

Abstract:
1. In a lifting foil wherein a coordinate system has its origin at the center-of-gravity of foil and employs 3-axis, X, Y, Z Cartesian coordinate designations wherein +Y is starboard, −Y is port, +X is fore, −X is aft, +Z is up and −Z is down relative to gravity and is subject to a −X freestream, the combination of (a) a lower configuration having a lower trailing course with a positive camber having a lower starboard margin and a lower port margin, said lower course extending sideward between said lower starboard margin and said lower port margin and being responsive to fluid flow in a direction −X, for generating a first fluid reaction force having a first lifting component in a direction +Z, (b) an upper configuration having an upper leading course with a positive camber having an upper starboard margin and an upper port margin, said upper course being positioned above said lower trailing course and extending sideward between said upper starboard margin and said upper port margin for generating a second fluid reaction force having a second lifting component in said direction +Z, parallel and additive to said first reaction force, (c) a starboard flow guide extending vertically between said lower starboard margin and said upper starboard margin, having a progressively adjusted camber for suppressing spanwise fluid flow in a direction +Y, perpendicular to X and Z, and (d) a port flow guide extending vertically between said lower port margin and said upper port margin, having a progressively adjusted camber for suppressing spanwise fluid flow in a direction −Y, opposite to +Y, wherein a proportionally higher downwash angle is gained in said upper leading course of said upper configuration by virtue of sufficient positive stagger relative to said lower trailing course in said lower configuration and as stagger increases between said upper leading course said lower course creates overall increased lift.