Abstract
In this paper the author deals with the special requirements for Diesel 'buses used for long-distance travel on the European continent. These 'buses travel over flat and mountainous countries, covering distances of between 300–400 miles per day at a regular speed of 50–60 m.p.h., while between 70 and 75 m.p.h. must be maintained on German Reichs-Autobahnen.
As they are regularly operated in the Alps they must have a high continuous output when working on long and steep gradients. The 'bus must be capable of climbing a gradient of approximately 20 per cent (1 in 5), and this necessitates a heavier transmission than is required in normal use. It is also essential that gear changing can be easily carried out. With steep gradients the normal braking system is not capable of doing all the work and it is therefore necessary to fit a special exhaust brake to the engine; details of this brake and the results obtained by fitting it are given. The influence of a throttle valve in the air intake is discussed.
Light steering and a small turning circle are important when descending steep gradients, and the high front axle load of approximately 5,000 kg. when descending necessitates special springs and tyres.
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