The Admiralty Coefficient (C) is a method for estimating the propulsion power needed for a newly built ship. It's considered relatively constant for a given ship design. The formula is:

$$C=\frac{\Delta^{2/3}\times V^3}{BP}$$

Where:

• C = Admiralty Coefficient
• Δ = Displacement in tonnes (weight of the ship when fully loaded)
• V = Speed in knots
• BP = Brake power in kilowatts (power delivered by the ship's engine)

A higher Admiralty Coefficient indicates a more efficient ship design, meaning it requires less power to achieve a given speed. Values typically range from 350 to 600.

Fuel Coefficient:

The Fuel Coefficient (F.C.) is used to calculate a ship's daily fuel oil consumption. The formula is:

$$Daily\:fuel\:oil\:consumption\:=\:\frac{\Delta^{2/3}\times V^3}{FC}$$

Where:

• F.C. = Fuel Coefficient
• Δ = Displacement in tonnes
• V = Speed in knots

The Fuel Coefficient can vary significantly, with typical values ranging from 40,000 to 120,000. A higher Fuel Coefficient implies greater fuel efficiency (lower daily fuel consumption) for a given speed and displacement.