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).
Failure analysis report concluding that cracks originated from drill holes due to a low yield point and repeated bending stress.
| Identifier | ExFiles\Box 119\2\ scan0084 | |
| Date | 25th November 1919 | |
| H12/EB25.11.19. -2- of 340 and the interior 447. I consider that the failure is due to the soft surface having too,low a Yield Point, so that repeated bending stress has tended to originate cracks from the vicinity of drill holes. HCH. | ||