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Squat - Coggle Diagram
Squat
\( F_D \) (Depth of Influence Coefficient)
If \( \cfrac{H}{T} \) > \( F_D \)
Resistance do not alter
Speed remain constant
Propeller rev steady
squat remain unchanged
DEEP WATER CONDITIONS
H - Depth of Water
T - Mean draught
If \( \cfrac{H}{T} \) < \( F_D \)
SHALLOW WATER CONDITIONS
Resistance increase
Speed reduce
Propeller rev reduce
Squat will increase
\( F_D \) According to ship
Supertanker - 5,68 x T
General cargo - 7,07 x T
Passenger - 8,25 x T
Ro-Ro - 9,20 x T
Leander Frigate - 12,04 x T
Indica se entrou em Shallow Waters
Quanto maior, mais fundo vai sentir squat
5 Main Factors Affecting Squat
\( V_K \) - SOG
Squat varies with \( V_K^2 \)
\( C_B \) - Block coefficient
Higher \(C_B\), higher squat
\( \dfrac{H}{T} \)
\( \dfrac{H}{T} \) decreases, increases squat
Lateral Canal banks
Crossing vessel
presence of another ship
Características que afetam a SENTADA - TAMANHO da boyzinha, VELOCIDADE, poltrona ou BANCO, PRESENÇA DE OUTRO CRUZAMENTO e qualidade HT.
4 Indications of Shallow waters
Wave making increases at foward end
Vessel becomes sluggish to maneouvre
Vibrate and cause resonance
Rolling, Pitching and Heaving DIMINUEM
Indicação de buceta RASA - AMPLITUDE DOS MOVIMENTOS DOMINUI, VIBRA E GRITA, fica MOLE no final, DÁ ONDA NA CABEÇA
Stationary Vessel
Moored vessel
Ebb Tide
Alongside jetty
AGACHAMENTO
Forward Motion
Algebraic Sum
Trim
Decrease of UKC
AFUNDO
NOT the difference
between draught readings
Underway
Stationary