Boats · Water-ski boat propellers (B-series, 12 to 15 in)
Water-ski boat propeller 12 × 15 in, 4 blades (B4-70 series)
Model designed and computed with the Heliciel software. Design point: 2937 rpm at 16.11 m/s (58 km/h), J = 1.080, sea water. Exact geometry of the Wageningen B4-70 B-series at catalogue size: 12 × 15 in (305 × 381 mm), P/D 1.25, 4 blades. The pack holds both hands of rotation (right-hand and left-hand STL). Strength not guaranteed: at the design point the blade root does not hold in NAB bronze; thickness and material are to be sized for a real propeller.
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 | 304.8 mm |
|---|---|
| Number of blades | 4 |
| Catalogue size (diameter × pitch) | 12 × 15 in |
| Series | Wageningen B4-70 (B-screw series) |
| Expanded area ratio Ae/A0 | 0.70 |
| Pitch ratio P/D | 1.25 |
| Blade shape | B-series segmental sections, constant pitch |
| Hub diameter | 61 mm |
| Pitch at 0.7 R | 381 mm (15.0 in) |
| Design speed | 2937 rpm |
| Fluid speed at design point | 16.11 m/s |
| Thrust | 3474 N |
| Torque | 241.1 N·m |
| Shaft power | 74140 W |
| Propulsive efficiency | 0.76 |
| Material used in the computation | nickel-aluminium bronze (NAB) |
| Strength at design point | not guaranteed: blade root to be sized (does not hold in NAB at the design point) |
| K_T and 10·K_Q computed by Heliciel | 0.163 and 0.372 |
| J at maximum efficiency (Wageningen polynomials) | 1.080 |
| Open-water efficiency of the series at this J (polynomials) | 0.73 |
| K_T and 10·K_Q of the series at this J (polynomials) | 0.119 and 0.279 |
| Direction of rotation | right-hand |
| Files included | STL, STEP, HLC |
| Reference | N-305-4p-P381 |
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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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