TS 2562

TS 2562 is a flight-dynamics terminology standard for the terms and symbols used for derivatives of forces, moments, and their coefficients. In practice, these derivatives describe how aerodynamic loads change with variables such as speed, angle of attack, sideslip, and control-surface motion.

Why force, moment, and coefficient derivatives matter

In flight dynamics, forces govern translational motion and moments govern rotational motion. Expressing them in coefficient form makes the quantities easier to compare across different aircraft sizes and operating conditions. Derivatives then describe sensitivity: they show how a coefficient changes with respect to a chosen variable, helping engineers reason about stability and control effects caused by small changes in speed or attitude. This is fundamental language for stability analysis, control design, and performance interpretation.

The terminology covered by this standard

Based on the supplied scope, this standard covers the terms and symbols for derivatives of the forces acting on an aircraft, the moments acting on an aircraft, and their coefficients. It is therefore a nomenclature and symbol standard rather than a test method, numerical specification, or performance requirement. Standards of this type support consistent use of notation in design work, analysis, and technical documentation.

• Provides common terminology for derivatives of aircraft force quantities.
• Sets a consistent symbol framework for moment derivatives.
• Supports interpretation of coefficient derivatives in flight-dynamics work.
• Helps standardize communication in stability and control analysis.
• Referenced as equivalent to ISO 1153:1972.