486–590 mm — for 45–55 ft yachts
Autoprop H6
The mid-heavy series: bigger blades, bigger bearings, shafts from 1¼ to 1¾ inches.
The H6 takes the Autoprop principle up the displacement curve — Oysters, Amels, Moodys, big Jeanneaus and Beneteaus, deck-saloon cruisers and serious offshore boats.
At these displacements the fuel arithmetic gets interesting: 20% of a 75 hp engine's cruise burn over a Pacific season is measured in thousands of dollars, not hundreds.
Worth knowing: H6 sizing runs closer tolerances on tip clearance — the Builder asks for your aperture measurement and we verify it before supply.
Specification
| Blades | 3 |
| Diameters | 486 · 504 · 534 · 566 · 590 mm |
| Shaft range | 30–45 mm (1¼–1¾″) |
| 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.