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 the condition of metal main bearings after an endurance test.
| Identifier | ExFiles\Box 114\2\ scan0188 | |
| Date | 21th September 1935 guessed | |
| UPPER HALVES <-- 1 TO 7 --> B-16 Unit. 6.8:1 Comp. Ratio. Hall's metal main bearings after 42 hrs. 30 mins. endurance as follows :- 1st 30 hrs. at 4,000 r.p.m. full throttle. Following 12 1/2 hrs. as follows for each hour:- 30 mins. at 4,000 r.p.m. full throttle. 25 mins. at 4,250 " " 5 mins. at 4,500 " " | ||