Rolls-Royce Archives
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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).
Graph comparing car overheating temperatures under various bonnet and undershield ventilation configurations.

Identifier  ExFiles\Box 14\7\  Scan020
Date  2nd July 1930 guessed
  
GRAPH II
STANDARD P.II CABRIOLET 19 E.X. AXLE RATIO 14 x 52 WT. 48 CWT EMPTY.
TEMP AT WHICH CAR WILL OVER-HEAT EVENTUALLY (100°C - TOP WATER TEMP)
TEMP SCALE: 10°C, 20°C, 30°C, 40°C, 50°C

TEST CONDITIONS & RESULTS:
STANDARD No VENTILATION: 35°C.
REAR BONNET SHUTTERS OPEN ONLY: 37°C.
FRONT UNDERSHIELD OFF: 38°C.
FRONT BONNET SHUTTERS OPEN ONLY: 38.5°C.
FRONT AND REAR BONNET SHUTTERS OPEN: 41°C.
LOUVRED BONNET: 41.5°C.
LOUVRED BONNET VENTILATED FRONT UNDERSHIELD: 43.5°C.

NOTES:
FOR THIS TEST CAR DRIVEN AT A STEADY 60 M.P.H. ROUND BROOKLANDS TRACK. C.O. CLOSED. DURING TESTS ATS TEMP AVERAGED ABOUT 21°C. VARYING FROM 17°C TO 24°C (COMPENSATED FOR ON EACH TEST).
COMPARISON OF VARIOUS ALTERATIONS TO CAR.
STANDARD RAD. 6 m/m 7 1/2 m/m TUBES 4.00" DEEP FRONTAL AREA.
  
  


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