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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).
Comparative table of radiator specifications.

Identifier  ExFiles\Box 15\1\  Scan199
Date  13th January 1930 guessed
  
RADIATOR. Series & Piece No.    Tube Dimensions & Piece No.    Hydraulic Resistance on Rig Time for 60 galls.    Wt. Rad. Empty.    Wt. Rad. Full.

V.{VIENNA} Series E73892/3.    E.18491 8 - 7 mm.    100 secs.    126.5 Water Capacity.    169.75 4.25 galls.

F2B. Series E76044 Large Gap.    E.79444 5¼ - 7 mm.    96 secs.    110 lbs. Water capacity    160.5 lbs. 4.95 galls.

F2B. Series Small Gap.    6 - 7 mm.    117 secs.    OBSOLETE

Phantom II Small Gap.    6 - 7 mm.    125 secs.    129¼ lbs. Water capacity.    171 lbs 10 ozs. 4 galls.

Phantom II Large gap. E.77675.    E.79448 6 - 7½ mm.    105 secs.    119.5 Water capacity.    168.5 5 galls.

20 HP. E.55062    E.53375 7 - 8 mm.    165 secs. +    92.4 lbs. Water capacity.    123.25 lbs. 3.1 galls.

Chrysler After 10,000    Zig-Zag ribbon considerable. Indirect cooling.    122 secs.†    61.6 lbs. Water capacity.    93 lbs. 2.15 galls.

+ These figures are comparable with one another but not with the 40/50 figures owing to the different size of inlet pipe to the radiator top tank. We are making further tests to bring 20 HP. and 40/50 to a common basis.

Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}
  
  


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