The Pionier 9 was designed in 1957-58.
He first build a wooden "plug" that he sailed himself, before starting to build the first polyester Pioneers. The first Polyester Pioneer was finished in the summer of 1959, just in time to participate in the Flevo Race of that year. Van de Stadt sailed the race himself and won in his class.
Loa = 9.10 m.
Lwl = 7.32 m.
Beam = 2.40 m.
Draft 1.40 m.
displacement 3.30 m3 = 3.30 tons
"E.G. van de Stadt, Pionier in jachtontwerpen" Authors: Willem Akkerman, Theo van Harpen en Jan Briek. Publisher: Van Wijnen, Franeker, Netherlands. ISBN 9789051942187
The book comes with a CD ROM containing all(?) his plans and designs.
E.G. van de Stadt (1910-1999) designed +/- 650 boats.
Herman Jansen, sailed around the globe in his Sounion, a Pioneer (Pionier in Dutch) and wrote a book about his journey "De horizon zeilde mee, dag na dag...". The book was also published, at the time, in the "Waterkampioen" a Dutch boating magazine. Herman Jansen set sail in July 1972 and became the first Dutch solosailer, to sail around the world.
p.s. Found some pictures here:http://www.boatsandoutboards.co.uk/view/YSP060