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).
Photograph showing a set of big end bearings and caps after a test run.
| Identifier | ExFiles\Box 97\1\ scan0035 | |
| Date | 21th January 1937 guessed | |
| 14 C.15 (25/30) UNIT. BIG END BEARINGS. STANDARD AC7 METAL. HAVE RUN 12,400 MILES IN 21 GIV AND 143 HOURS ON TEST BED, 83 HOURS OF WHICH AT 4,000 R.P.M. FOR OIL CONSUMPTION. ← 1 TO 6 → Stamped on parts: 1 M, 2 M, 3 M, 4 M, 5 M, 6 M | ||