Gustav Estlander (1876 - 1930) began his career as a boat designer in the years just prior to 1900. He didn't become professionally interested in racing yachts until about 1910 when he designed Aldebaran to the R rule. But it was first after 1915-16 when he turned to the 22 square meter that his true time of greatness was launched. His designs, Colibri and Colibri II did well on the racing circut and brought him well deserved attention as a designer. In the coming few years he was to become one of the forefront square meter designers, stretching boat lengths to extremes. He also was well known for his 6 meters. Together with Jac M. Iversen and B. Bothen he worked on designing a less expensive yacht based on the 30 square meter class. This eventually resulted in the Nordic 5.5 meter.
Estlander became a primere square meter designer in the years leading up to his death. His boats dominated the Swedish racing scene towards the end of the 1920's. Especially two of his boats will always be remembered as candidates to the square meter hall of fame... 30 sq.m. Bacchant and 150 sq.m. Singoalla. Bacchant for its racing record and Singoalla as one of most extreme boats ever designed. Read a Uffa Fox quote about his experience on Singoalla here...
All told, Gustav Estlander probably designed something in excess of 300 yachts.