Fixed-Pitch Propeller · Shaft Line & Propulsion
The Nakashima FPP 4500mm 5B is a fixed‑pitch, five‑blade propeller with a 4.5 m diameter, designed for low‑speed (≈110 rpm) marine propulsion and built from nickel‑aluminium bronze for high corrosion resistance.
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What our service work and the manufacturer documentation say about keeping this model running.
Inspect blades, leading and trailing edges, hub, root areas and attachment to the shaft whenever the propeller is accessible. Check for cavitation, impact marks, cracks, corrosion and evidence of movement at the shaft connection. After repair, verify geometry and balance using an approved propeller procedure. Refer to the manufacturer and class documentation for the exact figure for blade damage, pitch and repair limits.
Onboard spares are normally limited to shaft-hub sealing or fastening items; major blade or propeller replacement components are generally planned as shore or dry-dock spares.
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