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 data table for a 20 HP chassis (79-AO) during a 10,000-mile test.
| Identifier | WestWitteringFiles\K\October1923\ Scan50 | |
| Date | 12th October 1923 guessed | |
| PERFORMANCE OF 20 HP. CHASSIS (79-AO) DURING 10,000 MILES TEST. Start. 1000 2000 3000 4000 5000 6000 7000 8000 9000 Finish. After decarbonising. Speed. 53 53¼ 53 53¼ 52½ 53 53¼ 53½ 54 54 55 57.5 HILL CLIMB { Start 10 10 10 10 10 10 10 10 10 10 10 10 M.P.H. Max. speed. 38.5 38.5 37 37 38 37 37 37.5 37.5 38 39.5 39 m.p.h. Min. speed. 14.5 14 10 13 11 12 14.5 14 14.5 15 16 15 m.p.h. Finish. 22 23 17.5 22 22 22 23 22.5 23 22.5 24 23.5 m.p.h. Time. 2-10 2-11 2-19 2-9 2-17 2-14 2-3 2-8 2-2 2-2 1-58.5 2-3 mins. and secs. Slow 4.0 4.0 4.0 4.0 4.0 4.5 4.5 4.0 4.0 4.0 4.0 running on top gear. Speed tests are the average taken each way on a level piece of road passing the first point at 40 m.p.h. - the speed given is the speed obtained after 700 yards. Red Line fuel was used for all the tests. | ||