How To Calculate Parallel Rise

PR = w / TPI  (English System)

PR = w / TPC (Metric System)

w = weight discharged

How To Calculate Squat

Squat / Sinkage

Open Waters:

S = Cb x  v² / 100 (Metric System)

S = Cb x v² / 30 (English System)

Shallow Waters:

Sinkage/Squat in Open  Waters x 2
 

S = (Cb x  v² / 100) x 2 (Metric System)

S = (Cb x v² / 30) x 2 (English System)

V = Ship’s Speed

Cb = Block Coefficient

How To Calculate Wheel Over Position

Example:

Present Course: 300 Degrees

Next Course: 330 Degrees

Course Difference: 30 Degrees

Your Desired Rudder Angle: 10 Degrees

Constant: 12

Solution:

WOP = ((30/10) x 12)/60 Minutes

          = 0.6 Nautical Miles

Cargo To Load Calculation

Summer Displacement

+

Lightship

=
Deadweight
-

Non-Cargo weight ( FO, Ballast,  FW, Constant)

=

Cargo To Load

How To Calculate Ship’s Displacement

Cargo

+

Ballast

+

FO, FW, Bunkers, Constant

=

Deadweight

+

Lightweight

=

Displacement

How To Calculate Quarter Mean Draft

QMD = ((Midship Draft x 6) + Corrected Draft Forward + Corrected Draft Aft) / 8