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

Article Study: Correlation Evaluation of Pilots’ Situation Awareness in Bridge Simulations via Eye-Tracking Technology

published on 21 January 2022

Improvements to pilots’ situation awareness (SA) in maritime navigation are critical to reducing human errors, which have caused 75% to 96% of marine accidents over the last few years.

0

Article Report: Securing of pilot ladders at intermediate lengths – testing

by nc2 Engineering Consultancy - University of Southhampton - published on 28 July 2023

Report by nC2 Engineering Consultancy at the University of Southampton on behalf of the International Maritime Pilots' Association (IMPA) to investigate the effectiveness and impact of different methods of securing pilot ladders in medium lengths in a laboratory-based project.

0

Video How not to climb down a Pilot Ladder

published on 1 July 2020

The video was found on some social media channels in June 2020. When so many elementary mistakes are made and so many risks are taken, this is exactly what can happen! It's a demonstrative example of an unprofessional action: 1) Where is the life jacket? 2) No backpack on the shoulders. Use a rope to have the backpack lifted by the deck crew. 3) Where is the rest of the crew (on vessel / on the small boat) for safe assistance? What other mistakes have you discovered? We do not put videos...

0

Video IMPA Seminar on Maritime Pilots and Pilotage

published on 10 November 2022

The Seminar aims to inform Member States, intergovernmental organizations and non-governmental organizations in consultative status with IMO about the societal value of maritime pilots and pilotage as a public service. The IMO Secretary-General has recognised maritime pilots as having always been vital to ensuring the safety of navigation in key ports and shipping lanes globally and playing a crucial role in sustaining the global supply chain using specialized knowledge and expertise....

1

Article Update: Guidance to ships for safe Rigging of Pilot Ladders (1st May)

by AIMPA - All India Marine Pilots' Association - published on 1 May 2021

Version from 1st May 2021: Ships that require the services of a pilot need to ensure that the Pilot Transfer Arrangements (PTA) they provide are in compliance with the requirements prescribed under SOLAS V/23 and IMO Resolution A.1045(27) [as amended by IMO Resolution A.1108(29)].

0

Video IRAGO 7 Pilot Boat from Japan

published on 25 July 2022

IMO: - Name: IRAGO 7 PILOT BOAT Vessel Type - Generic: Pilot Vessel Vessel Type - Detailed: Pilot Vessel Status: Active MMSI: 431005936 Call Sign: - Flag: Japan [JP] Gross Tonnage: - Summer DWT: - Length Overall x Breadth Extreme: 20 x 4 m Year Built: - Home Port: - https://www.marinetraffic.com/en/ais/details/ships/shipid:1246908/mmsi:431005936/imo:0/vessel:IRAGO_7_PILOT_BOAT

0

Video Japanese pilot loses his life

published on 5 May 2023

長崎県に入港するクルーズ船「ダイヤモンド・プリンセス」を誘導していた水先人の男性が海に転落し、男性はその後、死亡が確認された。 死亡したのは、水先人の大須賀祥浩さん(69)。 長崎海上保安部によると、5日午前5時半ごろ、パイロットボートから無線で「客船に移乗させる際にパイロットが海中に転落した」と通報があった。 大須賀さんは長崎港の入り口付近で海に転落し、クルーズ船の救命艇に救助されたが、およそ2時間後に死亡が確認された。 男性は5日に長崎に入港したクルーズ船「ダイヤモンド・プリンセス」を誘導する業務にあたっていた。

0