Ship Construction & Naval Architecture

01 Ship Stability & Metacentric Height (GM) Demystifying transverse stability, the righting lever (GZ), and why stiff ships snap while tender ships linger. Intermediate · 7 min read · 5 sections 02 Free Surface Effect (FSE) & Angle of Loll Why slack liquid tanks cause virtual loss of stability, and how an initially unstable ship flops into an Angle of Loll. Intermediate · 8 min read · 5 sections 03 Bulbous Bow & Wave Cancellation Physics How a submerged underwater bulb generates a counter-wave to cancel bow waves, slash hull drag, and save tons of fuel. Intermediate · 6 min read · 4 sections 04 Dynamic Hull Stresses: Panting & Pounding How ships survive violent wave slamming and pulsating hydrodynamic pressure with heavy structural reinforcements. Intermediate · 7 min read · 4 sections 05 Ship Keels & Bilge Keel Construction How flat plate, bar, and duct keels form the backbone of modern vessels, and why bilge keels use sacrificial ground bars for roll damping. Intermediate · 7 min read · 4 sections 06 Watertight Bulkheads & The Collision Bulkhead How transverse watertight subdivision, collision bulkheads, and corrugated plate geometry prevent catastrophic ship flooding. Intermediate · 7 min read · 5 sections 07 Hatch Covers, Coamings & Weathertight Sealing Coaming scantlings, compression bar gaskets, resting pads, single pull / folding configurations, and surveyor ultrasonic testing. Intermediate · 8 min read · 5 sections 08 Double Bottom Construction & Deep Tanks Transverse vs. longitudinal framing, solid plate vs. bracket floors, tank margin plates, and deep tank hydrostatic head testing. Intermediate · 8 min read · 4 sections 09 Watertight Doors: Types, Mechanics & SOLAS Regulations Vertical and horizontal sliding mechanics, electro-hydraulic fail-safes, Class 1–3 SOLAS standards, and watertight vs. weathertight boundaries. Intermediate · 8 min read · 4 sections 10 Rudder Construction & The Rudder Carrier Bearing Conical thrust faces, rudder stock support, balanced vs. flap rudders, trammel gauge wear-down, and jumping clearances. Intermediate · 8 min read · 4 sections 11 Shaft Tunnel Construction & Line Shaft Bearings Why the tunnel is offset from the centreline, how watertight ring stiffeners are graded, and how shaft stools transfer loads into the double bottom. Intermediate · 8 min read · 4 sections 12 Methods of Reducing Rolling: Fin, Bilge & Tank Stabilisers How active fins, bilge keels, and passive/active tank stabilisers fight synchronous roll and why tank water must be tuned to GM. Intermediate · 8 min read · 4 sections 13 Torsion Box, Racking & Hull Twisting Why a 45° oblique wave twists an open-deck container ship, how the torsion box girder resists it, and why tankers need no such stiffening. Intermediate · 8 min read · 4 sections 14 Standard Fire Test & Class A / B / C Divisions (Thermal Bulkheads) How the standard time-temperature curve grades bulkheads, the 140°C/180°C/225°C limits, and why fire-rated divisions are called thermal bulkheads. Intermediate · 8 min read · 4 sections 15 Anti-Heeling System: Operation, Types & Safety How a ship auto-detects heel and transfers ballast to stay upright, and the difference between pneumatic and pump systems. Intermediate · 7 min read · 4 sections 16 Enclosed Space Entry: Safe Procedure & Permit to Work The fatal hazards of confined spaces, gas testing to 21% oxygen, and the permit, standby and rescue rules that keep crews alive. Intermediate · 8 min read · 4 sections 17 Bilge Holding Tank Cleaning & Safe Entry Sound the tank, discharge legally via the 15 ppm OWS or slop tank, log the ORB, then clean only under full enclosed-space precautions. Intermediate · 7 min read · 4 sections 18 Propeller Fitting: Procedure & Securing to the Shaft How the propeller is checked, dry-fitted, lapped to the shaft taper, keyed, locked and protected — step by step. Intermediate · 8 min read · 4 sections 19 Types of Crude Oil: Sweet vs. Sour Crude How H2S and sulphur content separate sweet from sour crude, and what that means for corrosion, processing and safe carriage. Beginner · 6 min read · 4 sections 20 Sounding Pipe Regulations & Safety Features SOLAS rules on sounding pipes, the 32 mm and 65 mm diameter limits, striking plates and self-closing sounding caps. Intermediate · 6 min read · 4 sections 21 International Shore, Bilge & Sewage Coupling Dimensions The standard flange dimensions for the international shore connection, bilge coupling and sewage coupling every surveyor expects you to know. Beginner · 6 min read · 4 sections 22 Ship Dimensions & Basic Naval Architecture Definitions The surveyor's vocabulary: principal dimensions, form coefficients, propeller slip terms, and hull plating names. Beginner · 10 min read · 4 sections 23 Chain Locker, Bitter End & Anchor Cable Arrangement Where the chain is stowed, how the bitter end is secured, and the spurling/hawse pipe path that leads the cable to the water. Intermediate · 7 min read · 4 sections 24 Cruiser & Transom Sterns, Cant Frames & Frame Spacing How the stern overhang is stiffened, and the frame spacing rules a surveyor expects: 1 m, 760 mm and 610 mm. Intermediate · 7 min read · 4 sections 25 Bow Thrusters: Construction, Drive Types & Operation The transverse tunnel that pushes the bow sideways — how it is built, driven and protected from cavitation. Intermediate · 6 min read · 4 sections 26 The Propeller Shaft: Bearings, Couplings & Propeller Drop From flywheel to propeller: forged shafting, fitted bolts, white metal bearings, stern tube lip seals and the Pokers gauge. Intermediate · 7 min read · 4 sections