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).
Speed table for a chassis on top gear, showing miles per hour and corresponding revolutions per minute.
| Identifier | ExFiles\Box 4\8\ 08-page01 | |
| Date | 29th November 1915 | |
| X.469. X.469. X.2565. 29.11.15. SPEED TABLE FOR R.R. CHASSIS ON TOP GEAR. Miles per hour Revs. per min. Miles per hr. Revs. per min. 2 67 32 1074 4 134 34 1140 6 201 36 1208 8 269 38 1275 10 335 40 1342 12 403 42 1410 14 470 44 1476 16 536 46 1544 18 604 48 1610 20 671 50 1678 22 738 52 1745 24 805 54 1812 26 873 56 1880 28 939 58 1946 30 1006 60 2012 (upside down text at bottom) R.R. LTD. (A.M.) S.D.A. DRG. No 64-114 Rev. B (1963) | ||