Norbert Riedel (* 1 April 1912 inJägerndorf,Sudetenland, thenAustria-Hungary; † 24 February 1963 inZürs am Arlberg,Austria) was an engineer and entrepreneur.
Riedel studied mechanical engineering and worked in the 1930s, first withArdie and then atVictoria. During theSecond World War, he developed a starter engine ("Riedel starter") for the first Germanjet engine-powered combat aircraft's powerplants. The starter system, which consisted of a Riedel 10 hp (7.5 kW)two-strokeflat engine hidden in the intake, essentially functioned as a pioneering example of anauxiliary power unit (APU) for starting a jet engine. A hole in the extreme nose of the centrebody contained a manual pull-handle (except for the BMW 003 engine)[1] which started the piston engine, which in turn rotated the compressor. Two small petrol tanks were fitted in the annular intake.[2] The engine was considered an extreme short stroke (bore / stroke: 70 mm / 35 mm = 2:1) design so it could fit in the hub of the turbine compressor. For reduction it had an integratedplanetary gear. It was produced in Victoria inNuremberg and served as a starter for the operational GermanJunkers Jumo 004 andBMW 003 jet engines, placed on the centreline of each of these, and was also meant for use on theHeinkel HeS 011 experimental jet engine, but relocated above the intake passage within a Heinkel-designed prefabricated sheet metal component instead.
In 1947, he founded theRiedel Motoren AG inImmenstadt, where he designed the light motorcycleImme R100 which was manufactured in series. By the end of 1951 12,000 units were built. In December 1949, Riedel began design work for the scooterTill Riedel, however due to the insolvency of Riedel Motoren AG did not go into production in October 1951. In development was also an Imme with a two-cylinder engine.
After the bankruptcy of Riedel Motoren AG he went back to Victoria, where he developed the modelsVictoria Swing and the 200 cc two-stroke scooterVictoria Peggy. The "Peggy" was provided with a novel electromagnetic pushbutton circuit, electric starter, fan cooling and a propulsion unit swingarm. Also, the swing was equipped with the pushbutton circuit.
Norbert Riedel died in 1963 in an avalanche.
Starting procedure is as follows: Starting engine is primed by closing electric primer switch, then ignition of turbojet and ignition and electric starting motor of (the) Riedel engine are turned on (this engine can also be started manually by pulling a cable). After the Riedel unit has reached a speed of about 300 rpm, it automatically engages the compressor shaft of the turbojet. At about 800 rpm of the starting engine, starting fuel pump is turned on, and at 1,200 rpm the main (J-2) fuel is turned on. The starter engine is kept engaged until the turbojet attains 2,000 rpm, at which the starter engine and starting fuel are turned off, the turbojet rapidly accelerating to rated speed of 9,500 rpm on the J-2 fuel
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