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 Presentation of manned ship models at Port Revel Shiphandling Training Centre

published on 24 October 2019

Port Revel is used for shiphandling training of maritime pilots, masters and officers on a 5 ha lake with 11 manned model ships representing 20 vessels, and 4 tugs at scale 1:25 and DGPS tracking system. Instructors are former maritime pilots.
Training on the scale models provides experience that could never be gained on real ships for the simple reason that neither ship-owners nor local authorities would allow such risks to be taken. Scale models allow the shiphandler to make mistakes....

0

Video SAMMON Demo Planning FtLauderdale Arrival with comments

published on 20 January 2021

This updated video shows how easy it is to develop an arrival plan with the SAMMON Planning Tool. As a sample the arrival from appraoch until the berth to Ft. Lauderdale is used under strong current of 2kn. At the simulator training courses where we used this tool for preparation of a manoeuvring plan during the briefing sessions all nautical officers involved stated afterwards: "Why don't we have this tool on our ships?"

0

Article What is a pilot boat?

published on 9 January 2023

A pilot boat is a specialized vessel that is used to transport pilots to and from ships that are entering or leaving port. Pilot boats are typically small, fast vessels that are designed to operate in a variety of weather conditions and sea states.

0

Article Man Overboard Training - Loodswezen Amsterdam-Ijmond

published on 20 May 2021

The man-overboard manoeuvre includes all measures to rescue a person who has fallen overboard from a watercraft.

0

Video Know your Pilot Ladder in less than eight minutes

published on 13 November 2020

As part of Maritime Skill Enhancer Platform created by Navguide solutions, we give you a comprehensive inspection of your Pilot ladder, keeping you compliant, safe and ready for any inspection.
All this - in less than eight minutes!
Maritime Skill Enhancer is going to be the most practical platform to learn your day to day Maritime Skills, in matter of minutes. We are coming soon.
Subscribe to this channel and stay updated.

1

Article Pilot Boat 12m for sale in Denmark, Pro:Zero 12m DC - Light Pilot

by Marketplace by Marine-Pilots.com - published on 13 March 2020

Build year: 2015, Lenght overall: 12.0m, Beam overall: 3.0m, Draft (full load): 0.95, Engine: 1 Volvo Penta D6 330hk

0

Video Ship piloting in pandemic times in Santa Marta, Colombia

published on 5 April 2020

It has been 1 month since the 1st case of coronavirus in the country. All airports were shut down, and mandatory confinement was issued 10 days ago. Nevertheless, Maritime shipping must continue (except for tourist related). The means that us pilots must continue with our duties despite the risks involved with all the ships' crews arriving from different countries. So we need to take all safety measures possible.
This particular maneuver was unberthing a chemical tanker, in loaded...

0