Duplex steering

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Duplex steering

The duplex steering was a special type of front wheel guidance on motorcycles . The duplex steering with two steering heads was patented in 1927 by the Osborn Engineering Company (OEC) in Gosport and installed in their production motorcycles. The front wheel is connected to a double tube system that is supported by joints on the motorcycle frame; This means that the steering and suspension functions are separated from one another , similar to the Ackermann steering . The duplex steering, which allowed exceptional stability but only a small steering angle, was used on the OEC models until the late 1930s.

Joseph S. Wright set the absolute speed record for motorcycles of 150 mph on November 6th, 1930 in Cork (Ireland) . The JAP -OEC with duplex steering was presented as a record machine at the London Olympic Exhibition and entered in the record list. It later emerged that Wright had brought two motorcycles to Ireland for a record drive: an OEC and a Zenith , both with an identical 996 cc V-2 engine with a supercharger from JAP. However, the OEC (with duplex steering) remained on the track during the record attempt with engine failure after the first trip, so Wright drove the Zenith (with trapeze fork ) in both directions and set the record. There is speculation about whether the engine supplier JAP awarded the record to a manufacturer whose production was not stopped at the time.

Web links

Remarks

  1. ↑ There should have been only one press photographer. Cf. Tragatsch, p. 649.
    According to Setright, p. 184, the photographer hurried to his agency with the pictures from the first run, which he already had “in the can”, without waiting for the second run.
  2. ↑ In 1930 Zenith ran into financial difficulties and production came to a standstill. In 1931 Writers Ltd. See Collins, p. 137

Individual evidence

  1. ^ Paul Collins: British Motorcycle Brands. Motorbuch Verlag Stuttgart, 1st edition 2000, ISBN 3-613-02036-X , p. 91.
  2. ↑ S. Ewald: Encyclopedia of the motorcycle . Bechtermünz Verlag, Augsburg 1996, ISBN 3-86047-142-2 , p. 368.
  3. ^ Hugo Wilson: The Lexicon from the motorcycle. Motorbuch Verlag, Stuttgart 2001, ISBN 3-613-01719-9 , p. 152.
  4. ↑ Joseph Wright with the wrong record machine
  5. ^ LJK Setright: The Guinness Book of Motorcycling. Facts and Feats. 1982, ISBN 0-85112-255-8 , p. 238.
  6. ↑ Erwin Tragatsch : Famous Motorcycles. Motorbuch Verlag Stuttgart, 1st edition 2000, ISBN 3-613-02038-6 , pp. 648, 649
  7. ↑ thevintagent.blogspot.de THE WORLD'S FASTEST WHITE LIE (accessed October 24, 2014)