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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).
Typed memorandum concluding that the Andreau formula for rolling resistance is valid up to 80 M.P.H.

Identifier  ExFiles\Box 161\1\  scan0249
Date  1st December 1938
  
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Rm{William Robotham - Chief Engineer}/TAS.{T. Allan Swinden}14/JH.1.12.38.

It has already been shown that the value of K obtained from the Andreau formula is identical with that obtained from first principles on the dyno.

The table of values of K obtained by the former method throughout the speed range shew K to be quite independant of speed.

It therefore seems fair to infer that, despite previous evidence to the contrary, K is independent of speed, and hence that the Audrean formula for rolling resistance holds good, at any rate up to 80 M.P.H.

Rm{William Robotham - Chief Engineer}/T.A.Swinden.
  
  


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