Boats · Wakesurf boat propellers (B-series, 16.5 to 18 in)
Wakesurf boat propeller 18 × 19 in, 4 blades (B4-70 series)
Model designed and computed with the Heliciel software. Design point: 730 rpm at 5.00 m/s (18 km/h), J = 0.899, sea water. Exact geometry of the Wageningen B4-70 B-series at catalogue size: 18 × 19 in (457 × 483 mm), P/D 1.06, 4 blades. The pack holds both hands of rotation (right-hand and left-hand STL).
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 | 457.2 mm |
|---|---|
| Number of blades | 4 |
| Catalogue size (diameter × pitch) | 18 × 19 in |
| Series | Wageningen B4-70 (B-screw series) |
| Expanded area ratio Ae/A0 | 0.70 |
| Pitch ratio P/D | 1.06 |
| Blade shape | B-series segmental sections, constant pitch |
| Hub diameter | 91.4 mm |
| Pitch at 0.7 R | 485 mm (19.1 in) |
| Design speed | 730 rpm |
| Fluid speed at design point | 5 m/s |
| Thrust | 1006 N |
| Torque | 91.3 N·m |
| Shaft power | 6982 W |
| Propulsive efficiency | 0.72 |
| Material used in the computation | nickel-aluminium bronze (NAB) |
| Strength at design point | yes |
| K_T and 10·K_Q computed by Heliciel | 0.151 and 0.300 |
| J at maximum efficiency (Wageningen polynomials) | 0.899 |
| Open-water efficiency of the series at this J (polynomials) | 0.71 |
| K_T and 10·K_Q of the series at this J (polynomials) | 0.112 and 0.226 |
| Direction of rotation | right-hand |
| Files included | STL, STEP, HLC |
| Reference | N-457-4p-P483 |
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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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