Wind Propulsion Retrofit, Route Performance & Commercial Decision Support

Wind-Assisted Propulsion Sizing, Route Benefit, Deck Impact & Retrofit ROI Tool

Screen rotor sails, suction sails, rigid wings, soft sails, kites and other wind-assisted concepts against the vessel and route that must actually support them. Estimate route-averaged wind power, fuel and CO₂ savings, units required for a target saving, deck and air-draft impact, topweight effect, cargo interference, installation cost, payback and multi-year NPV.

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

Vessel & Fuel Baseline

Use actual performance data where available. WAPS savings are strongly route, wind, speed and vessel dependent, so the model keeps thrust and route effectiveness as user inputs rather than assuming a technology-wide fuel-saving percentage.

kW
g/kWh
g/kWh
$ / t fuel
tCO₂/t fuel
Enter the factor appropriate to the fuel and accounting boundary being screened.
$ / tCO₂

Route & Wind Exposure

days/year
knots
%
Sea time where apparent wind angle and strength are useful for the selected system.
%
Average thrust within favorable periods relative to the entered representative favorable-condition thrust.
%
%
Planning allowance for aerodynamic interaction, control limitations and non-ideal installation effects.

Route Segment Performance Schedule

Use separate trading legs when wind opportunity differs materially by geography or season. Seed values are illustrative placeholders only, not route climatology.

Route / segment Sea days Speed kn Propulsion kW Favorable wind % Thrust realization % Availability %

WAPS Sizing & Parasitic Load

kN
Use vendor or vessel-specific force-matrix data when available.
kW
%

Deck, Air Draft & Stability Screen

m²
m²
m²
Allowance for hatch access, movement, safety zones, cargo gear or deck operations.
t
t
t
m
m above keel
m
m
m
t cargo
$

Retrofit Cost & Operating Economics

$
$
$
$
days
$ / day
$
$
hours/year
$ / hour
years
%
Screening tool, not WAPS approval or performance certification: Final installations require vessel-specific aerodynamic / force modelling, structural assessment, stability review, navigation and visibility checks, operating limits, safety management, class / flag review and verification of actual in-service performance. This tool does not calculate an IMO-certified Pwind, EEDI or EEXI credit.
Research-informed structure: Current marine WAPS guidance emphasizes vessel-specific performance, structural foundations and supporting hull structure, stability, visibility / navigation, cargo-operation interaction, air draft and operational safety. Recent full-scale verification also shows that savings can vary substantially by voyage and wind conditions, reinforcing the need for route-specific modelling and in-service verification. IMO is continuing work on wind-propulsion safety provisions, while recognized organizations have established WAPS guidance and classification frameworks. Research basis includes IMO SDC 12 / MSC work on wind safety, IMO energy-efficiency guidance, Lloyd's Register WAPS guidance and retrofit case studies, LR / Anemoi in-service verification work, and the Maritime Technologies Forum 2026 WAPS safety-management guidelines.
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