Career
He is currently the manager of Dutch top amateur side IJsselmeervogels. Club career Adelaar played professional football for Football Club Utrecht and after that he played for the amateur clubs DOVO and HVV Hollandia. Managerial career After retiring as a player in 1993, Adelaar has managed GVVV, Football Club Utrecht, Akratitos, De Graafschap, ADO Den Haag and Football Club Volendam.
He was appointed by Sparta Rotterdam in May 2009 and dismissed in April 2010.
In March 2014 he was appointed manager of Dutch amateur side IJsselmeervogels until the end of the 2013/14 season.