1. Home
  2. Videos
  3. ...
Video

Wind Balance on straight track with theory


published on 24 November 2020 -  449 -

Show comment section | 1
Found on YouTube. Created by "ISSIMS GmbH & Institute: Innovative Simulation".
Wind Balance on straight track - using SAMMON to learn the theory and the effect of rudder and drift to reach the balance in steady state equilibrium conditions on straight track. Limits of steerability will be shown and how turn under strong wind.
Wismar, Germany

Join the conversation...

Login or register to write comments and join the discussion!
Knud Benedict Germany
on 12 December 2020, 13:45 UTC

Dear Louis, I am very sorry that I could not be of help for you. Maybe I missed to underline in that movie that I was only focusing on the wind effect and took aside the small disturbances which need corrective steering – I found them not worth mentioning because I felt it would be self-understanding for professionals that this is obviously necessary. From my 45 years of experience in lecturing and simulator training for students to become navigators, and also for captains and pilots I know that there are two groups of professionals: those who are relying mainly on their “gut feelings” (and they can be very good at it), and those who try to understand the nature of processes and apply their knowledge to think ahead for avoiding critical situations (which you describes as “that made your hair stand on end”…) to be expected around the corner. And in that movie, I wanted to explain when bigger drift angle and another rudder angle is waiting for you after the next bend.
By the way: Your sample with the car is failing this most important effect I was talking about: If you would have very strong wind from abeam then even a car would need a drift angle and an additional steering wheel angle to compensate the wind effect – much stronger than the normal corrective steering you mentioned.
Finally I like to thank you for your offer to the academics / hydrodynamicists - I would be open for any remaining question and kind of ideas... Maybe you could have a look on our YouTube platform (search for ISSIMS) where are more movies which might be of help – the next one will be on wind effect on turning circles…
Best regards, Knud Benedict
[show more]
2

MP
Marko Purwin Lotsenbrüderschaft NOK II Kiel / Lübeck / Flensburg, Germany
on 1 December 2020, 12:50 UTC

Dear Louis,

I am an active marine pilot, and for me this video has a practical use! Therefore I would like to point out that you should not speak for everyone here ("basically this video tells us nothing at all"). I believe that the people on this platform are able to develop own opinions and assessments.

I have experience as an instructor and I know that it is a proven method to investigate effects first separately. Only after single effects/forces have been understood, it makes sense to become more complex (with your words "variable forces"). For example, if you want to train a boxer, you start with individual techniques and footwork before everything comes together in sparring. There are just different levels of professional development in training.

In our case of ship operations, mathematical theories and models make the difference between our ancestors in their rowing boats and today's modern technology. Such mathematical models are the accepted background of every modern simulation, no matter which manufacturer. In my opinion a denial of such models means the denial of scientific knowledge and stands for backward thinking.

If you have constructive ideas, questions and remarks, it could be an option for you to contact the author directly on youtube. Maybe he is even not aware that his video was posted here.

Capt. Marko Purwin
[show more]
1

LV
Louis Vest Houston Pilots, USA
on 26 November 2020, 16:01 UTC

If this is to be a forum for actual marine pilots there should be some practical use to a pilot for the information being presented. Basically this video tells us nothing at all. The basic failing point is that in an academic world one can put the rudder at a certain carefully calculated angle, hold that angle, and the ship will maintain course. Such an idea can only exist in a mathematical world. Variable forces constantly act on the ship nudging it one way or another and the heading must be corrected with opposite rudder to regain the course and then with a shift of the rudder to check the swing when the course is regained. This is a constant back and forth between the helmsman and the ship. Left only to her own devices the ship will get a little off, the forces change, she gets a little more off and you find yourself in a turn. If you think she will eventually find a stable heading you are mistaken. I have never tried it (being constrained by real world considerations), but if you leave the rudder in a constant position I suspect she will eventually settle into a large sine wave course many miles wide or a circle/oval turn. I know some that would quite quickly begin turning so fast that control of the vessel is lost.

For those who don't drive ships try driving your car with a constant steering position. Even on a desert road running straight and level for as far as the eye can see you can't just let go of the steering wheel and stay on the road. The driver is constantly making small adjustments.

Add to that the complications of narrow channels and an uneven bottom and you are already outside the known math models.

Lastly, every ship is different, every rudder is different and even the same ship can have an infinite variety of steering conditions depending on the current, wind, trim by the bow or stern and how deeply she is loaded. A pilot can come inbound on a ship and sail out the next day on the same vessel and she will steer totally differently.

If hydrodynamicists would like a useful project, give pilots a way to predict which ships will steer easily and which ones arrive at the sea buoy at the limit of controllability. I bet every pilot on this forum has had ships that made their hair stand on end. We only found out when making the first turn of the transit that she would begin turning sweetly but full over rudder was barely enough to stop her from turning. I have my ideas but it would be off topic. Let's see if any of the academics contact me about it.
[show more]
0

Read more...

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...

1

Video Critical Ship navigation done with perfection

published on 31 January 2022

0

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

0

Video Curso Maritime Pilot AND Pilotage Transportation – Safety and Sea Survival Training

published on 12 March 2024

ANPRA y la Escuela Naval de Aviación Naval presentan el curso "Maritime Pilot AND Pilotage Transportation – Safety and Sea Survival Training (MP-SISST)".
Este programa integral está diseñado para preparar a profesionales de la navegación con las habilidades necesarias para enfrentar los desafíos del mar con confianza y seguridad. Desde técnicas avanzadas de pilotaje hasta protocolos de supervivencia en el mar, este curso ofrece un enfoque completo y práctico para garantizar la seguridad y...

0

Article MARS-Report: Paltry PPU position predictor

by The Nautical Insitute - published on 18 August 2023

To monitor the vessel’s progress, the pilot had set up his portable pilotage unit (PPU). He had connected the rate-of-turn generator to the vessel’s pilot plug and had set a variable range marker on the radar with a radius of 0.5 nm.

0

Article Next-level shiphandling simulation using VR

by Captain, MSc. Remko Fehr - published on 13 December 2023

Kiel Pilots introducing Morild Interaktiv AS Virtual Reality Simulator for next-level manoeuvring training.

1

Opinion Pilot ladders: Compliance by design, failure by operator

by Herman Broers - published on 10 March 2022

It is not often that this blog is used to show bad practice, however in this case some pictures tell a whole story. Ship is compliant by design for rigging a combination. How about the operator(s)?

1

Video Ex chief pilot of Bremerhaven harbor pilots on 400 meter ships (German with subtitles)

published on 1 February 2023

Matthias Meyer was head of the Bremerhaven port pilots, nautical expert and lecturer at maritime schools. In front of our camera, he voices what has long been a topic of discussion in shipping circles: that the 400-meter container ships have simply become too big for the narrow shipping channels of the Weser and Elbe. In his view, a serious accident is only a matter of time. We take a look at how the district is dealing with these giants and what politicians, BUND and shipowners have to say...

0

Video Palm Beach Pilots Handle Rough Seas in 4K

published on 26 February 2022

Unless you were paying attention on your last cruise, you might have missed the pilot boat bringing the pilot out to your cruise ship. Here's the story in 4K. Hey, be sure to subscribe too! Copyright © 2022 Richard L. Sites. All rights reserved. Any unauthorized reuse, copying, duplication, reproduction, or redistribution in part or in whole without written permission is strictly prohibited. To use this video for broadcast or in a commercial player contact me directly. Find me on:...

1

Video (4K) Sea Bear Pilot Boat 14 April 2020

published on 17 April 2020

The "Sea Bear", (ex "Narrows") was built in 1959 in Massachusetts for use as a pilot boat in New York. Ed Montgomery, at Sea Service, LLC, bought her and brought her to the Twin Ports in September, 2002.

0