He won bronze in the 1934 European Championships, competed in the 1936 Summer Olympics and at one point ranked second on the all-time world list.

[5] At the 1933 International University Games in Turin he won the silver medal, losing to Hungary's József Várszegi but defeating Germany's Gottfried Weimann, who had placed fourth at the Olympics.

[1] Sule failed to regain that shape for the next two years, only ranking sixteenth on the world list in 1935 and eleventh in 1936,[9] although he still won a bronze medal at the 1935 International University Games.

[2] In 1937 he again broke the Estonian record twice, throwing 72.72 in August and 73.31 in October,[3] and ranked fourth on that year's world list.

[5] Between 1928 and 1940, Sule was Estonian champion nine times in the javelin and once in the high jump, and won minor medals in the pole vault, shot put, hammer throw and decathlon.