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).
Vehicle performance including weight, acceleration, consumption, and hill climb tests.
| Identifier | WestWitteringFiles\K\November1923\ Scan11 | |
| Date | 12th July 1923 | |
| R.R. 402A (40 H) (SL 42 12-7-23). J.H., D.{John DeLooze - Company Secretary} -4- EXPERIMENTAL REPORT. Expl. No. 4609 REF H24/LGB. 11.23. RUNNING CONDITION :- Tool kit, spare wheels, petrol - no passengers - TOTAL WEIGHT - 4984 lbs. Front - 2492 lbs. N.S. 2492 lbs. Rear - 2492 lbs. O.S. 2492 lbs. ACCELERATION. M.P.H. | TOP GEAR. | SECOND GEAR. | BOTTOM GEAR. 10 | 2.25 f.p.s. | 3.8 f.p.s. | 5 f.p.s. 15 | 2.5 f.p.s. | **** | 4 f.p.s. 20 | 2.2 f.p.s. | 3.3 f.p.s. | 2.7 f.p.s. 30 | 1.8 f.p.s. | 2.6 f.p.s. | ***** 40 | 1.325 f.p.s. | 1.5 f.p.s. | ***** 50 | .9 f.p.s. | **** | ***** 55 | .45 f.p.s. | **** | ***** TRACTIVE RESISTANCE. M.P.H. | Lbs. per ton. 55 | 122¼ 50 | 100 40 | 83 30 | 67 20 | 53 10 | 41 PETROL CONSUMPTION: - 16.34 M.P.G. at 30 M.P.H. PERFORMANCE ON PISTERN HILL. Start. | Max. | Min. | Finish. | Time. 10 | 40 | 22 | 27 | 1 min. 51 4/5 secs. 10 | 42 | 22 | 29 | 1 min. 45 3/5 secs. 10 | 44¼ | 24 | 32 | 1 min. 42¼ secs. A good 20 HP. R-R | ||