Why Do Some Ships Use Vertical Propellers?
The video explains the Voy‑Schneider vertical shaft propeller (VSSP), a disc‑mounted, vertically oriented propulsion system that can vector thrust in any direction without turning the entire unit. Unlike conventional horizontal shafts, the VSSP’s disc spins at constant speed while each blade’s pitch is continuously varied via a hydraulic control rod and kinematic linkages. By adjusting blade angles, the thrust can be directed forward, aft, sideways or even held at zero, eliminating the need for a rudder or engine reversal. Tug captains operate the system with three controls—steering wheel, pitch levers and engine RPM—allowing precise station‑keeping and lateral moves. The example tug uses two 2,700 kW diesel engines driving opposite‑rotating VSSPs through vibration‑absorbing couplings, demonstrating the setup’s power and flexibility. Because the mechanism is mechanically complex and less efficient at high speeds, VSSPs remain confined to vessels that value low‑speed maneuverability, such as tugs, ferries, research ships and ice‑breakers, while most bulk carriers and tankers continue to rely on conventional screws or modern azimuth thrusters.
Why Red and Green Buoys Can Mislead You?
The video breaks down the international buoy system that tells mariners where water is safe, where hazards lie, and how to interpret red and green lateral marks. While the COLREGS set the rules of the road at sea, they stop...
What Keeps A Catamaran Stable?
The video explains why catamarans are both praised and critiqued for their stability, highlighting how their twin‑hull configuration influences rolling, pitching, and overall seaworthiness. While the wide separation of two slender hulls virtually eliminates side‑to‑side roll, the same narrow sections reduce...
How Liquified NATURAL GAS Tankers Work
Liquefied natural gas (LNG) carriers are purpose-built vessels featuring large spherical, heavily insulated tanks that store LNG at about -62°C to keep it in liquid form during long voyages. The extreme cold and risk of vaporization—LNG expands roughly 600 times...
What You Don't Know About Modern Sail Ships
The video spotlights a renaissance in wind‑propelled shipping, where lightweight carbon‑fiber yachts and commercial vessels are leveraging cutting‑edge sail geometries, vertical‑axis rotors and high‑altitude kites to sail closer to the wind than ever before. Modern yachts now sport tall,...
How To Fight FIRE in a Cruise Ship
The video details emergency response to a balcony fire aboard a cruise ship, describing how crews tackled the blaze using specialized equipment and tactics. High‑fog suppression system contained flames to balconies but did not clear smoke, forcing firefighters in full breathing...