Wake Recovery, Propeller Inflow, Post-Swirl Recovery & Retrofit Economics

Propeller Energy-Saving Device Retrofit Selection, Fuel Savings & ROI Tool

Screen propeller boss cap fins, pre-swirl fins and stators, ducts, rudder bulbs and fins, propeller optimization, wake-improvement devices and combined packages. Translate a vessel-specific hydrodynamic savings estimate into annual fuel, power and CO₂ reduction, test whether the device fits the vessel's operating profile, build retrofit and off-hire cost, compare candidates, and calculate payback, NPV and break-even savings.

Currency
Currency selector changes display only. No exchange-rate conversion is performed.

Vessel & Propulsion Baseline

Use measured main-engine fuel consumption and the vessel's actual operating profile where possible. The tool does not assign a generic fuel-saving percentage to any device type.

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Device & Savings Case

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Enter the vessel-specific CFD, model-test, supplier or trial estimate you want to screen.
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Use when another propeller, hull or ESD measure may claim part of the same hydrodynamic saving.
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Energy-Saving Device Candidate Register

Compare multiple concepts on one vessel. All savings values are editable project assumptions, not embedded performance claims. Zone identifies whether the concept acts mainly before the propeller, at the propeller / cap, behind the propeller, or across multiple locations.

Candidate Zone Gross save % Applicability % Realization % Confidence % Overlap % CAPEX Extra off-hire d Maint / yr

Vessel Hydrodynamic Fit Screen

These scores do not predict fuel saving. They help expose whether a device deserves deeper hydrodynamic study on this specific ship.

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Economic Treatment

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Hydrodynamic screening only: This tool is not class-approved, OEM-certified, CFD, model-test, cavitation, shafting, torsional-vibration, structural, rudder-load or sea-trial analysis. Device savings depend on the actual hull, wake field, propeller, rudder, draft, speed profile, loading pattern and interaction with other efficiency measures. Final selection should use vessel-specific hydrodynamic analysis and an agreed performance-verification method.
Selection principle: Propulsion-improving devices can act upstream of the propeller, at the propeller or boss cap, downstream around the rudder / slipstream, or as a combined package. The highest-value retrofit is not necessarily the device with the largest quoted saving. Vessel fit, interaction with the existing propeller and rudder, operating profile, cavitation margin, installation timing and evidence quality should be considered together. Check current class, flag and EEXI / technical-file implications for the actual modification.
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