The 2-blade series — 330–460 mm
Autoprop H20
Two blades, full self-pitching action. For smaller yachts and owners who want the simplest, lightest Autoprop.
The H20 carries the same free-pivoting blade principle as the rest of the range on a compact two-blade hub. It suits yachts whose apertures or preferences favour two blades, on shafts from 7/8" to 1½" (20–35 mm).
Two blades mean slightly less blade area than the H5 at the same diameter — on most small cruisers the difference is imperceptible, and the H20 feathers to an especially clean profile under sail.
Worth knowing: If your engine pushes the upper end of the power band, we'll often step you to the 3-blade H5 at the same diameter — the Builder works this out from your numbers.
Specification
| Blades | 2 |
| Diameters | 330 · 358 · 380 · 394 · 416 · 430 · 442 · 460 mm |
| Shaft range | 20–35 mm (⅞–1½″) |
| Rotation | LH & RH (twin sets available) |
| Material | Manganese bronze, zinc/aluminium anodes |
Final diameter is engineered from your power, max RPM, gearbox ratio and tip clearance — never off a chart alone.
Sizing
Series is the easy part. Diameter is the engineering.
Power, max RPM and gearbox ratio give shaft RPM; shaft RPM and power give optimum diameter; your aperture sets the ceiling. The Builder runs it in a minute — an engineer verifies it before supply.
Get the verified recommendation for your boat
Tell us your boat, engine and how you use it — a propeller engineer replies within one business day with sizing checked against the fitment database.