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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).
Page detailing an approximate form of an equation for specific values related to air.

Identifier  ExFiles\Box 36\1\  scan 024
Date  21th February 1917 guessed
  
Contd. -12-

An approximate form of the first equation for values of D between 1 and .527 is

W = 1.1CA √[P1 (P1 - P2) / T1] * {1 + (P1 - P2) / (2n P1)}

(for air)

where n = γ = 1.405
  
  


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