Details are given of an electric bicycle, developed at the Pa Technology and Scientific Centre, at Royston, Hertfordshire, which runs for nearly 50 km at up to 30 km/h on two penny worth of electricity. The only controls on the Pa bicycle (in addition to the standard bicycle's brakes) are an on-off switch and a handlebar twist grip, which gives acceleration with a backwards rotation and a braking effect, together with regeneration, when twisted forwards. The main feature of the Pa bike is a new type of 24 volt permanent-magnet, brushless DC motor which, together with its plastic gears, comprises a "pancake" unit used as the front-wheel hub. The integrated unit is only 22 cm in diameter and 8.5 cm in width and fits without modification into the front forks of a standard pushbike. Rechargeable batteries are mounted on either side of the rear wheel. On the prototype, the electronic controls are mounted above the carrier. In production, however, the electronics could be reduced in size to a box measuring only 15 cm by 10 cm by 7.5 cm. /TRRL/

  • Corporate Authors:

    Associated Iliffe Press Limited

    Dorest House, Stamford Street
    London SE1,   England 
  • Publication Date: 1976-4-29

Media Info

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Filing Info

  • Accession Number: 00138955
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Nov 17 1976 12:00AM