Start of official rocket-mail service between two Austrian towns by Friedrich Schmiedl; test flights began in February 1931, while rocket-mail service continued until March 16, 1933. References: 17 .

Flight of Goddard liquid fuel rocket with jacket, streamline casing, remote control. Length, 9 ft 11 in.; diameter 12 in.; weight empty 37 lb; weight loaded 87.2 lb; in air 9.6 sec; height 180 ft; trajectory 'like a fish swimming upward.' References: 482 .