Engine Powering

From effective power to required engine rating

Input

kn
kN

Use the Resistance tool, or enter values here.

Propulsive efficiencies

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Margins

%
%

Typical: sea margin 15%, engine margin 10%. They compound.

Fuel consumption & endurance

Preliminary daily fuel use from SFOC; endurance and range from tank capacity.

g/kWh
t
n mile

Power chain

Fuel & endurance result

Power flow chart

  • • EHP = RT × V.
  • • ηD = ηH × ηR × ηO, with ηH = (1−t)/(1−w).
  • • Rated power = service power × (1 + engine margin).