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).
Log of failures for Borg & Beck clutches.
| Identifier | ExFiles\Box 129\3\ scan0086 | |
| Date | 21th January 1936 | |
| FAILURES OF BORG & BECK CLUTCHES. no 27 Date | Type | Unit | Bed | Time of Failure | Type of Failure | Remarks 16.12.35. | 10A3 | B-14 | K-10 | Within 95 hours | Pressure plate broken (See Hs{Lord Ernest Hives - Chair}/Smth.20/KW. 6.1.36). | 31.12.35. | 10A6 | B-14 | 5 | Within 30 hours | 1 eyebolt failed under nut and across threads. | | 11A6 | B-15 | K-10 | Within 10 hours | All four eyebolts failed in threaded portion. 2 opp. ones under nut and other 2 across split pin hole. | 21.1.36. | 10A6 | B-14 | 5 | Between 17 & 18 hours. | 1 eyebolt failed under nut and across threads. | This clutch had improved balancing. | ||