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navyspecial 


Free Running Model tests have always been in common use at MARIN, given that they offer the most accurate picture of a ship’s behaviour. However, this technique is also important for submarines. But until now, little has been reported on the usually hidden activities of submarines. Report takes this opportunity to reveal some of the latest developments in this underwater world.


 


F  


or submarine model testing, particular- ly when it concerns manoeuvring and seakeeping, two techniques are in


principle possible: captive tests and Free Running tests. Captive tests consist of a range of activities, including model design, a matrix of test conditions, an analysis of test results, fitting of derivatives and performing simulations. Free Running tests require fewer


stages and therefore, the results are much more quickly available. In addition to that, the results give the most complete picture of the behaviour of the boat but without the schematisations of a mathematical model.


New approach The first Free Running model of a subma- rine actually sailed at MARIN back in the


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