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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).
Table of coefficients of discharge for head 3, detailing various bore lengths and diameters.

Identifier  ExFiles\Box 36\1\  scan 061
Date  9th February 1917 guessed
  
-6-

(b) TABLE OF COEFFICIENTS OF DISCHARGE FOR HEAD 3.

Length of Bore:-
1/2" 3/4" 1 1/4" 2" 2 3/4" 3 1/2" 4 1/2"
Diam:of bore.
3/64" { Rad.in. .81 .76 .64 .56 X X X } A
{ Rad.out. .79 .72 .61 .55 X X X

3/32" { Rad. in X .84 .82 .77 .73 X X } B
{ Rad. out. X .82 .81 .79 .69 X X

1/8" { Rad. in. X X .87 .81 .79 .74 X } C
{ Rad. out. X X .80 .76 .74 .74 X

3/16" { Rad. in. X X X .88 .83 .81 .81 } D
{ Rad. out. X X X .83 .81 .80 .78
  
  


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