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Squat - Coggle Diagram
Squat
Barrass Formula accurate for VLCC
\(S[m]=C_b \times \dfrac{V^2}{100} \)
\(S[ft]=C_b \times \dfrac{V^2}{30} \)
On meetings
Increases BTW 50% to 100%
Sum of the 2 vessels Squat
Will be the result for each vessel
Effect of restriction (blockage factor)
depends on
Speed^2 (through water)
Ratio of Ship Draft / Depth
Blockage Factor - Ratio of Ship Area / Channel Area
Ship Block Coeff
Displacement
Rate and period of acceleration
Shallow Waters
S = 2 x S
UKC < 0,5 Draft
More Directionally Stable
More difficult to turn
Great Cb (>0,75) ships
usually Trim by Head
Acceleration
Increases Squat almost 2x
Overtaking
No much Data
Assume is same or greater than meeting
Twists more
in shallow water