Upper surface blown powered lift system
US4426054A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 12, 1980 |
| Grant date | Jan 17, 1984 |
| Priority date | — |
| Expiry date | Nov 12, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T50/10
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
In an aircraft having a pair of engines mounted forwardly of the wing and discharging jet exhaust over the wing for augmented lift, a trailing edge flap is positioned directly behind each of the engines. Each flap has a stowed position for the cruise mode, a rearwardly and downwardly extending position for maximum deflection of the jet exhaust downwardly for STOL operation, and various intermediate positions. The upper aerodynamic surface of each flap is curved in a manner that the radius of curvature is a constant and uniform minimum at a forward portion of the flap and substantially greater at a rear portion of the flap. Each flap is moved from its stowed position, through intermediate positions to its fully deployed position in a manner that the upper aerodynamic surface of each flap forms a smooth and continuous extension of the fixed rear portion of the upper aerodynamic surface of the wing. Vortex generators are provided on the upper wing surfaces forward of flaps to generate vortices in the jet exhaust that travels over the upper surfaces of the flaps. This arrangement results in improved lift characteristics, reduced pitching moment with the flap in its deployed position, a…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.