Video

Spiral-Test -Manoeuvre for detailed identification of Yaw Stability using Samples of Cruise Ship

published on 29 September 2021 - 92 -

Show comment section |

Found on YouTube. Created by "ISSIMS - Innovative Ship Simulation". Originally published on 2021-09-01.

This video shows an introduction on the Spiral-Test-Manoeuvre and describes the procedure how to steer through this manoeuvre and measure the data needed. The results will be displayed in a characteristic diagram allowing to identify stable and unstable conditions and related, detailed information, e.g. spiral loop width and height, rudder angle of neutral effect. Samples of stable and unstable ship behaviour demonstrations will be shown by Fast Time Simulation using the SAMMON Planning tool. Finally, a discussion of of ship’s hull form with loading conditions and elements like appendages completes the overview on effects of Yawing stability.
The next videos to follow will demonstrate other manoeuvres (e.g. Pull-out Test and Zig-Zag Test) which are also helpful to identify and discuss the stability condition for ships and the different aspects contributing to yaw stability.

ISSIMS GmbH
Innovative Ship Simulation And Maritime Systems

What's your opinion on this?

Video How Ship Anchor Works? - Procedure For Anchoring a Ship at Sea

published on 11 July 2020

#Anchor #shipanchor #windlass Anchoring is one of the very frequent operations onboard ships. A number of variables and external factors influence the duration and location of an anchoring operation. While the type of seabed is of utmost importance during anchoring, soft muddy grounds or clay bottoms are best preferred. It should be taken care that the anchoring bottom is free of power lines, submarine cables, pipelines or rocks. Various methods on anchoring include consideration of...

Video Critical Ship navigation done with perfection

published on 31 January 2022

Video How port pilot sail out ship from the port? Grimaldi lines catania roro ship

published on 22 April 2022

In this video I will show you Grimaldi Lines Catania RoRo Ship

Video One rare video of berthing in China (Tianjin)

published on 20 May 2022

Video Harbor Pilots - They park big ships. This is how.

published on 30 September 2022

A harbor pilot has the difficult job of bringing ships into port. A candidate for Albay Yacht Club has invited me to document the process. I went with Jud, the harbor pilot.

Video How Cargo Ships Navigate the World's Most Treacherous Bay

published on 10 December 2025

Play World of Warships for Free! Click my link to join the battle and unlock exclusive rewards. https://wo.ws/SamEckholm For over 150 years, the San Francisco Bar Pilots have guided the world’s largest ships through one of the most dangerous stretches of water anywhere on Earth. In this episode, I'm taking you out to sea with the pilots to see what it actually takes to navigate these vessels through the Golden Gate. Follow Along Here: --------------------------------------------- 📸...

Video Effects of Ciclone in the ports

published on 14 July 2023

As praticagens que atuam no litoral atingido pelo ciclone extratropical estão em estágio de alerta, avaliando constantemente os efeitos da ressaca e as condições de segurança dos canais de acesso. O objetivo é evitar acidentes e minimizar os impactos na logística e operacionalidade dos portos.
Em São Francisco do Sul (SC), o gerenciamento da situação já ultrapassa 12 horas, monitorando lanchas, navios fundeados e enviando rebocadores para o cais. Em Itajaí (SC), a preocupação inicial...

Video Unberthing of a 23,000 gross tons tanker

published on 22 June 2020

The "Navig8 Axinite" is a 184 meter tanker. It is in loaded conditions. two tugs are used. The maneuver consists of backing out using 2 tugs and the ship´s engine, for about 2 and a half ship´s lenghts an then turning to port. After the turn, you can hear me talking with the captain about passing arrangements with an inbound vessel, (another tanker).

Article USCG Safety Alert on Handhold Stanchions

published on 14 February 2023

On February 9th, 2023 Unites States Coast guard issued a safety alert (04-22-CH1) in which attention is drawn to the correct positioning of handhold stanchions onboard of ships.