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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 of calculations for lift on flank, lift on involute, total lift, and base circle radius.

Identifier  ExFiles\Box 174\2\  img238
Date  27th December 1937
  
WILCOX-RICH CORPORATION
Division of
Eaton Manufacturing Company

4.

Mr. W. A.{Mr Adams} Robotham

December 27, 1937

9. Lift on flank: l_fl = E_fl x (1 - cos β') ¢
10. Lift on involute: l_i = .0174533 x D/2 x B°
11. Total lift: l = l_fl + l_i + l_p
12. Base circle radius: R_B = R_N + R_W - l

.0174533 is conversion factor. written as degrees. degrees to radians.
  
  


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