From left to right: Do Ligtelijn, Ed van Daalen, Marinus Oosterveld and Jan Blok

Cooperative Research Ships celebrates 50th

As relevant today as it was in 1969

As Cooperative Research Ships (CRS) celebrates its 50th anniversary, we talk to some of MARIN’s key figures – both past and present - about this unique alliance, which has carried out more than 100 ground-breaking projects.


arinus Oosterveld, former President of MARIN, joined the research institute in 1961. In 1969

two of the ‘CRS founding fathers’ – Kockums shipyard of Malmö (Sweden) and Chantiers de l’Atlantique of St. Nazaire (France) – asked him to organise the first formal CRS event. Marinus became the first chairman of CRS until his retirement in 1996.

At that time there was simply no cooperation between the shipyards, ship owners or classification societies, he explains. “They never talked to each other. But then when

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they started to make contact through CRS and even with their competitors, they realised that they are all human beings!” he laughs.

Early days of CRS – increasing size of ships The real impetus in the early days of CRS was to get a group together so there could be ‘a meeting of minds’ about the ever-increasing size of ships. “Given the growing size of the ships, tankers in particular, it was getting difficult to solve problems. It was unknown territory for everyone.” The first working group addressed the powering performance and

motions in waves of full block ships with a low length-to-breadth ratio.

Jan Blok joined MARIN in 1974 and has been involved in numerous CRS working groups. In 2004 he was appointed Secretary of CRS. He worked within the organisation until his retirement from MARIN in 2009.

Jan comments: “Tankers had been roughly the same size until the 1950s, and then they were lengthened substantially in the sixties and we saw the super tankers arrive.


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