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 charting the results of fan tests on a 3½ Litre Bentley, measuring water temperature rise over time at different engine speeds.
| Identifier | ExFiles\Box 135\1\ scan0032 | |
| Date | 9th September 1933 | |
| 3½ LITRE BENTLEY FAN TESTS (CHASSIS 4 - BIV) WATER TEMPERATURE RISE - LIGHT RUNNING - WATER AT 80°C AT COMMENCEMENT OF TEST N.B. ALL TEMPERATURE FIGURES REDUCED TO AIR TEMP OF O°C Top Graph: 600 ENGINE R.P.M. BOILING Bottom Graph: 400 ENGINE R.P.M. Y-Axis Label: WATER TEMPERATURE RISE (DEGREES CENTIGRADE) X-Axis Label: TIME (MINS) Legend: PEREGRINE FAN 20/25 H.P. FAN CHRYSLER FAN NO FAN Note: CHRYSLER & 20/25 H.P. FANS FITTED WITH .50" CLEARANCE BETWEEN FAN BLADE & RADIATOR MATRIX. AT FANS NEAREST POINT TO RADIATOR | ||