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. | ||