A wind tunnel test is used to study which of the following for scale models?

• A. Testing aerodynamic properties of scale models
• B. Testing engine combustion efficiency
• C. Testing crew comfort at different speeds
• D. Testing navigation systems

Answer: (A)

Wind tunnel testing is about how air flows around bodies and the forces and moments that result. When you test a scale model, the goal is to study aerodynamic properties such as lift, drag, pitching and other moments, pressure distribution over the surfaces, and stability characteristics. This information helps predict how the full-size vehicle will perform in flight and how it will respond to control inputs. The other topics—engine combustion efficiency, crew cabin comfort, and navigation systems—are not about airflow around a body, so they aren’t what wind tunnel tests measure.