Propeller boss cap fins retrofit
vendor claim — not yet independently measuredSmall fins fitted to the propeller boss cap that break up the hub vortex behind the propeller, recovering rotational energy that would otherwise be lost. One of the cheapest propulsion retrofits, installed in a day or two during a scheduled docking.
2–5%
CO₂ emissions reduction
€40k–90k
indicative capex band (vendor/literature prior)
1–2 days
drydock required
14,642
candidate vessels (fitment unverified — equipment data cannot prove absence)
Which ships it suits
- Segments: Bulk carrier, Chemical tanker, Combination carrier, Container ship, Gas carrier, General cargo ship, LNG carrier, Oil tanker, Refrigerated cargo carrier, Ro-ro ship, Vehicle carrier
- Remaining service life: at least 5 years (payback must fit inside it)
- Engine: two-stroke main engines only
Candidate vessels — worst CII band first
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Measured real-world outcomes
The reduction range above is a vendor claim. We continuously detect completed retrofits in shipyard-visit, equipment and EU MRV emissions data and measure the actual AER change. Measured results are published per measure once at least 30 controlled observations exist — until then, treat vendor ranges as ceilings: real-world delivery is consistently at or below the low end.