(c) MCA_Orals
Home

Links

This site is run by sponsorship
To sponsor , contact me here

Ships Stability Made Easier

The word "Stability" means if the vessel is heeled by an external force it has the ability to right herself whether its transverse, statical or longitudinal stability.

From Author - Make sure you know whats in the stability book before going for an Oral Exam

Most vessels have a stability book and a common question from the captains is what are the loading conditions in a stability book, this can vary for different vessels, best to have a look and see how many loading conditions you have, this is an example


(1) The bare vessel without any stores or weights before going to sea
(2) The vessel loaded ready to go to sea
(3) Fishing vessels when they arrive at their fishing ground
(4) When they finish their fishing trip with 20% maximum catch onboard before leaving the fishing grounds
(5) Before they arrive in harbour with 20% maximum catch
(6) When they finish their fishing trip with 100% maximum catch onboard before leaving the fishing grounds
(7) Before they arrive in harbour with 100% maximum catch


Every vessel must check their vessels if taking a heavy load onboard to make sure the vessel does not become top heavy, making the Centre of Gravity to rise up maybe above the Metacentre giving the vessel a capsizing lever.

Caution must be maintained regarding a vessels stability when working North in winter months, Ice accretion can easy catch an experienced seaman out, never let ice accumulate on your vessel, this will give you an angle of loll.


Cargo vessels have to make sure they can carry any materials by working out the area they have in their hold and working out the mass of the material they're going to be taking aboard to make sure they can take that material, every material has different masses

Fresh water has a mass of 1.000t per metres cubed
Sea water has a mass of 1.025t per metre cubed
These figures are important for summer and winter loadlines on cargo vessels
While coming into port with a fresh water river, if the vessel has been loaded up to her maximum loadlines in a port that has sea water she will sink in a port with fresh water.


If your doing modifications to your vessel, get a stability captain down to make sure your vessel is safe to go to sea, your altering the vessels stability, you might capsize.


A lot of vessels have been lost because of the effects of F.S.E.(Free surface effect) F.S.E. makes your vessels GM smaller and is very dangerous
Try this for a demonstration of F.S.E.
Place a half full plastic lemonade bottle on the flat of your hand
don't grip the bottle and let the liquid move slowly
It will fall off your hand
Imagine what this does to a vessel!!!!!!!!!!!!!!!!
Keep F.S.E. to a minimum.
Keep all water tight doors and hatches closed while at sea.
Keep the bilge's dry.
Never let freeing ports to become blocked.
When at sea, never turn your vessel with any quantity of water on your deck.


You have to now the stability criteria for your vessel,
(1) Area under curve up to 30 degrees not less than 0.055 metres radians
(2) Area under curve up to 40 degrees not less than 0.09 metres radians
(3) Area between 30 and 40 degrees not less that 0.03 metres radians
(4) Maximum Gz to occur at an angle not less than 25 degrees but maximum Gz should occur at an angle exceeding 30 degrees
(5) Initial GM not less than 0.35 m for fishing vessels and 0.15 metres for merchant navy vessels
A radian equals 57.3 degree's

MCA Orals (Certificate of Competency)

Sponsored by
Thomas Gunn navigation services ltd

 

Actual Oral Exams sent from Candidates

Site Map

(C) MCA Orals
Home

Visit The Forums

Last update -24th April 2008 - Photo Gallery of History of Fraserburgh

Check the "Actual Oral Exams" above for important information
(Website sponsored by Thomas Gunn Navigation Services Ltd)
Any View or Opinions expressed are those of the Author and may not be supported by
Thomas Gunn Navigation Services Ltd

O.O.W. /Chief Mates/ Masters / Class 1 & 2 Fishing Skippers M.C.A. Education Website

Introduction

M.C.A. Oral Exam introduction

Website Recommendations

Award Winner

Questions about Rules of the Road


Lifesaving

Liferafts

Launching Liferafts

Contents of a liferaft

Lifejackets

Inflatable lifejackets

Speedline

E.P.I.R.B.

S.A.R.T.'s

Tips of the Day

Search and Rescue


Situations asked during M.C.A. Oral Exam

Various situations

Man Overboard

Flooding Prevention

Bilge Pumping

You've put your vessel aground

Why a vessel can go aground

Collision with another vessel

Marine Pollution

Ways to send a Mayday

Buoys and Buoyage systems

Health & Risk assessment

Ice Accretion

Safe Watch Keeping

Skippers Standing Orders

Entering an Enclose space

Galley Fire

Engine-room fire

Fire in DryDock

Emergency Anchoring

Caught in a Storm

Accidents at sea

Helicopter highline rescue

Red Distress Flare Spotted


Ships Stability

Ships Stability Information

Stability Definitions

Stability Formulas

Stability Sums made easy

Equilibrium

Stability Dangers

Why overfill your vessel?

Calculate Stability Curve


Radar

Radar Plotting Made Easy

Radar Displays

Radar Information

Racon Beacons


M Notices, MGN's, MIN's, MSN's & Statutory Instruments

M.G.N's

M.I.N.'s

M.S.N.'s

Statutory Instruments

MGN 20 - Risk Assessment

MGN 40 - I.S.M. Code

MGN 165- Flooding in fishing vessels

MGN 84 - Safe Watch Keeping

MGN 166 - Passage Planning

MGN 168 - The Marking of Seismic Streamers

MGN 172 - Fishermen'sPilot Book |

MSN 1676 - life saving appliances


Merchant Navy Section

I.S.M. Code (MGN 40)

I.M.D.G. Code (Diesel Oil)

I.M.D.G. Code (Dry Ice)

Rule of thumb for containers

Dangers working with containers

S.O.P.E.P.

S.M.P.E.P.

Grain Work

Dock Water Allowance

Load lines


Chartwork / Compass work / Azimuth Mirror / Passage Planning / Sextant

Chart work

Compass Work

Azimuth Mirror

Passage Planning

Sextant

How to find GMT

Mercator Sum

Polaris Navigation Sum

Sun Azimuth Navigation Sum


Checklists

Deck Checks

Wheelhouse checks

Hanging Block Checks

Deck Machinery Checks

Ships Documentation Checklist

Bilge Pumping checks

Engine Room Checks

Bunkering Checklist

Fire-fighting appliances checklist

Lifesaving Appliances checklist

Stability Checklist

Hanging Block Checklist


Light Recognition (Tips)

Light Recognition

Is the vessel Underway or What?

What is the vessels fog signal?

What is the vessels daytime signal(s)?

What are the arcs of the vessel(s) Lights

What are the dimensions of the vessels light(s)

Light Recognition questions

Pilot Vessels lights questions


Alterations (Tips)

Manoeuvres with vessels in different situations

Alteration Tips

Rule 9 - Narrow Channels

Rule 10 - Traffic Separation Schemes

Rule 13 - Overtaking

Rule 14 - Head on Situations

Rule 15 - Crossing Situations

Rule 19 - Restricted Visibility Situations

Close Quarters Situations

Actions to Avoid Collisions

High Speed Ferries

Wig Aircraft


Photo Gallery

Aberdeen Fishing Vessels (A)

Ayr Fishing Vessels (AR)

Arbroath Fishing Vessels (AH)

Ballantrae fishing Vessels (BA)

Banff Fishing Vessels (BF)

Barrow Fishing Vessels (BW)

Beaumaris Fishing Vessels (BS)

Belfast Fishing Vessels (B)

Berwick on Tweed (BK)

Birds (Sea)

Blyth Fishing Vessels (BH)

Boston Fishing Vessels (BN)

Bridlington Fishing Vessels

Brixham Fishing Vessels (BM)

Buckie Fishing Vessels (BCK)

Campbeltown Fishing Vessels (CN)

Castlebay Fishing Vessels (CY)

Castletown Fishing Vessels (CT)

Cork Fishing Vessels (C)

Colchester Fishing Vessels (CK)

Dacon Scoop Exercise

Dartmouth Fishing Vessels (DH)

Deep Sea Fish

Disaster Photos

Douglas Fishing Vessels (DO)

Drogheda Fishing Vessels (DA)

Dublin Fishing Vessels (D)

Dumfries Fishing Vessels (DS)

Falmouth Fishing Vessels (FH)

Fast Rescue Craft

Faversham Fishing Vessels (F)

Fleetwood Fishing Vessels (FD)

Fraserburgh Fishing Vessels (History of) (FR)

Fraserburgh History (Scenery, Shops, Buildings and People)

Galway Fishing Vessels (G)

Goedereede Fishing Vessels (GO)

Goteborg Fishing Vessels (GG)

Grangemouth Fishing Vessels (GH)

Grimsby Fishing Vessels (GY)

Guernsay Fishing Vessels (GU)

Hamburg Fishing Vessels (HF)

Harlepool (HL)

Helicopters

Helsingor Fishing Vessels (H)

Ice (Bergs and Vessels icing up (Ice Accretion))

Inverness Fishing Vessels (INS)

Kings Lynn Fishing Vessels (LN)

Kirkwall Fishing Vessels (K)

Kirkcaldy Fishing Vessels (KY)

Lancaster Fishing Vessels (LR)

Leith Fishing Vessels (LH)

Lerwick Fishing Vessels (LK)

Lifeboats

Limerick Fishing Vessels (L)

Littlehampton Fishing Vessels (LI)

Liverpool Fishing Vessels (LL)

London Fishing Vessels (LO)

Lowestoft Fishing Vessels (LT)

Merchant Navy Vessels

Mammals

Montrose Fishing vessels (ME)

Newport Fishing Vessels (N)

Newry Fishing Vessels (N)

North Shields Fishing Vessels (SN)

Oban Fishing Vessels (OB)

Padstow Fishing Vessels (PW)

Peel Fishing Vessels (PL)

Penzance Fishing Vessels (PZ)

Peterhead Fishing Vessels (PD)

Plymouth Fishing Vessels (PH)

Portsmouth Fishing Vessels (P)

Sailing Vessels

Scarborough Fishing Vessels (SH)

Scenery at Sea

Shellfish

Skibbereen Fishing Vessels (S)

Sligo Fishing Vessels (SO)

Southampton Fishing Vessels (SU)

St. Ives Fishing Vessels (SS)

Stornoway Fishing Vessels (SY)

Stress of Weather

Sunderland Fishing Vessels (SD)

Tankers (Oil and Bulk Carriers)

Teignmouth Fishing Vessels (TH)

Troon Fishing Vessels (TN)

Tarbert Fishing Vessels (TT)

Urk Fishing Vessels (UK)

Ullapool Fishing Vessels (UL)

Veere Fishing Vessels (VE)

Waterford Fishing Vessels (W)

Wexford Fishing Vessels (WD)

Weymouth Fishing Vessels (WH)

Whitby Fishing Vessels (WY)

Whitehaven Fishing Vessels (WA)

Wick Fishing Vessels (WK)

Yarmouth Fishing Vessels (YH)

Port Letters


Oral Exams and Syllabuses

Oral Exams from Candidates | Merchant Navy Deck Officer Syllabus| Fishing Deck Officer Syllabus

eXTReMe Tracker