At the 1936 Summer Olympics in Berlin he was part of the Belgian water polo team that won the bronze medal.

Taking part in two Winter Olympics, he earned his best finish of sixth in the two-man event at Oslo in 1952.

Castelyns died in Berchem on 17 June 1974, at the age of 57.

You can help Wikipedia by expanding it.This biographical article relating to bobsleigh in Belgium is a stub.

You can help Wikipedia by expanding it.This biographical article relating to a Belgian water polo figure is a stub.