Dihedral

Dihedral is the upward angle of the wing from the vertical when seen from the front, or nose of the aircraft.

[flight dynamics] twist, dihedral and wingtips 2009

Dihedral (di-he'dral) -- Said of wing pairs inclined at an upward angle to each other.

The Handy Cyclopedia of Things Worth Knowing A Manual of Ready Reference Joseph Triemens

= Angle, Rigger's Longitudinal Dihedral = -- Ditto, but substituting "chords" for "neutral lift lines."

The Aeroplane Speaks Fifth Edition 1919

Incidence, Dihedral and Stagger, amid a chorus of groans from all parts of the Aeroplane.

The Aeroplane Speaks Fifth Edition 1919

= Angle, Lateral Dihedral = -- The lifting surface of an aeroplane is said to be at a lateral dihedral angle when it is inclined upward towards its wing-tips.

The Aeroplane Speaks Fifth Edition 1919

= Angle, Dihedral = -- The angle between two planes.

The Aeroplane Speaks Fifth Edition 1919

The Dihedral Angle -- that is, the upward inclination of the Surfaces towards their wing-tips -- does what it can for me, but, in my opinion, it's a more or less futile effort.

The Aeroplane Speaks Fifth Edition 1919

= Angle, Longitudinal Dihedral = -- The main surface and tail surface are said to be at a longitudinal dihedral angle when the projections of their neutral lift lines meet and produce an angle above them.

The Aeroplane Speaks Fifth Edition 1919

There was Centrifugal Force, too, who would not sit still and created a most unfavourable impression, and Keel-Surface, the Dihedral Angle, and several other lesser fry.

The Aeroplane Speaks Fifth Edition 1919

And he at once showed them two Surfaces, each set at a Dihedral Angle like this:

The Aeroplane Speaks Fifth Edition 1919