In 1922 Rieseler obtained certification of the R III/22 (the III denoted the third vehicle, the 22 denoted the year) by the DVL (German Aeronautical Testing Establishment) in Adlershof at Johannisthal. The R III, now equipped with a more powerful Haacke HFM 2a two-cylinder boxer engine with 25 kW (34 HP), became the first German sports aircraft manufactured in noteworthy numbers. This airplane also had foldable wings and thus was transportable by a car or even a motorcycle, The Anzani six-cylinder engine that replaced the HFM 2a with Werner Rieseler in front of the aircraft. Several variants were built, denoted by characters, such as R III a, b, c
Description of the aircraft, emphasizing the high flight performance with a climb rate of 1,000 m/min (3,280 ft/min), flight speed of 125 km/h (78 mph), landing speed of 40 km/h (25 mph) and a distance from touchdown to full stop of only 10 m . Production rate  was one aircraft a week with the goal of one per day, thus significantly reducing production cost through mass production. The pilot’s outside view and the instrument arrangement were rated firstclass and the ability of carrying it on land just by a motorcycle was highlighted.
Reference 28 also gave a technical description as follows. The engine was a motor providing 22 kW (30 HP) at 1,300 RPM with horizontal cylinders, providing a good view for the pilot. The rest of the engine was under a fairing that could easily be removed for service access, also reducing the drag of the vehicle. The engine could be removed within 15 minutes. The fuselage consisted of a welded steel tube frame kept in shape by steel wires, and the fuselage was covered by cloth. The landing gear support was also a steel tube frame with elliptical cross-section for drag reduction and had a rubber band spring support to give some flexibility for shock absorption. Both elevator and rudder had a steel tube frame as well and were covered by cloth.
The article continues by describing the wing and the fuselage designs . The wing consisted of two pieces that facilitated an extraordinarily fast disassembly. They were connected to the wing support structure by bolts and diagonal steel tube struts attached to the bottom of the fuselage. The wings were of wooden construction with an airfoil chosen for a large range of speeds between forward flight and minimum flight speed, and to avoid aircraft spin. The removal of just six bolts changed the wing span of 7.2 m (24 ft) in flight to a width of just 1.4 m  for road transport, which could be completed in just 10 minutes. The wing area is 11 m² , aircraft length 5 m (16 ft), and empty weight just 160 kg. Adding 20 kg  for fuel, 70 kg  for the pilot (in 1923 pilots were quite slim!) and 50 kg  of payload, resulted in a maximum gross weight of 300 kg . The aircraft’s service ceiling is given as 3,500 m  and its range as 350 km .
To demonstrate the aircraft’s performance and to promote the sales of their aircraft, Walter visited foreign countries such as Sweden at the Gothenburg International Aero Exposition 1923  where he demonstrated his single-seater sports aircraft. The same issue of Aviation reported about the motor installed in the R III as a “21 kW (28 HP) 2-cylinder horizontal opposed air-cooled engine manufactured by the Haacke company, which is chiefly used on small sport planes, such as the Rieseler R III … now experimenting with a 3-cylinder air-cooled engine of 29 kW (40 HP)”.
An arguably spectacular but contrived event served to promote the R III in Germany was a landing “due to engine problems” by pilot Antonius Raab on the main boulevard “Unter den Linden” in the middle of Berlin on 8th July 1923, making the headlines of all newspapers, 
Quite “accidentally,” a number of press photographers and a movie team were at the scene to document the event, as well as several friends who helped to carry the aircraft after its landing  In 1925 an R III aircraft was used by pilot Hans Schulz during the “Deutschlandflug BZ Preis der Lüfte” [German Cross-Country Race BZ (Berliner Zeitung) Prize of Aviation] competition, and some prizes were obtained with the Rieseler R III variant configured with a 29 kW (40 HP) Anzani engine for flying  1,600 km
  winning the 4th place in Group A (machines under 40 HP) which was worth RM 6,000. On 19th July 1925 Rieseler lost his younger brother Werner during an aerobatic flight event in Prenzlau north of Berlin, when the crashed aircraft caught fire and burnt completely
. Aerobatic performances drew the attention of the public and were very popular, but they also had a high risk of damage, injury, and even death in these early years of aeronautics

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