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 results table showing speed and lap times under different car configurations.
| Identifier | ExFiles\Box 29\3\ Scan125 | |
| Date | 1st July 1925 guessed | |
| Top Headers: CONDITION OF CAR. | CORRECTED SPEEDOMETER. Car Specification: 98-NK. 15 X 52 2 passengers. Wt. of car complete - no passengers - 2 tons. 7 cwts. 1 qr. Table Data: Row 1: Condition: No side curtains. C.O. closed. Hood up. Best time for one lap: 2 mins. 20 Equivalent speed: 71.15 Best speed held on most favourable straight for wind: 73 Max. speed off member banking: 74 Row 2: Condition: Side curtains. Hood up. C.O. closed. Best time for one lap: 2 " 17 2/5 Equivalent speed: 72.5 Row 3: Condition: Hood down. C.O. closed. Best time for one lap: 2 " 14 2/5 Equivalent speed: 74.13 Best speed held on most favourable straight for wind: 76.0 Max. speed off member banking: 78 Row 4: Condition: Hood down ++ Top wind screen panel open. Spare wheel carriers off. C.O. closed. Best time for one lap: 2 " 13 Equivalent speed: 74.89 Row 5: Condition: Hood down ++ Top wind screen panel open. Spare wheel carriers off. C.O. open. Best time for one lap: 2 " 10 Equivalent speed: 76.62 Best speed held on most favourable straight for wind: 78/79 Max. speed off member banking: 80/81 Note: The number of laps in conditions marked ++ were hardly sufficient to ensure that the best possible lap had been attained. contd :- | ||