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).
Comparison of engine cooling performance between a three-bladed fan and a standard fan on vehicle 98-NK.
| Identifier | WestWitteringFiles\L\2April1924-June1924\ Scan31 | |
| Date | 29th June 1924 | |
| COPY. Chateauroux. June 29th,1924. FAN TESTS ON 98-NK. Condition of tests. Full throttle, braking down to required speed. All tests taken under exactly similar conditions as regards roads and direction of motion. T1 = Temp: at start of run in °C. T2 = " finish " " " T2 - T1 = Increase in engine temp. during test. Air temp. during tests = 23.5°C. Bonnet shutters open. | FAN WITH THREE BLADES. | | | | | |---|---|---|---|---| | T1 | T2 | T2 - T1 | Distance miles. | Speed m.p.h. | | 84° | 92.5° | 8.5° | 1 | 20 | | 85° | 93° | 8° | 1 | 30 | | 88° | 92° | 4° | 1 | 40 | | 86.5° | 91° | 4.5° | 1 | 50 | | 90° | 92° | 2° | 2 | 60 | | STANDARD FAN. | | | | | |---|---|---|---|---| | T1 | T2 | T2 - T1 | Dist: miles. | Speed m.p.h. | | 84° | 90° | 6° | 1 | 20 | | 85° | 93° | 8° | 1 | 30 | | 89° | 94° | 5° | 1 | 40 | | 89° | 94° | 5° | 1 | 50 | | 86.5° | 90° | 3.5° | 2 | 60 | The above results shew that the three bladed fan reduces the possibility of boiling during high speed work, but is slightly less efficient than the standard fan at low speeds. Hs{Lord Ernest Hives - Chair}/AJL. | ||