## What is LCF in stability?

Center of Floatation (LCF): This point is the centroid of the area of the water plane, and is called the center of the floatation. The distance of the center of floatation is read with respect to either of the perpendiculars or the mid-ship, and is abbreviated as LCF.

**How is LCF of a ship calculated?**

Recompute the LCF draft, by using the LCF value just obtained into the following formula: TLCF = TM + (TRIM)LCF / L. The LCF just obtained should be close to the one previously calculated.

**What are the 3 types of ship stability?**

There are three types of equilibrium conditions that can occur, for a floating ship, depending on the relation between the positions of the centre of gravity and centre of buoyancy….Intact Stability of Surface Ships:

- Stable Equilibrium: Study the figure below.
- Neutral Equilibrium:
- Unstable Equilibrium:

### What is GML in stability?

The metacentric height (GM) is a measurement of the initial static stability of a floating body. It is calculated as the distance between the centre of gravity of a ship and its metacentre. A larger metacentric height implies greater initial stability against overturning.

**What is TPC in ship stability?**

The Tonnes Per Centimetre Immersion(TPC) for any draft is the mass which must be loaded or discharged to change a ship’s mean draft in salt water by one centimetre.

**What is MCT of ship?**

MCTC or MCT 1 cm (Moment To Change Trim By One Centimetre) is the moment required to change the total trim of the vessel by one centimetre. MCTC = [W x GM(l)] / [100 x L] COB (Centre of Buoyancy) is the geometric centre of the underwater volume of the ship.

#### What is MTC in ship stability?

L. ) Moment to Trim One Degree and Moment to Trim One. Centimeter (MTC)

**What is a GZ curve?**

The curve of statical stability, or GZ curve as it is most commonly referred to, is a graphical representation of the ship’s transverse statical stability.

**What is floodable length?**

Floodable length means the length of a shell to shell segment of the vessel that, when flooded, will sink and trim the vessel until the margin line is tangent to the waterline.

## What is TPC in ship?

This chapter discusses tonnes per centimeter (TPC) and displacement curves. The TPC is the mass that must be loaded or discharged to change the ship’s mean draft by 1 cm.

**What is DWA and FWA?**

By. The Fresh Water Allowance is the number of millimetres by which the mean draft changes when a ship passes from salt water to fresh water, or vice versa, whilst floating at the loaded draft. FWA(in mm) = Displacement (in tonnes)/(4*TPC)

**What is TPC and MCTC?**

TPC= (1.025 x area of ship’s water plane) / 100. MCTC or MCT 1 cm (Moment To Change Trim By One Centimetre) is the moment required to change the total trim of the vessel by one centimetre. MCTC = [W x GM(l)] / [100 x L] COB (Centre of Buoyancy) is the geometric centre of the underwater volume of the ship.

### What is RM in ship stability?

RIGHTING MOMENT (RM) The Righting Moment is the best measure of a ship’s overall stability. It describes the ship’s true tendency to resist inclination and return to equilibrium. The Righting Moment is equal to the ship’s Righting Arm multiplied by the ship’s displacement.

**What is MCT 1 cm?**

The Moment to Change Trim 1 cm (MCT 1 cm or MCTC) The MCT 1 cm, or MCTC, is the moment required to change trim by 1 cm, and may be calculated using the formula: where. The derivation of this formula is as follows: Consider a ship floating on an even keel as shown in Figure 18.3(a). The ship is in equilibrium.

**What is GM curve?**

Since the stability of a ship can be directly commented on by the nature and value of its metacentric height (GM), a direct method to track the stability of a ship for a range of heel angles would be, to generate a curve that relates this parameter to the angle of heel.

#### What is KN curve?

KN Cross Curves of Stability In some cases the curves are constructed for an assumed KG of zero. The curves are then referred to as KN curves, KN being the righting lever measured from the keel. Figure 21.3(a) shows the KN curves for an imaginary ship called the M.V. ‘Cargo-Carrier’.

**Why margin line is 76mm?**

If the bulkhead deck submerges, openings on the top of the bulkhead deck which are not watertight may submerge and lead to progressive flooding. To achieve this aim and for a margin of safety a margin line is drawn at least 76mm below the bulkhead deck.

**What is margin line?**

Definition of ‘margin line’ 1. an imaginary line used in making calculations regarding the flooding of hulls, running fore-and-aft 3 in. ( 8 cm) below the upper surface of the bulkhead deck at the side. 2. the line along which the planking on a transom-sterned vessel terminates aft.

## What is DWT in shipping?

Deadweight tonnage is a measurement of total contents of a ship including cargo, fuel, crew, passengers, food, and water aside from boiler water. It is expressed in long tons of 2,240 pounds (1,016.0469088 kilograms).

**What is GZ curve?**

GZ Curve is a curve indicating the transverse distance between the centre of gravity (G) and centre of buoyancy (B) in a condition when the vessel is heeled to a certain angle. The shipyard provides the information to calculate GZ for various angles of heel and for various displacements.