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).
Photographic record of B-15 unit big end and main bearings after endurance testing.
| Identifier | ExFiles\Box 82\4\ scan0163 | |
| Date | 21th September 1935 guessed | |
| UPPER HALVES 1 to 6 B-15 Unit. 6.8:1 comp. ratio. Big Ends:- 70/30 alloy RR. lead bronze, centri-cast after 82 hrs. at 4,000 r.p.m. No: 4 damaged - bolt failure. Main Bearings:- 50/50 alloy RR. lead bronze, after 25 hours at 4,000 r.p.m. | ||