The 'Williwaw' was built in 1968-1970 on behalf of Willy de Roos (1923-2008) at the Michot yard in Thuin. The name 'Williwaw' comes from a type of fall wind that occurs in coastal areas bordered by snowy and icy mountains. Willy de Roos made 3 major world trips and wrote a book about his journey each time. He also gave lectures.
After the sea voyages, the yacht was purchased by the non-profit organisation Friends of the Maritime Museum to become part of the collection of the National Maritime Museum in Antwerp. The ship was donated back to the City of Antwerp in 1996. The city council decided on 18 August 1998 to put the 'Williwaw' at the disposal of the non-profit Sail Training Association Belgium (STAB). From 1998 to 2000, the 'Williwaw' was restored by professionals and restorers from the museum and the Antwerp Port Authority, many volunteers, members of STAB and AZCN (Antwerps Zeilcentrum Noordkasteel). In 2000, the sailing yacht was returned to service as an education and training vessel for young people. In that function, the 'Williwaw' is also a sailing ambassador, including as a participant in the Tall Ships Race and several nautical events.