Pivot Point in Ship Handling for Safer and More Accurate Ship Maneuvering

Ship Maneuverability of Very Large Ships

Ship Maneuvering in Head and Countering Seas

Ship Maneuvering in Restricted Waters Anchor Work

Ship is Sailing in Following and Quartering Seas

Broaching-to is a dynamic phenomenon due to the loss of control in severe following or quartering seas. The ship enters into a forced turning that cannot be corrected by the rudder, heels, and capsizes.

Severe seas of any kind are dangerous if you are not prepared. You should take special care in the following situations. In beam seas, excessive roll can cause cargo to shift, creating a dangerous list. This could cause the vessel to capsize. Strong breaking waves could also capsize the vessel. In following seas, a vessel may lose stability on a wave crest. If the vessel is overtaken by a wave crest, broaching may occur. In quartering seas, the problems of beam and following seas are combined. Quartering seas represent the most dangerous situation in severe weather.

Harbor Ship Handling

Behavior of Ships in Shallow and Restricted Waters

Ship motions in open waters and waves are always dynamic and most of the time are nonlinear. Even though behavior of ships in shallow and restricted waters does not sound as violent at first thought, it is equally important in terms of capsizing. There has been so many casualties reported that claimed so many lives. In this study, squat phenomenon is dealt with especially addressing its determination in the preliminary design stage. For this purpose, approximate formulae have been proposed to predict bow squat of ships and compared with the other methods and experimental data found in the literature to come up with a pragmatic method to guide naval architects and masters towards avoiding excessive squat in shallow water. It is known that forward speed plays an important role in squat, hence there exist a Froude number, called critical speed, for a particular ship at which squat characteristics start changing drastically. This fact is also taken into account in the regressional analysis. Some of the results are then compared with that of the similar studies and a real life incident. It has been found that the method compared fairly well with other methods and experiments.

How Bank Effects Ships in Restricted Waters - What is bank effect of a ship?

How Bank Effects Ships in Restricted Waters - What is bank effect of a ship ?

Ship Handling and Maneuvering of Ro-Ro Ships

Ship Handling and Maneuvering of Ro-Ro Ships

Propulsion And Manoeuvring Systems

This video will give you a general overview of the most common propulsion and manoeuvring systems used to day.

Manoeuvring Characteristics.

The traditional rudder and propeller system.

Motor ship – Low speed diesel engines.

Motor ship – Medium and high speed diesel engines.

Turbines.

Controllable pitch propeller (CPP).

Ducted propellers.

The conventional rudder profile.

Rudder balance.

Rudder designs.

Other rudder designs.

Operational aspects.

Twin schilling rudders.

Turning diagram for twin schilling rudder.

Conventional single screw arrangement.

Accurate and predictable turning manoeuvres.

Turning with constant rate of turn.

Calculation of rate of turn (ROT).

Turning with fixed turn radius.

Marine Useful Manoeuvres

This video will provide you with a basic introduction to some useful standard manoeuvres

Useful manoeuvres.

Pilot boarding arrangement.

Picking up a pilot.

Picking up a pilot in rough weather.

Pilot by helicopter.

Man over board.

The single turn.

The scarecrow turn.

The Williamson turn.

Man overboard – Immediate action.

Search patterns.

Re-supplying and transfers at sea.

Manoeuvring Characteristics And Interaction

This video will provide you with basic understanding of typical maneuvering characteristics for different ship types.

Ship steering.

Maneuvering information.

Turning circles.

Comparison of turning circles – loaded/ballast.

Passenger ferry – turning and stopping parameters.

Bulk carrier – turning and stopping parameters.

VLCC – Turning and stopping parameters.

Shallow water influence.

Squat.

Zig Zag test.

Emergency stopping.

Launching and recovery of boats.

Helicopter operations.

Forces Involved During Manoeuvring and Sailing of Ships

This video will provide you with a general overview of the forces involved during maneuvering and sailing of ships.

Bernoulli’s Law.

Forces.

The pivot point.

The turning.
lever and moment.

The rudder force.

Ship handling in practice.

How to obtain relevant information.

Ship maneuvering ability.

The professional ship handler.

What is ship handling?

This video will provide you with a short introduction to basic ship handling and an elementary understanding of the forces involved.

Merchant ship design principles.

Steering control.

What is ship handling?

Ship handlers.

Ship handling simulators.