Kroken achieved his first major success when he won the Norwegian Championship in Narvik in 1951 , where he set a new hill record on Fagerlibakken with 78.5 m. When jumping on the Skuibakken in Bærum in the same year he won with 83.5 meters. Two years later he was part of the Norwegian team for the first Four Hills Tournament in 1953 . He was able to win the second competition on January 4th, 1954 in Oberstdorf , after he had already reached 8th place in Partenkirchen on January 1st . In the third competition in Bischofshofen he came in 9th place. In the overall ranking he came in 11th place. In the Nordic World Ski Championships 1954 in Sweden's Falun he was at the end of seventh.
literature
Jens Jahn, Egon Theiner: Encyclopedia of Ski Jumping . AGON Sportverlag, Kassel 2004. ISBN 3-89784-099-5