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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).
Results of cooling tests carried out on an 8 B V (B III) car at Brooklands.

Identifier  ExFiles\Box 97\4\  scan0047
Date  14th October 1938 guessed
  
RESULTS OF COOLING TESTS CARRIED OUT ON 8 B V (B III) CAR AT BROOKLANDS.

TABLE DATA:

CONDITION OF TEST AS REGARDS CAR.
LOAD & SPEED CONDITIONS OF TEST
TOP WATER TEMP °C.
BOTTOM WATER TEMP °C.
DIFFERENCE TEMP DROP ACROSS RAD °C.
OIL TEMP °C.
AIR TEMP. DURING TEST.
CRITICAL AIR TEMPERATURE OF CAR (CORRECTED) NEGLECTING STEAM VALVE
REMARKS.

ROW 1:
Condition: ① RADIATOR AS STD. B III - 5 BLADE WRAITH FAN WITH /1 DRIVE RATIO
Load & Speed: FULL THROTTLE MAX. SPEED 89 M.P.H. LAP (OVERDRIVE GEAR)
Top Water Temp: 77
Bottom Water Temp: 67.5
Difference: 9.5
Oil Temp: 87.5
Air Temp: 17.5
Critical Air Temp: 39.0
Remarks:

ROW 2:
Condition: ② RADIATOR AS STD. B III - 5 BLADE WRAITH FAN WITH .85/1 DRIVE RATIO.
Load & Speed: FULL THROTTLE 40 M.P.H. (DIRECT GEAR)
Top Water Temp: 85.5
Bottom Water Temp: 76.0
Difference: 9.5
Oil Temp: 82.0
Air Temp: 18.5
Critical Air Temp: 32.5
Remarks:

ROW 3:
Condition: ③ RADIATOR AS STD. B III - 4 BLADE B.II FAN WITH .90/1 DRIVE RATIO.
Load & Speed: FULL THROTTLE MAX. SPEED - 89 M.P.H. (OVERDRIVE GEAR)
Top Water Temp: 80.5
Bottom Water Temp: 71.5
Difference: 9.0
Oil Temp: 96.0
Air Temp: 17.5
Critical Air Temp: 35.5
Remarks: NO DIFFERENCE IN SPEED BETWEEN ① & ③ CHECKED BY INDEPENDENT CAR.

ROW 4:
Condition: ④ RADIATOR AS STD. B.III - 4 BLADE B II FAN WITH .90/1 DRIVE RATIO.
Load & Speed: FULL THROTTLE 40 M.P.H. (DIRECT DRIVE)
Top Water Temp: 88
Bottom Water Temp: 78
Difference: 10.0
Oil Temp: 81
Air Temp: 14.5
Critical Air Temp: 26.0
Remarks: NOTE:- THESE FIGURES ARE ONLY APPROXIMATE & ARE ON LOW SIDE SINCE RAIN PREVENTED WATER ATTAINING STEADY TEMPERATURE.

ROW 5:
Condition: ⑤ RADIATOR AS STD. NO FAN
Load & Speed: FULL THROTTLE MAX. SPEED 89 M.P.H. (OVERDRIVE GEAR)
Top Water Temp: 91.5
Bottom Water Temp: 82.0
Difference: 9.5
Oil Temp: 100.0
Air Temp: 17.5
Critical Air Temp: 24.5
Remarks: NO DIFFERENCE IN SPEED BETWEEN ① & ⑤ CHECKED BY INDEPENDENT CAR.

NOTE:- CRITICAL AIR TEMPS. GIVEN ABOVE ARE CORRECTED FOR FALL OF WATER FLOW WITH TEMP. RISE, BUT DO NOT TAKE INTO ACCOUNT EFFECT OF STEAM VALVE. WITH 3 LBS/SQ" SETTING VALVE WILL RAISE ALL C.A. FIGURES BY 6°C.
  
  


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