Static or steady-state aeroelasticity deals with phenomena that integrate the elastic and aerodynamic forces. The static aeroelastic phenomena in this chapter include lift effectivenessLift effectiveness, control effectivenessControl effectiveness, divergenceDivergence and trim conditionsTrim conditions for rigid and flexible aircraft. Starting with the modelling concepts of static aeroelasticity, the static aeroelasticity of a fixed cantilever wing is detailed first for simplicity. More complicated models, restrained and unrestrained aircraftUnrestrained aircraft structures, are then provided. Trim conditionsTrim conditions for rigid and flexible aircraft are modelled, whereas all the static aeroelastic models are generated computationally.