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... States. 1931 January 1931 January Jan 1 1931 1 Jan 2 1931 2 Jan 3 1931 3 Jan 4 1931 4 Jan 5 1931 5 Jan 6 1931 6 Jan 7 1931 7 Jan 8 1931 8 Jan 9 1931 9 ... 23 1931 23 Aug 24 1931 24 Aug 25 1931 25 Aug 26 1931 26 Aug 27 1931 27 Aug 28 1931 28 Aug 29 1931 29 Aug 30 1931 30 Aug 31 1931 31 September 1931 September Sep 1 1931 ...

Media:US1838984A.pdf U.S. Patent 1.838,984 for Rocket Motor Aeroplane issued to Louis Berkowitz of New York on Dec 29 1931 December 29, 1931 . Filed Mar 20 1931

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

''The Death Cloud'' a science fiction story by American Interplanetary Society founder Nathaniel Schachner and Arthur Zagat appears in Astounding Science Fiction magazine. Science and Invention magazine features article on cometary impacts. Image:SI 1931-05.jpg 300px

Robert Esnault-Pelterie is scheduled to appear at the American Museum of Natural History at the invitation of the American Interplanetary Society but cancels at the last minute. G. Edward Pendray delivers a talk to a full house in his place. Image:AIS_Jan_27_1931_.jpg 200px

William G. Swan stayed aloft for 30 minutes over Atlantic City, N.J., in a glider powered with 10 small rockets.

Navy ordered its first rotary-wing aircraft, the XOP-1, from Pitcairn Aircraft.

More than $100 million was appropriated by Congress for military, naval, and commercial aviation for the coming year.

First liquid-fuel rocket successfully fired in Europe, a methane-liquid oxygen rocket constructed by Johannes Winkler and flown from Gross Kuehnau, Dessau. Germany. It reached an altitude of about 1000 feet. The rocket was two feet long and one foot in diameter.

First Navy aircraft with retractable landing gear, the XFF-1 two-seat fighter, ordered from Grumman Aircraft.

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