Electric outboard propeller 250 mm, 3 blades (kayak, tender)
Model designed and computed with the Heliciel software. Design point: 1,200 rpm at 4 knots, shaft 30 cm below the surface. For electric kayak or tender thrusters.
The pack contains the complete propeller as a full-definition STL with root fillet, STEP surfaces (complete propeller and one blade), the Heliciel .hlc project and the computation records.
Characteristics computed by Heliciel
| Diameter | 250 mm |
|---|---|
| Number of blades | 3 |
| Hub diameter | 50 mm |
| Pitch at 0.7 R | 237 mm (9.3 in) |
| Design speed | 1200 rpm |
| Fluid speed at design point | 2.06 m/s |
| Thrust | 448.89 N |
| Torque | 15.156 N·m |
| Shaft power | 1905 W |
| Propulsive efficiency | 0.49 |
| Blade shape | classic |
| Angles of attack | smoothed (4° along the whole blade) |
| Bore | 10 mm |
| Hub length | 70 mm |
| Blade thickness | 5.2 mm at the root, 5.3 mm at mid-radius (r = 62.5 mm), 3.3 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, STEP, HLC |
| Reference | F-250-3p |
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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