Wind turbines · Home and off-grid wind turbines (2.86 to 5.5 m)
Wind turbine rotor 3.5 m, 7 blades, serrated trailing edge
Model designed and computed with the Heliciel software. Design point: 12 m/s wind, 300 rpm (tip speed ratio 4.6), best-efficiency speed found by Heliciel at the published rated wind speed of a commercial home wind turbine of the same diameter. NACA 64A410 airfoil and optimal Glauert chords for 7 blades, at the best-efficiency speed found by Heliciel; tip chord of at least 2.5 % of the diameter, as on Heliciel's wind turbine model. Serrated trailing edge on the two tip elements, near-equilateral teeth (20 % of chord peak to peak): geometry only, performance computed on the smooth blade.
The pack contains the complete propeller as a full-definition STL with root fillet, the Heliciel .hlc project and the computation records. Serrated trailing edge: geometry only, no STEP; the stated performance and strength are computed on the smooth blade.
Characteristics computed by Heliciel
| Diameter | 3500 mm |
|---|---|
| Number of blades | 7 |
| Hub diameter | 542.4 mm |
| Design speed | 300 rpm |
| Fluid speed at design point | 12 m/s |
| Axial load | 826.74 N |
| Torque | 166.890 N·m |
| Shaft power | 5243 W |
| Power coefficient Cp | 0.57 |
| Tip speed ratio (TSR) | 4.6 |
| Blade shape | optimal chords (Glauert), serrated trailing edge (2 tip elements, 11 teeth per element, 20 % of chord peak to peak ; geometry only) |
| Airfoil | NACA 64A410 (transition turbulente) |
| Angles of attack | smoothed (5° along the whole blade) |
| Bore | 108 mm |
| Hub length | 175 mm |
| Blade thickness | 22.6 mm at the root, 17.0 mm at mid-radius (r = 862.7 mm), 8.7 mm at the tip |
| Material used in the computation | woven carbon/epoxy laminate |
| Strength at design point | yes |
| Direction of rotation | right-hand |
| Files included | STL, HLC |
| Reference | H-3500-7p-Z |
Need a propeller for your own parameters?
This model was designed and computed with the Heliciel software. For a custom propeller there are two ways: the Heliciel software (Windows: computation, 3D view, STL and STEP exports), and the Heliciel MCP connector, which lets your AI assistant — ChatGPT, Claude, Le Chat and any MCP client — compute a real propeller, with a free 1-day discovery pass.
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