Coefficient of Fineness of Waterplane Area (Cw)

This is the ratio of the ship's waterplane area to the area of a rectangle with the same length and breadth of the ship at the same waterline. It is given by:

$$C_{w}=\frac{WPA}{L\times B}$$

Where:

• Cw​ = Coefficient of fineness of waterplane area
• WPA = Waterplane area
• L = Length of the ship
• B = Breadth of the waterplane

Block Coefficient (Cb)

This is the ratio of the volume of displacement of a ship to that of a rectangular block having the same length, breadth, and draft as the ship. It is given by:

$$C_{b}=\frac{V}{L\times B\times D}$$

Where:

• Cb = Block coefficient
• V = Volume displaced by the ship
• L = Length of the waterline
• B = Breadth of the waterline
• D = Draft

Midship Coefficient (Cm)

This is the ratio of the cross-sectional area at the midship section to the product of the ship's beam (breadth) and draft. It is given by:

$$C_{m}=\frac{A_{m}}{B\times D}$$

Where:

• Cm​ = Midship coefficient
• Am​ = Cross-sectional area at midship
• B = Beam (breadth of the ship)
• D = Draft