Fatal stability loss of a small craft on a wave crest - based on real safety investigation

Risto Haimila, Tapani Salmenhaara, Jerzy Matusiak

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review


The capsizing of a pilot boat in average weather conditions has generated questions about sufficient stability regulations and uncertainty in pilot boat operations. Abnormal wave formation due to the interaction of a turning vessel and sea surface waves raised particular problems associated with the special operational conditions of the pilot boat. Investigation of the accident has shown that the V-bottom shaped boat may lose 70% of the righting arm maximum on a crest of a typical steep sea surface wave compared to the calm water line situation. This, combined with the external loads and other dynamic effects, caused capsizing of the pilot boat.
Original languageEnglish
Title of host publicationProceedings of the 17th International Ship Stability Workshop
EditorsRuponen Pekka
Place of PublicationHelsinki
PublisherAalto University School of Engineering
Number of pages6
ISBN (Electronic)978-952-60-3768-4
ISBN (Print)978-952-60-3767-7
Publication statusPublished - Jun 2019
MoE publication typeA4 Article in a conference publication
EventInternational Ship Stability Workshop - Helsinki, Finland
Duration: 10 Jun 201912 Jun 2019
Conference number: 17


WorkshopInternational Ship Stability Workshop
Abbreviated titleISSW
Internet address


  • pilot boat
  • V-shaped bottom
  • boat stability
  • stability on wave crest


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