Enclosures and housings
Cyclocopter Main Rotor Assembly
- Bounding box
- 258.5 × 377.5 × 260.3 mm
- Engine
- Precision B-rep
- Parameters
- 25
- Published
- November 4, 2026
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The prompt
Role: Act as a professional aerospace CAD engineer. Generate a fully parametric, solid 3D model of a cyclocopter main rotor assembly. Use millimeters (mm) for all dimensions. Ensure the geometry is watertight and ready for STEP export. 1. Coordinate System & Central Axis: Align the main axis of rotation along the Y-axis. Create a central cylindrical shaft with a diameter of 12 mm and a length of 350 mm. 2. Rotor End Plates (Discs): Create two circular end plates (discs) centered on the main shaft, separated by a distance of 280 mm along the Y-axis. Each disc must have an outer diameter of 240 mm (radius 120 mm) and a thickness of 5 mm. 3. Blades (Airfoil & Geometry): Create 6 identical blades connecting the two end plates. Airfoil Profile: The cross-section of each blade must strictly follow a NACA 0012 symmetric airfoil profile. Dimensions: Each blade must have a span (length) of 280 mm (connecting the two end plates), a chord length (width) of 80 mm, and a maximum thickness of 9.6 mm (which is 12% of the chord, per NACA 0012 specs). Arrangement: The blades must be arranged like a paddle wheel, parallel to the central Y-axis, and spaced equally at 60-degree intervals around the circumference (diameter 240 mm). Pitch Angle: The blades must be oriented at a baseline pitch angle of +10° relative to the tangent of their circular path. 4. Pitching Mechanism (Kinematics): Create a simplified 4-bar linkage system or eccentric ring mechanism for each blade. Add pivot points (small cylinders) at the center of the chord for each blade, allowing rotation around the blade's own spanwise axis. Connect these pivot points to the central shaft using connecting rods (thickness 3 mm) to represent the cyclic pitch control mechanism, which allows the blade pitch to vary within a range of ±25°. 5. Tail Rotor (Optional but preferred for context): At the rear of the central shaft, create a vertical tail fin (thickness 10 mm). Attach a small helicopter-style tail rotor to this fin. Diameter of the tail rotor = 60 mm, with 2 blades. Output Requirements: Use parametric code (CadQuery/OpenSCAD) or direct CAD features. Ensure all parts are distinct solid bodies within a single assembly. Provide the final model in a format suitable for STEP export.
Parameters
| Name | Value | Range |
|---|---|---|
| Shaft Diameter | 12 mm | 6 – 40 |
| Shaft Length | 350 mm | 100 – 600 |
| End Plate Diameter | 240 mm | 100 – 400 |
| End Plate Thickness | 5 mm | 2 – 20 |
| Plate Spacing (Blade Span) | 280 mm | 60 – 500 |
| Blade Count | 6 pcs | 2 – 12 |
| Blade Chord | 80 mm | 20 – 160 |
| NACA Thickness Ratio (t/c) | 0.12 - | 0.06 – 0.2 |
| Baseline Pitch Angle | 10 deg | -30 – 30 |
| Pitch Circle Radius | 120 mm | 40 – 200 |
| Pitch Pivot Diameter | 14 mm | 6 – 30 |
| Pitch Pivot Length | 20 mm | 5 – 60 |
| Connecting Rod Width | 6 mm | 2 – 16 |
| Connecting Rod Thickness | 3 mm | 1 – 10 |
| Eccentric Collar OD | 50 mm | 20 – 120 |
| Eccentric Collar Thickness | 10 mm | 3 – 40 |
| Eccentric Collar Y Station | -100 mm | -170 – -20 |
| Tail Fin Thickness | 10 mm | 3 – 30 |
| Tail Fin Height | 80 mm | 20 – 200 |
| Tail Fin Length | 60 mm | 20 – 200 |
| Tail Rotor Hub Diameter | 12 mm | 4 – 30 |
| Tail Rotor Hub Length | 15 mm | 5 – 50 |
| Tail Blade Length | 30 mm | 10 – 80 |
| Tail Blade Chord | 8 mm | 3 – 30 |
| Tail Rotor Height (Z) | 45 mm | 0 – 250 |
Every value above is a live dimension. Open a model like this in the editor and each one becomes a slider you can drag before exporting.
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