Every plane wing tilts slightly upward — and that small angle changes everything. Known as dihedral, this design feature creates natural stability, letting aircraft recover from turbulence and roll ...

1. Two angles and two planes. This drawing is marked: 2A-2PL*. Compare model 1979.0102.262. 2. Line perpendicular to two skew lines . A mark reads: L {perpendicular}2SL* For an example of the model, ...