Seafarer's Place

Thursday 20 March 2014

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

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

Summer Displacement

Lightship

=
Deadweight
-

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

Cargo To Load

Cargo

Ballast

FO, FW, Bunkers, Constant

Deadweight

Lightweight

Displacement

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