Hexagon has no degrees of freedom but can seen as directed edges. Hexagons of symmetry g2, i4, and r12, as parallelogons can tessellate the Euclidean plane by translation. Other hexagon shapes can tile the plane with different orientations. The 6 roots of the simple Lie group , represented by a Dynkin diagram , are in a regular hexagonal pattern. The two simple roots have a 120° angle between them. The 12 roots of the Exceptional Lie group G2, represented by a Dynkin diagram are also in a hexagonal pattern. The two simple roots of two lengths have a 150° angle between
A Plane Is Born A Plane Is Born A Plane is Born, presented by Mark Evans, was a 15 part series for Discovery Home and Leisure (now Discovery Real Time), in which he not only learned to fly but also built his own Europa two-seater aeroplane. During the course of the series, he tackled everything from the composite control surfaces to the installation of the engine. The series took the viewer for the first time through the step-by-step process of building a 200 mph kit aircraft, capable of flying from England to the South of France on a single tank of fuel. - Research