Paul Jaray

Paul Jaray ( born March 11, 1889 in Vienna, † September 22, 1974 in St. Gallen) was an Austrian engineer and aerodynamicist. He is beside Edmund Rumpler as the "father of the streamline form."

Life

Paul Jaray was the fifth child of the Jewish businessman Adolf Járay ( until 1869: Jeiteles ) born Therese Schoenberg in Vienna and Temesvár. He studied engineering in Vienna ( 1906 ) and Prague ( 1911 ) and came in 1912 to Friedrichshafen, where he worked as a chief engineer in the aircraft Friedrichshafen. 1912 married Paul Jaray Olga Jehle, with whom he had three children. From 1914 Jaray worked at the Zeppelin airship, where he was involved in the development of the 126 types LZ 38 to LZ. There Jaray out research in aerodynamics, an issue which is further employed him for decades. His findings influenced the aerospace, automotive and bicycle technology. Jaray converted to Catholicism in 1917. From 1923 lived Jaray in Switzerland. First, he pursued an engineering office in wells, from where he as an advisor to the British government on the subject of working airships. From 1925 he produced under license of the radio receiver Alaphon, from 1932 's radio in the radio service and Radiobau AG in Lucerne. In 1937 he left his wife and children. In 1941 Jaray was technical director at aircraft Farner AG in Grenchen, from 1944 he worked at G. Naef flight mechanics in fish valley. The marriage with Olga Jaray was divorced in 1945, the same year he married his second wife, Martha Steiner, divorced Bernays. 1950 Jaray lived in Kempten ( Switzerland ) where his second wife died in 1968. A little later, he married his third wife Marguerite Leuenberger. Paul Jaray died on September 22, 1974 in St. Gallen.

Aviation

Paul Jaray was interested in early for aviation. In 1912 he applied for a patent for an aircraft with cantilever wings - an invention that he did not pursue. With Zeppelin 1919 he built a wind tunnel and examined the flow characteristics of the air ships. The result of this research were the Zeppelins LZ 120 "Bodensee" and LZ 121 " North Star ". These two were the first fully streamlined built airships and based largely on the findings of Paul Jaray. These airships of the supporting body was teardrop shaped instead of previously designed cylindrical. Jaray developed the Spähkorb to Peilgondel.

J -Rad

1920 Jaray designed a Trethebelrad - J- Rad - in which he applied his aerodynamic advances to the bicycle industry. From the J -Rad were 1922/1923 built by the Hesperus plants in Stuttgart about 2000 pieces, which enjoyed great popularity especially in Holland. After fatal accidents due to defective materials production in 1923 has been set.

Automotive

Jaray said on September 8, 1921 at the Reich Patent Office in Berlin for a patent on a streamlined automobile body to. Because of patent disputes his application was granted only in 1926 as DRP 441 618:

The Jaraysche body already designed the basic shape of today's cars: the front is rounded and the tail tapering to a point, so that the side view resembles a falling drop. As the Rumpler Drop Car ( Cd value 0.28! ) Already was ahead Jarays aerodynamically optimized shape of their time. The public and the trade press, the vehicles were derided the extraordinary design. The bodies were then usual with their vertical coolers and the outer wheels with their huge wings as barn doors in the wind. Due to the rather low speeds played the aerodynamic design of the cars in the 1920s no major role.

In contrast to the eccentric Rumpler Jaray cars had the advantage that they could use the complete mechanics of commercial automobiles. The first vehicles by Jaray license were the ley T-6 (prototype), the Audi Type K and the Dixi G7. The Audi Type K had a 3560 cc and 50 hp large (37 kW ) four- cylinder engine and reached with standard body a speed of 95 km / h with Jaray body already 130 km / h When Dixi G7, which had a 1568 cc and 24 hp large (18 kW ) engine, the streamline shape increased the maximum speed of 80 km / h to 100 km / h

The Apollo works under the chief engineer Carl Slevogt delivered 1914-1925 type three Apollo Sport 4/20PS standard with a Jaray streamline body made ( constructed in 1923 on behalf of Apollo), the price in this version 8500 Mark.

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