A closed wing is a wing that effectively has two main planes which merge at their ends so that there are no conventional wing tips. Closed-wing designs include the annular wing commonly known as the cylindrical or ring wing, the joined wing, the box wing and spiroid tip devices.
source/image(PrtSc): Found And Explained
The Lockheed commercial Ring Wing Airplane would be 52 meters long with a wing circumference of 7.4 meters, the wing itself would be a low mid-length attachment before arched back 27 degrees to join the tail of the aircraft, the total height is substantial that reaches up to 23 meters.
source/image(PrtSc): Found And Explained
Because a ring wing plane doesn’t have actual wingtips, the wingtip vortices and the downwash of the wing that they cause aren’t completely eliminated. Thus, the wing could generate more lift.
source/image(PrtSc): Found And Explained
The plane could carry up to 120 passengers and because of the fuel efficiencies of the design, it would be perfect for those commuter destinations that don’t really reach high altitudes.
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A key element of the ring wing airplane concept is to simultaneously reduce wing-loading and size over conventional aerobatic aircraft.
While modern competition aircraft typically have wing-loadings of around 14 to 16 lb/sq ft, the goal for Hummingbird is an effective wing loading of 12 to 13 lb/sq ft, while keeping wing span under 20ft.
