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 showing the ambient temperature at which a Standard PII Cabriolet will overheat under various ventilation conditions.

Identifier  ExFiles\Box 24\5\  Scan241
Date  2nd July 1938 guessed
  
GRAPH II
STANDARD PII CABRIOLET 19 EX. AXLE RATIO 14 x 52 WT 48 CWT EMPTY
TEMP. AT WHICH CAR WILL OVER-HEAT EVENTUALLY (100°C - TOP WATER TEMP.)
10°C 20°C 30°C 40°C 50°C
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
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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