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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).
Data table showing coefficients of discharge for varying bore lengths and diameters.

Identifier  ExFiles\Box 36\1\  scan 060
Date  9th January 1917 guessed
  
-5-

(b) COEFFICIENTS OF DISCHARGE FOR HEAD 2.

Length of Bore
Diameter of Bore. ½" ¾" 1¼" 2" 3½" 3¾" 4½".

3/64 { Rad. in. .82 .74 .69 .615 X X X } A
{ Rad. out. .80 .74 .68 .61 X X X

3/32" { Rad. in. X .89 .88 .83 .80 X X } B
{ Rad. out. X .83 .83 .82 .715 X X

¼" { Rad. in. X X .92 .88 .865 .79 X } C
{ Rad. out. X X .835 .81 .76 .75 X

3/16" { Rad. in X X X .895 .865 .85 .845 } D
{ Rad. out. X X X .84 .83 .82 .805
  
  


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