Axial fan generator
Generate a printable axial fan rotor — twisted blades at a pitch you set, on a hub bored for your motor shaft
The twist is one number. Pitch is how far the fan would advance in a single turn if it screwed through a solid — the figure every propeller is sold on — and from it the blade angle falls away from hub to tip on its own, steep where the blade moves slowly and flat where it moves fast. There are no per-station angles to invent. Choose a flat plate for the simplest thing to print, or one of the published NACA four-digit aerofoils; either way both edges are blunted to a thickness your nozzle can actually lay down, because an aerofoil comes to a knife edge on paper. Set the swept diameter, the hub, the blade count and the chord at each end, and bore the hub for your motor shaft with an optional D-flat. The tips are trimmed to the swept circle, so the diameter on the field is the diameter that has to clear the frame. It makes no claim about how much air the rotor moves — that depends on the shroud, the tip clearance and the motor. Download a print-ready STL or 3MF.
How the Axial fan generator works
What you can adjust
- Tip diameter — 20–400 mm
- Pitch — 2–500 mm
- Blade count — 2–24
- Turns — Anticlockwise · Clockwise
- Blade section — Flat plate · NACA 0012 · NACA 2412 · NACA 4412
- Chord at the hub — 2–200 mm
- Chord at the tip — 2–200 mm
- Edge thickness — 0.3–8 mm
- Hub diameter — 6–300 mm
- Hub height — 2–200 mm
- Shaft diameter — 1–100 mm
- Shaft flat — 0–20 mm
- Fit — Tight · Normal · Loose · Custom
- Bore clearance — -1–3 mm