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).
Radiator tests at Brooklands measuring water temperature differences between the engine and radiator under various conditions.
| Identifier | ExFiles\Box 101\1\ scan0217 | |
| Date | 31th March 1936 | |
| Steadman. X500a CHASSIS NO. 22 G.V. 31.3.36. The difference between Cyl block & Radiator is so great that we ought to get G.W.H. to make a mod. Radiator Tests at Brooklands. 1. Header tank half full. Max speed, full throttle. Air temperature 14 c. Head wind on Railway Straight. Following wind past Vickers Shed. WATER TEMP. IN ENGINE. WATER TEMP. IN RADIATOR. DIFFERENCE. 81 c. 75 c. 6 c. 87 80 7 88 80 8 82 75 7 85 80 5 85 78 7 Average. 84.6 c. 78 c Mean difference 6.6 c 2. Header tank empty. (matrix just covered) Conditions as above. Mirror fitted to observe shutters. WATER IN ENGINE. WATER IN RADIATOR DIFFERENCE SHUTTER POSITION. 76 c. 72 c. 4 c. Half open. 90 1/2 80 10 Open. 83 75 8 " 79 71 8 Half open. 83 75 8 " " 85 80 5 " " 89 81 8 Open. 83 75 8 " 80 72 8 Half open. 81 75 7 3/4 open. 80 72 8 Half open. 82 77 5 " " {Slowed down} 82 75 8 Open. Average 83 c. 75.4 c 7.6 c. 3. Same conditions as 2, but at reduced speed. WATER IN ENGINE WATER IN RADIATOR DIFFERENCE SHUTTER POSITION. 75 c. 65 c 10 c. Closed. Half open. 79 70 9 Half open. 77 69 8 " " {Speed increased} 86 80 6 " " 80 71 9 " " Average 79.4 c. 71 c. 8.4 c. | ||