In the 1933 World Ice Hockey Championships he scored two goals in a round robin match against Poland in Group B of the European tournament draw.

[2] In the 1935 World Ice Hockey Championships in Davos, Switzerland he scored two goals against Poland in the ninth place game of the tournament.

His teammate Rudi Ball was half-Jewish, and thus was initially overlooked for selection in the German ice hockey team.

[7] Jaenecke played for Germany in the International Lawn Tennis Challenge ties against Italy (in the 1932 Europe Zone final), Japan and Egypt.

At the end of the war, he was forced to abandon his factory located in the east of the city, which fell under Soviet control.

It also managed the Redoute, a famous ballroom in Bad Godesberg, and Bonner Press Club, a group of journalists from Bonn.