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From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Acceleration test results for vehicle 25-EX, showing times for various speed increments.

Identifier  ExFiles\Box 11\3\  03-page402
Date  6th July 1931
  
87941.
6.7.31.
ACCELERATION TESTS ON 25-EX.

First Table:
M.P.H. | OUT Secs. | IN Secs. | AVERAGE.
10 - 20 | 4.2 | 4.3 | 3.9 | 4.0 | 4.1
20 - 30 | 4.4 | 4.4 | 4.1 | 4.2 | 4.3
30 - 40 | 4.8 | 4.8 | 4.2 | 4.2 | 4.5
40 - 50 | 5.4 | 5.8 | 5.8 | 5.8 | 5.7
50 - 60 | 6.5 | 6.6 | 6.3 | 6.2 | 6.4
60 - 70 | 9.2 | 9.0 | 8.0 | 8.2 | 8.6

Second Table (From Addition):
10 - 30 | 8.8 | 9.6 | 8.0 | 8.0 | 8.35 | 8.4
10 - 40 | 13.8 | 13.6 | 12.5 | 12.8 | 13.2 | 12.9
10 - 50 | 19.7 | 19.0 | 17.3 | 19.0 | 18.25 | 18.6
10 - 60 | 25.8 | 25.7 | 23.8 | 23.2 | 24.6 | 25.0

A slight cross wind was if any blowing in the I.N. direction.
Leslie. G.H.A.
Brazier.
  
  


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