Harley-Davidson DAH
The Harley-Davidson DAH (1929 to 1933) was a racing motorcycle with a two-cylinder engine developed by Harley-Davidson for hill climbing . Around 25 copies are said to have been produced and delivered to selected factory drivers.
Development and technology
The Flathead D series model presented in 1929 and its 742 cm³ displacement (45.3 ci) V2 engine (bore / stroke 70 × 97 mm) served as the basis for the development of a factory racer with OHV valve control . The engine got four short exhaust stubs and a revised magneto. In the gearbox, the gear ratio was applied for only one gear; The sprocket and chainring could be changed on different routes. In the event of a fall, a kill switch - a leather strap that was attached to the ignition magnet on the driver's wrist - switched off the engine. On the chassis with a single-loop pipe frame and spring fork , the tank was mounted close to the steering head in order to shift weight. A snow chain from Weed on the rear wheel provided grip on the mountain. Joe Petrali, an outstanding rider of his time, was American champion on a Harley-Davidson DAH in 1932, 1933, 1935 and 1936. The classic hill climbing route was between 200 and 600 feet (60 to 180 m) long and 30 feet wide; the driver was allowed to start 30 feet from the start line.
literature
- Stephen Wright: American Racer, 1900-1940 . Megden Publishing Co. 1979, ISBN 0-9603676-0-8 .
Web links
Individual evidence
- ↑ Stephen Wright: American Racer , p. 203.
- ^ Motorcycle Classic: Hillclimbing in America . 11/2016, pp. 104–113.
- ↑ AMA Motorcycle Hall of Fame Joe Petrali
- ↑ U.S. Patent No. 68495
