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 from the Montlhéry track, including lap speeds and acceleration times.
| Identifier | ExFiles\Box 82\3\ scan0177 | |
| Date | 7th April 1935 | |
| COPY 420ra (3) Hotel de France, Chateauroux, Indre, France. 7th April, 1935. Tests on Monthlery Track on 6.4.35. 5-B-IV. Weight 1 ton, 13 cwts, 3 qrs, 14 lbs. Conditions High wind blowing against car on one side of track, dry surface; 15 gallons of petrol in tank; complement of tools; one spare wheel; driver only. Cutout opened and closed. Axle ratio.......... 10 x 43. Tyres............... 5.50 x 18 Silent Tread. Cutout Closed Lap Speeds.......... 1 min. 6.2/5 secs. 86.25 m.p.h. Engines Revs....max. 4,600 Min. 4,300. Cutout Opened Lap Speeds..........1 min. 5 secs. 88.2 m.p.h. Engine revs.... Max. 4,650 Min. 4,400 Oil temperature ... 98°C. Water " ... 78°C. Accelerations. MPH. Secs. MPH. Secs. 10 - 20 4.2/5 10 - 40 11.2/5 20 - 30 4. 40 - 60 10.3/5 30 - 40 3.4/5 60 - 80 18 against wind 40 - 50 4. 12 with wind. 50 - 60 6. 60 - 70 6.4/5 70 - 80 6.4/5 10 - 80 34.2/5 P.T.O. | ||