100 mm Five-Blade Axial Fan Rotor (Smooth Baseline)

**100 mm Five-Blade Axial Fan – Smooth Baseline CAD** Create a simple, precise, CFD-friendly 3D solid model of a five-blade axial exhaust fan rotor. **Dimensions:** - Overall diameter: exactly 100 mm. - Hub diameter: 30 mm. - Hub height: 15 mm. - Central shaft hole: 8 mm diameter. - Five identical blades, equally spaced at exactly 72°. - Blade radial span: 35 mm, from the 15 mm hub radius to the 50 mm outer radius. - Blade chord: 28 mm at root, tapering to 20 mm at tip. - Blade airfoil: NACA 4412. - Blade setting angle: approximately 40° at root and 25° at tip, measured in degrees relative to the plane of rotation. **Geometry instructions:** Create five identical, smoothly curved and moderately twisted blades. Maintain consistent blade thickness and smooth transitions into the hub. Use the NACA 4412 profile accurately; do not force an incompatible 2 mm thickness. **Strict dimensional requirements:** - Center the rotor at X=0, Y=0. - Keep the entire rotor within X=-50 to +50 mm and Y=-50 to +50 mm. - Ensure the maximum radial distance from the rotation axis is exactly 50 mm. - Do not allow blades to extend beyond the 100 mm outer diameter. - Keep the five blades geometrically identical. **CFD optimization:** Use simple continuous CAD surfaces with minimal unnecessary edges and faces. Avoid decorative details, excessive fillets, fragmented surfaces, and unnecessary small features. Create one clean, watertight, manifold solid without gaps or self-intersections. Export as STEP (.step/.stp). Do not generate a dense triangular mesh. Do not include a motor, casing, or fluid domain. Prioritize dimensional accuracy, uniform blade geometry, and lightweight CAD construction over visual complexity.

Parameters

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