wind-tunnel-model-designlisted

# Wind Tunnel Model Design (aerodynamics/wind-tunnel/wind-tunnel-model-design) Use when the task is designing the scale model and the test setup for a wind tunnel campaign on an aircraft configuration, the pre-test design step that fixes the model geometry and the loads the installation must carry before any runs. The model scale is driven by the smaller of two geometric constraints, the test section blockage limit and the span clearance to the walls; the model reference dimensions follow from the scale; the model Reynolds number at the maximum tunnel speed is compared with the full-scale flight Reynolds number; and the maximum test dynamic pressure and the resulting model load are used to rate the force balance and to size the model support sting. The leaf pairs with the post-test siblings: aerodynamics/wind-tunnel/windtunnel-data-reduction reduces the raw balance readings into coefficients after the runs, and aerodynamics/wind-tunnel/windtunnel-wall-corrections corrects measured coefficients for the test section boundaries; this leaf stops at the pre-test design and reports a Reynolds mismatch flag rather than a corrected result. The module constants BLOCKAGE_MAX (0.05), SPAN_CLEARANCE (0.8) and STING_ALLOWABLE_STRESS_PA (800 MPa) are documented typical values only: they are program and test specific inputs, and every function and the analyze pass accept explicit overrides. NACA TR-824 frames the compressible-flow context the tunnel operates in; the relations below are st