Showing posts with label model. Show all posts
Showing posts with label model. Show all posts

Friday, August 23, 2013

Weighty Matters

During the past 40 years, the Department for Transport (DfT) has gained a wealth of experience in the art of data manipulation and disinformation when conducting official investigations into fishing vessel casualties, especially those in which dubious stability was thought to be a factor in their loss. This expertise is currently being used quite blatantly by the DfT (via MAIB) to both cover their own backs and safeguard the interests of their many business ‘clients’.

Generally, the DfT only feels threatened when it has made a mistake - when there is something it did not do, that it should have done or it did something that it should not have done - and lives were subsequently lost at sea.

In the case of the FV Gaul, the DfT approved her stability (see copy of the stability certificate below), for unlimited operation at sea, just 14 month’s before the trawler capsized and sank (in February 1974), with the loss of 36 lives.


Following the loss of the Gaul, the official investigation, led by the DfT, was quick to put on record that the Gaul had met the IMCO minimum stability standards for deep-sea trawlers “with a substantial margin”. 

In our posts of 1 January 2010 [LINK] and 8 February 2010 [LINK] we were able to point out that this official statement was, in fact, incorrect and we gave details of the Gaul’s ‘arrival in Port’ and preceding sailing conditions where the IMCO minimum stability standards were not and could not be met. 

Trident 
 
In our post of 4 August 2010 [LINK] we also described how the stability records for the calculated lightship and sailing conditions of the Trident, which capsized and sank in 1974, with the loss of 7 lives, were callously modified by the Trident RFI experts (hired and paid for by the DfT) to give credence to the “official” view that, at the time of her loss, the Trident substantially met the IMCO stability standards of the day – an official requirement for grant-aided fishing vessel purchases in the early 1970s. 

We also noted in our posts of 28th February [LINK] and 27th April 2011 [LINK] that considerable sums of money had been squandered on worthless model tests, which were deliberately fed with doctored data, to give the results that our officials desired [1]

This blatant deception was only attempted because, contrary to official policies, the Trident’s lightship particulars (and stability reserves) had not been accurately established and verified [2] at the time that she was built. 

Gaul 

The Gaul’s lightship particulars (and stability reserves) were also left unverified when she was built [3], the data used being merely a copy of those derived from the inclining experiment, held in February 1972, on the Ranger Calliope (subsequently re-named Arab).

Testimony by Mr M. Scott (DfT surveyor) - 1974 Formal investigation into the loss of the Gaul - Day 12 page 27 : 


Surprisingly, if you check out the lightweight figures in the footnote below [4] you can see that an additional 11 tons of solid ballast has somehow managed to make its way into the calculations of the DfT, the shipyard and the Owner’s Consultants. When their investigations into Gaul’s stability were put in hand for the 1974 inquiry, it became an integral, unspecified part of the Gaul’s lightship weight. 

This 11 tons of notional ballast was useful in subsequent calculations in that it lowered the Gaul’s vertical centre of gravity (by 180 mm) - and would therefore be readily adopted by those who did not wish the tag of ‘deficient stability’ to be linked to the Gaul’s loss. Nonetheless, at the original FI hearings, the Builders, Brooke Marine, the Owner’s consultants, Y-ard and the DfT all managed to imply that solid ballast was not necessary on the Gaul to meet the IMCO minimum stability requirements (see below):

Mr M. Scott (DfT) - transcripts day 12 page 45 

Mr G. Donaldson (Brooke Marine) transcripts day 9 page 67
 
Mr A. Gilfillan (Y-ard) transcripts day 11 page 43 – in proposing improvements for Gaul’s 3 remaining sister vessels: 


This notional ballast was also an integral but invisible part of the Gaul’s lightship weight during the subsequent lengthy and expensive testing carried out by Morral in the late 1970s at the National Maritime Institute. This was another instance in which taxpayer’s money was spent on extensive model testing, but in which the basic data was skewed, to give the results that our officials desired. 

If we exclude this 11 tons of phantom ballast (it was not present on the Gaul) from the Gaul’s lightship and then check out her reserves of stability, we can see that this was degraded to the point where she did not meet the IMCO minimum stability criteria on arrival at distant fishing grounds. Furthermore, if she then did not proceed to promptly fill her fish hold with a significant catch of fish, she would be unable to meet the IMCO minimum stability standard throughout the rest of her voyage!

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[1] In 2005 the DfT also deliberately destroyed a number of folders of evidence and video that was unfavourable to their desired outcome.

[2] Neither an inclining experiment nor lightship check was carried out on the Trident. 

[3] The Gaul’s lightship data (displacement & vertical and longitudinal centres of gravity) were not obtained from a unique inclining experiment; they were copied instead from an inclining experiment held on the Ranger Calliope (a sister to the Gaul) on 1 February 1972; however, a simple lightweight check, to verify the integrity of the copied data, was not carried out on the Gaul. 

[4] Lightship data obtained from the inclining test on the Ranger Calliope
Displacement = 1099.63 tons, 
Vertical centre of gravity = 20.2 ft above base 
Longitudinal centre of gravity = 9.46 ft aft Midships 
Gaul Lightship data - used for all official stability investigations: 
Displacement = 1110.6 tons, 
Vertical centre of gravity = 20.02 ft above base 
Longitudinal centre of gravity = 9.99 ft aft Midships

Monday, August 01, 2011

Confirmation bias

In 1975 in the aftermath of the Gaul and Trident disasters the Department of Trade decided to sponsor a program of research at the National Physical Laboratory (NPL), to try and discover why two well found fishing vessels had suddenly capsized and sank with significant loss of life. This research would focus on stability issues and would be carried out by the ship division of the NPL (subsequently renamed the National Maritime Institute, NMI), one of the world’s leading maritime test establishments at that time.


Scale models of the Gaul and the Trident hulls were then built and subjected to a program of sea keeping tests in waves of varying magnitude; their behaviour in different conditions was filmed, documented and analysed. Unfortunately, the outcome from this research was initially kept under wraps by the DOT, until, in 1979-80, Dr Tony Morrall (NMI) was allowed to publish two brief technical papers, through the Royal Institution of Naval Architects. The two papers gave an edited overview of the NMI’s research/conclusions for the two vessels and video footage from the NMI tests was shown, although the identity of the Trident was concealed:
  1. ‘Capsizing of small trawlers’ published at a RINA meeting in Glasgow on February 20 1979 (N.B. The Trident was not identified within this report; it was merely referred to as ‘trawler A’)
  1. ‘The Gaul disaster: an investigation into the loss of a Large Stern Trawler’ -  published at a RINA meeting in London on April 15 1980
In brief, the conclusion from the NMI research about the loss of the Trident was that she had capsized in moderate sea conditions because she had insufficient stability, while the conclusion about the loss of the Gaul was that she had capsized because of severe weather conditions in conjunction with some unknown circumstance such as internal flooding, which had degraded her inherent stability reserves. [1]

Following the discovery of both wrecks and the decision to re-open both formal investigations (RFI), the DfT’s experts dusted down and sifted through the NMI’s research folders and decided that:
  • The NMI research data on the loss of the Gaul, had yielded the ‘right’ answers, as far as the DfT was concerned, and therefore could be utilised as evidence during the Gaul RFI. In fact in their marine accident report no. 4/99, the MAIB went as far as praising the NMI’s research as being “a comprehensive and ambitious project lasting two and a half years”. Video footage of the NMI tests together with the Morrall research paper were considered to be new and important evidence for the purposes of the Gaul RFI hearings in 2004
  •  Unfortunately, the NMI research data on the loss of the Trident (which had an identical pedigree to that of the Gaul) had yielded the ‘wrong’ answers, as far as the DfT was concerned, and was therefore deemed to be unsuitable for a public airing or disclosure during the Trident RFI.
Thereafter, in 2005 the DfT allegedly shredded the Trident research folders and in the RFI hearings of 2010, the Advocate General and her experts together with the Aberdeen Sheriff summarily dismissed the NMI research data (see below):

Pages 188-90 Trident RFI - transcripts of evidence 12/7/2010:

The above exchanges between Mr Thomson, the counsel for the Trident families, and Sheriff Young, where rational argument is being summarily dismissed by ridicule, do not cast the Sheriff in a favourable light.

While the DfT and its associates have been keen to disregard and discard the Trident’s NMI research data with its inconvenient conclusion regarding stability, the Trident families have not, as yet, been convinced [LINK] by this official obfuscation.

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[1] In our posts of 1 January 2010 and 8 February 2010 we revealed that the DOT/Owners had estimated the Gaul’s stability reserves for her last voyage to be greater than was reasonably justifiable. This ‘enhanced’ level of stability was also specified by the DOT for the model used in the Gaul NMI tests, the test results would undoubtedly have been influenced by this factor.

Thursday, May 13, 2010

FV Trident Stability - model testing

In a few days time  - more precisely on the 24th of May 2010 - the re-opened formal investigation into the sinking of FV Trident is due to reconvene.
In anticipation of that day we have read through the transcripts of evidence available so far.
In 2002 when the then Secretary of State for Transport, Mr Stephen Byers, ordered the re-opening of the Trident inquiry, we were advised that new and important evidence had been discovered that justified a new investigation into the vessel's loss.

However, after ploughing through more than 7000 pages of recorded oral evidence (from the 40 days of hearings in the Aberdeen Court), we have not been able to locate any new and important evidence!
We were also surprised to learn that, despite the technical expertise that is available to the court, the Advocate General found it necessary to seek external advice on one of the simplest concepts in Naval Architecture concerning ship stability.

AG - "It is true that raising KG is generally detrimental and lowering KG favourable and this applies to all vessels" - Do you agree with this statement Dr Schmitter? [...]
Dr S - Yes in general terms this statement is correct
AG - Right.
(Transcript of evidence of 12 November 2009)

For the benefit of those with an interest in trawler stability, we have prepared a short video clip (see below, split in two parts), which explains the significance of KG (VCG) to transverse stability. [1] [2]






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[1] KG is the height of the vertical center of gravity above the keel (also known as VCG)

[2] Unfortunately, on the Trident the VCG position was not accurately known because an inclining experiment had not been carried out.

Wednesday, July 29, 2009

The culture of callousness

It is common knowledge that the measure of a civilised society is given by the way in which it cares for its weakest members. Judged by that measure, I’m afraid, today’s Britain would not score very high - the sympathetic activities of our so-called social-democratic regime being more declamatory than real.

A culture of callousness seems instead to have pervaded Britain, the latest and most shocking example of which being the disgraceful treatment of the soldiers wounded in combat in Iraq and Afghanistan.
As if possessed by some ungodly avarice, the government has adopted the moral philosophy of the money-changers, and has now the audacity to take those wounded in war to Court, for the purpose of minimising their injury compensations.
Taking from the most deserving and giving to the least - this is what the squandering of public money on frivolous schemes and dubious contracts, rather than paying for the state’s most basic obligations, equates to.
The whole charade of leaving the MOD to handle competing financial obligations on a fixed, limited, budget is just an unseemly subterfuge; the government could very well set up a separate, special, fund to settle the claims of the military and avoid this ugly and ungenerous quarrel.


Also nowadays there appears to be a stigma attached to any search for compensation – as if all those seeking to obtain financial redress for their losses were some kind of system spongers or benefit cheats.
The so-called ‘culture of compensation’ that many within the British Establishment often decry is, in fact, the normal application of the law; it is not charity.
The right to compensation represents one of the principal checks and balances that society has created so as to ensure that its weakest members have some protection against the might of the strong.
What is more, the prospect of litigation can make both governments and private employers much more careful when dealing with human lives.
Our government should be able to recognize these factors and strike a fair balance between ethics and their various financial priorities.

Thursday, June 12, 2008

Photographic evidence

In our posts of 27 April and 05 May we provided photgraphic evidence from the 2002 underwater survey of the wreck of the Gaul showing damage to the closing arragement of the vessel's offal chute's inner covers. This evidence clearly contradicts the final conclusions of the 2004 Gaul RFI.
As previously advised, we are now presenting a video clip which contains further details on this subject, including a model of the offal chute's inner covers and their probable behaviour when subjected to seawater pressure.



Gaul - offal chute inner covers
Video sent by gadflymotion531

Monday, May 21, 2007

Now and then

In 1976 the UK National Maritime Institute completed a model of the MFV Gaul. The subsequent model tests and associated research took more than two years. The model was operated in the towing tank at NMI Feltham and then tested in real sea conditions, in Christchurch Bay.
The NMI conclusions, set out in their report of 1978, confirmed that: in the intact condition the stability of the mv Gaul was adequate. The stability of the vessel would be reduced to a dangerous level only when the factory deck was in a partially flooded condition.
(Anybody interested in viewing the official records of this research, can view the original clip HERE)
Prior to the 2004 Re-opened Formal Investigation, the Marine Research Institute of Netherlands was contracted to build a new model of the Gaul and test its survivability under various parameters. This model was afterwards tested in a water tank that simulated the waves and winds on a proportional scale. MARIN also carried out a FREDYN time domain computer simulation of the vessel’s behaviour in various operational and environmental conditions.
PHOTO ALBUM (click NEXT on the right panel)
The results of the 2003 MARIN model tests confirmed that: rapid accumulation of water on the factory deck would sink the vessel.
(Anybody interested in viewing the official records of this research, can view one of the original clips HERE)