van Hemmen, Rik

Rik van Hemmen is the President of Martin & Ottaway, a marine consulting firm that specializes in the resolution of technical, operational and financial issues in maritime. By training he is an Aerospace and Ocean engineer and has spent the majority of his career in engineering design and forensic engineering.

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Eye on Design: Flipping Small High-Speed Powerboats

Naval Architects can predict many things with great certainty. But the sea is an unpredictable task master and there are still a number of areas where it is difficult to get a technical handle on the problem.High speed planing boat stability is one of those areas.Planing hull design is incredibly complicated and dynamic behavior is actually more difficult to predict than the dynamic behavior of airplanes.
AIS Provide Skidmarks on the Ocean

Many years ago, I received a call from an attorney who wanted me to get on the plane to Houston right away to take a look at damage on two ships that had collided in the approaches to Houston.He told me that both vessels had become confused, had started to turn and managed to occupy the same bit of ocean at the same time. His preliminary analysis indicated that, if he could prove the other vessel turned first…