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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).
Comparison table of radiator specifications including dimensions, hydraulic resistance, and weight.

Identifier  ExFiles\Box 24\5\  Scan213
Date  13th January 1930 guessed
  
RADIATOR. Tube Dimensions Hydraulic Resistance on Rig Time Wt. Rad. Wt. Rad.
Series & Piece No. & Piece No. for 60 galls. Empty. Full.

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

F2B. Series E.79444 96 secs. 110 lbs. 160.5 lbs.
E76044 Large Gap. 5½ - 7 mm. Water capacity 4.95 galls.

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

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

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

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

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

+ 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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