BMW R 10
The BMW R 10 scooter was a scooter project pursued by BMW from 1950 to 1955 with a single-cylinder four-stroke engine and cardan drive .
history
An early draft drawing of the R 10.b - draft 7.12.50 has the date of recording December 10, 1950. The additional designation ".b" was given to distinguish it from the project of the two-stroke motorcycle BMW R 10 from 1947, which had been abandoned in the prototype stage. A calculation of the product costs is available in the BMW archive as of January 1, 1950.
In 1955 the project was abandoned; From this year there is still a data file for determining manufacturing costs for the R 10 scooter and required investment capital for manufacturing in the BMW archive.
Design features
With the first design in 1951, a motorcycle-like concept was pursued, which then led to a smooth-surfaced design in the second version from 1953, which corresponded to the level of development of competitors such as Heinkel , Glas (Goggo-Roller) and Maico.
First execution
engine
The engine was designed as a longitudinally installed, wind-cooled single-cylinder four-stroke engine with a displacement of 200 cm³ and upright valves . Despite the low engine, it was difficult to climb through the fairing.
drive
The first version of the R 10 had a foot-shifted three-speed gearbox with cardan drive on the right side of the sprung rear wheel. This design corresponded to the motorcycles from BMW.
landing gear
The large spoked wheels with a 16 "diameter were also closer to motorcycle construction than the contemporary scooters from other manufacturers.
Second execution
engine
As in the first version, the engine was a longitudinally installed single-cylinder four-stroke engine , but with overhead valves , 175 cm³ displacement and 12 HP (8.8 kW ). The cylinder head, with its valves arranged in parallel, was more compact than the cylinder head of the single-cylinder motorcycles and the Isetta, in which the valves were arranged in a V-shape. By shifting the motor to the rear, fan cooling and a short cardan shaft, a free passage could be achieved.
drive
The second version of the R 10 had a manual gearbox with cardan drive on the left side of the sprung rear wheel.
landing gear
The wheels were typically small ten-inch disc wheels and were guided in single-sided swings.
See also
Web links
- BMW R 10 scooter prototype. Model 210 (1st version). In: BMW history. BMW AG, accessed on September 19, 2017 (dossier of the BMW Group Archives).
- BMW R 10 scooter prototype. Model 210 (2nd version). In: BMW history. BMW AG, accessed on September 19, 2017 (dossier of the BMW Group Archives).
- Werner Cullmann: Small car museum Störy near Bockenem. (closed). Werner Cullmann, accessed on September 19, 2017 (A BMW R 10 scooter could also be seen in the now closed, at that time world's largest European small car museum in Störy.).
Individual evidence
- ↑ Motorrad 3/1974 , pp. 26–29.
- ↑ BMW R 10, scooter prototype first version. In: BMW history. BMW AG, 1951, accessed on February 23, 2018 (photo in the BMW Group Archive).
- ↑ a b BMW R 10 scooter prototype, second version, engine and chassis. In: BMW history. BMW AG, 1953, accessed on March 8, 2018 (photo in the BMW Group Archive).
