Design an Airfoil in Solidworks

A: Governing principle: Airfoil tables encode surface order, not just shape. Starting at x=1.0 and returning there is a standard TE–LE–TE traversal, and misreading it flips surfaces or creates self-intersections. Option B catches people used to CFD grids where axis mirroring is common, but that's not what this pattern indicates.

A: Governing principle: Model material should reflect service environment, not end-use aspiration. Salt fog and repeated layups attack aluminum through pitting and contaminate composites; sealed tooling board matches actual degradation drivers. Option B tempts engineers who chase stiffness parity and ignore corrosion and contamination pathways.

A: Governing principle: Fix orientation errors at the lowest feature level. Correcting the sketch plane normal preserves design intent and avoids handedness errors in derived features. Option B snares people who treat solids as static geometry and forget downstream parametric dependencies.

A: Governing principle: NACA designation encodes fixed geometric ratios. A true 2412 cannot become 10% without redefining the family, so a generic or misused callout is more probable than a perfect-yet-wrong CAD. Option C traps engineers who forget that uniform chord scaling preserves thickness ratio.

A: Governing principle: Mass properties are sensitive to density and units before geometry fidelity. A 2% CG shift is consistent with unit or density mismatch and should be cleared before questioning validated airfoil data. Option B lures engineers who trust authority tables without auditing their own model assumptions.

A: Governing principle: Comparative studies need controlled variables. Using identical isotropic properties isolates geometric influence and avoids false precision from guessed composites. Option B traps analysts who reach for realism without validated layups or orientations.

A: Governing principle: Coordinate system conventions matter as much as values. Many aero datasets use positive-down Y, and importing them directly flips camber while staying fully defined. Option B catches users who equate black sketches with correctness, ignoring reference frames.

A: Governing principle: CFD preprocessors fail on topology, not aesthetics. Zero-thickness or knife-edge trailing edges break meshing and must be resolved before file handoff. Option D tempts CAD users who confuse display fidelity with geometric validity.

A: Governing principle: CTE mismatch drives dimensional error under thermal cycles. Steel and aluminum diverge enough at 180°C to shift profile beyond aero tolerance even if strength is ample. Option B traps engineers thinking in process kinetics rather than geometric conformity.