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).
Series of graphs from radiator tests on Cat and Fiddle Hill, showing how overheating is reduced by climbing on indirect gears.
| Identifier | ExFiles\Box 113\2\ scan0066 | |
| Date | 16th September 1924 | |
| RADIATOR TESTS. CAT AND FIDDLE HILL. OVER-HEATING REDUCED BY CLIMBING ON INDIRECT GEARS. Y-AXIS: TEMPERATURE RADIATOR C° X-AXIS: DISTANCE CLIMBED MILES. CHART A: CONSTANT ROAD SPEED FAN SPEED VARIED. TOP RADIATOR TEMPS. MEAN AIR TEMP. 14°C. SPEED 25 M.P.H. - DIRECT DRIVE FAN R.P.M. 1040 - 2ND SPEED FAN R.P.M. 2320 - 3RD SPEED FAN R.P.M. 1550 CHART B: CONSTANT ROAD SPEED. FAN SPEED VARIED. TOP RADIATOR TEMPS. MEAN AIR TEMP. 14°C. SPEED 20 M.P.H. - 3RD SPEED - 2ND SPEED CHART C: CONSTANT FAN SPEED. ROAD SPEED VARIED TOP RADIATOR TEMPS. MEAN AIR TEMP. 13°C. FAN R.P.M. 1550 - 3RD SPEED 30 M.P.H. - 2ND SPEED 20 M.P.H. - 1ST SPEED 13 M.P.H. 16/9/24. | ||