 After the war, Van Praag participated in one more speedway championship, but retired in 1950 to concentrate on his career as a pilot.Van Praag also appeared in the 1933 British film "Money for Speed" which starred John Loder, Ida Lupino, Cyril McLaglen and Moore Marriott.Ginger Lees, Frank Varey and speedway promoter Johnnie Hoskins also featured.