Re: What is a 38's theoretic top speed?
David Bromage (dbromage@metz.une.edu.au)
17 Oct 1997 10:13:58 GMT
David Johnson (trainman@ozemail.com.au) wrote:
>Graham Morphett wrote:
>
>> Has anyone done the calcs to show what a 38 can really do?
>
>No, but I doubt that the claims of 160+ are justified. I would say 140-150 km/h would be
>a realistic expected top speed. Anybody got kilometre times to confirm this?
A rough rule of thumb for the maximum possible speed is 1mph for every
inch of driving wheel circumference.
Long travel valves means a little faster than that. For example a British
Rail 9F was once timed at 90mph, which means the wheels would have been
making 4 revolutions per second.
Cheers
David