VAF instruments 667 - Page 43

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Specific Cylinder Oil Consumption rate (S.C.O.C.)
𝑺𝑪𝑶𝑪 =
𝑮 ∙𝟏𝟎𝟎𝟎
𝑷
(F15)
SCOC
= Specific Cylinder Oil Consumption
[g/kWh]
G
= Mass flow rate to M/E lubrication oil
[kg/h]
P
= Shaft power
[kW]
Ship efficiency
𝑭𝑶𝑪 =
𝑮
𝒗
(F16)
FOC
= Fuel Oil Consumption
[kg/Nautical Mile]
G
= Mass flow rate to M/E
[kg/h]
v
= Ship speed
[knots]
Thrust quotient
𝑻𝑸 =
𝑻
𝑷 / 𝟏𝟎𝟎𝟎
(F17)
TQ
= Thrust quotient
[N/kW]
T
= Thrust
[kN]
P
= Shaft power
[kW]
This quotient indicates the amount of thrust generated per MW propulsion power. The thrust quotient is
an indicator of propeller efficiency. Be aware that propeller thrust and ship speed influence each other.
Propulsive Efficiency
𝜼
𝑷
=
𝑷
𝒗
(F18)
η
P
= Propulsive efficiency
[kWh/NM]
P
= Shaft power
[kW]
v
= Ship speed
[Knots]