Tetrahedron

TETRAHEDRON - Ground-based, free-rotating, triangular-shaped wind direction indicator, genrally placed near a runway.

TETRAHEDRON- A device normally located on uncontrolled airports and used as a landing direction indicator. The small end of a tetrahedron points in the direction of landing.

After conducting a thorough pre-flight inspection of the aircraft, we will want to check the airport windsock or wind tetrahedron to determine the surface wind direction and velocity.

MAYNE has an invention for the five- or six-stick flat kites.
Six-stick kites. Single-cell tetrahedron kite. [36] The six-stick kite was the foundation of Alexander Graham Bell's tetrahedral kites.

See also: Maintain, Pilot, Flight, Altitude, Radar