Hermann Noordung (the pseudonym for Captain Potocnik of the Austrian Imperial Army) published Das Problem der Befahrung des Weltraums (The Problem of Space Flight), which included one of the first serious attempts to put on paper the design of a manned space station. Noordung's proposed design consisted of a doughnut-shaped structure for living quarters, a power generating station attached to one end of the central hub, and an astronomical observation station. He was among the first to suggest a wheel-shaped design for a space station to produce artificial gravity, and also argued the scientific value of such a station in a synchronous orbit above the Earth.

Writing in the monthly journal Die Rakete, Baron Guido von Pirquet presented broad arguments in favor of the scientific possibility of manned space travel and the velocities required for orbital and interplanetary flight, of which orbital speed was by far the more difficult to attain. Von Pirquet suggested several different space stations for diverse functions: one in a near-Earth orbit as primarily an observation site and another station in a much higher orbit that would be more suitable as an orbital refueling station for escape vehicles.

Further improvements to the Valier-Oberth gun were suggested by Willy Ley and Baron Guido von Pirquet of Vienna. To achieve the necessary muzzle velocity, it would be necessary to construct the gun with angled lateral chambers. These design concepts would be put to military use in the V-3 Hochdruckpumpe cannon of World War II.

Robert Esnault-Peltrie and banker Andre Hirsch establish an International Astronautics Prize of 5000 Francs to be awarded annually for the best scientific, theoretical or experimental work in rocketry and space travel. The prize is discontinued after its value is wiped out in the financial crisis of the early 1930's.

Max Valier campaigned to get automobile magnate Fritz von Opel interested in rocket-powered automobiles. Valier proposed to use different combinations of compressed black powder rockets manufactured by Friedrich Wilhelm Sander of Wesermuende. Sander's rockets were 80 cm long, 12.5 cm in diameter, and could came in two versions. The centre-bore rockets provided 180 kgf for 3 seconds, while the end-burners provided 20 kgf for 30 seconds. Valier proposed to use combinations of these motors to first boost an automobile to high speed with the high-thrust rockets, then use low-thrust units to maintain velocity. This had no practical application but would demonstrate the potential of rockets to the German public, at the same time giving Opel publicity. The first secret test, at Ruesselsheim, used a one high thrust and one low thrust motor in a small stock Opel. The results were unimpressive - the vehicle went only 140 m in 35 seconds.

After two tests the day before, which showed that a good fraction of Brander's rockets would either fail to ignite or explode, Valier made the first official rocket car run for the press. Of 12 rockets attached to the 'Rak' vehicle (a motor car stripped of engine and brakes), five failed to function, but the vehicle reached 110 kph and the press was mightily impressed. Opel received an unexpected amount of free publicity and funded Valier in further rocket car development.

Fritz von Opel personally drives rocket-car Opel Rak II, equipped with 24 Brander powder rockets, to 200 kph at Berlin. The same day Oberth is debating the German scientific establishment, trying to overturn their belief that space flight using liquid rockets is theoretically impossible. The VfR regard Valier's experiments with Opel as publicity stunts, threatening the credibility of their society.

A rocket-boosted glider is flown by Friedrich Stamer from the Rhoen Mountains in Western Germany. The development was funded by Opel, the canard-layout glider designed by Hans Lippisch, and the powder rockets developed by Sander. As in the Opel ground vehicles, a boost rocket (360 kgf for 3 seconds) was to accelerate the glider down the launch ramp. A sustainer rocket (20 kgf for 30 seconds) would keep the aircraft in flight. It was hoped to develop a method of launching gliders that would allow the pilot to get airborne without assistance - that did not require a tow aircraft or the eight-man crew needed to pull back the rubber band on existing rail launchers. Tests with smaller motors in models showed the high-thrust motors were too powerful, so the full-scale tests used a standard rubber-band rail launcher with only the low thrust motors installed. After two attempted flights, Stamer finally made a successful flight, firing two 20 kgf motors one after the other. The glider flew about 1.5 km in 70 seconds. On the second flight the first motor exploded, setting the aircraft on fire. Stamer landed successfully but further attempts were abandoned.

Rose out of tower rapidly and tipped, passing over observation shelter; distance 204.5 ft; speed about 60 mph. This flight was followed by a series of static tests, to develop liquid 'curtain cooling' for inside of combustion-chamber wall, a regenerative system, and better stability in flight.