Dihed

Stabilising and manuevering engines in an airship are known as Diheds, short for Dihedrals. Diheds are usually two or three small engines or gyroscopes arranged to provide roll stability. In fact their name derives from a practice in construction of Aerofoil craft to angle wings upward from their roots at what is known as the Dihedral Angle, leading to greater stability in roll.

Diheds vary widely from one shipbuilder to another; propellers, jets and gyroscopes have all been used.