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).
Performance test data from a 20 HP vehicle during trials in Switzerland, continued from a previous test.
| Identifier | ExFiles\Box 24\4\ Scan175 | |
| Date | 22th August 1924 guessed | |
| 20 HP. TESTS IN SWITZERLAND - CONTD : Conditions of test :- Same as previous test. Bonnet on exhaust side opened. Temp. was brought up to 73° but was lost in opening bonnet etc. TABLE DATA: Column Headers: Air Temp., Temp. of Radiator Top., Temp. of Radiator Bottom., Distance travelled kilomtrs., Height climbed. metres., Ignition, Throttle., Gear., Condition of car., Time mins., kilo per Row 1: 18°C, 64°C, 57.8°C, 8.223, 600, Battery. full advanced., Full, 2nd., Four passengers. Bonnet open on exhaust side., 0 Row 2: [blank], 63, 57.8", [blank], [blank], ", ", ", ", 1 Row 3: 16.5, 64.5", 58.9", [blank], 620, ", ", ", ", 2 Row 4: [blank], 66, 60", [blank], [blank], ", ", ", ", 3 Row 5: 16, 68", 62.2", [blank], 690, ", ", ", ", 4 Row 6: [blank], 69", 63.3", [blank], [blank], ", ", ", ", 5 Row 7: 15.5, 71", 65", [blank], 760, ", ", ", ", 6 Row 8: [blank], 71.5", 65.6", [blank], [blank], ", ", ", ", 7 Row 9: 15, 71", 65.6", [blank], 820, ", ", ", ", 8 Row 10: [blank], 72", 66.7", [blank], [blank], ", ", ", ", 9 Row 11: 15, 72.5", 66.7", [blank], 880, ", ", ", ", 10 Row 12: [blank], 73", 67.2", [blank], [blank], ", ", ", ", 11 Row 13: 15, 74.5", 66.7", [blank], 940, ", ", ", ", 12 Row 14: [blank], 73", 65.6", [blank], [blank], ", ", ", ", 13 Row 15: 14.5, 72.5", 65.6", [blank], 1000, ", ", ", started to rain, 14 Row 16: [blank], 72.5", 66.1", [blank], [blank], ", ", ", continued., 15 Row 17: 14, 74", 66.7", [blank], 1080, ", ", ", ", 16 Row 18: [blank], 73", 66.7", [blank], [blank], ", ", ", ", 17 Row 19: [blank], 74", 66.7", [blank], 1190, ", ", ", ", 18 Row 20: 12.5, 72", 65.6", [blank], [blank], ", ", ", ", 19 Row 21: [blank], 72", 65.6, 8.234, 1220, [blank], [blank], [blank], 19.20 | ||