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 worn white metal main bearings from a Wraith III No.2 unit, with details of running times.
| Identifier | ExFiles\Box 115\3\ scan0151 | |
| Date | 15th December 1937 guessed | |
| WRAITH III NO.2 UNIT. MAIN BEARINGS. IN WHITE METAL. RUNNING TIMES : 1684 MILES ON ROAD & 122 HRS. 15 MINS. TOTAL RUNNING ON TEST BED INCLUDING 25 HRS. 30 MINS. FULL THROTTLE. THIS UNIT ALSO RAN 21 HRS. 50 MINS. ENDURANCE COMPRISING OF 4 HRS. AT 1/2 LOAD : 2 HRS. AT 1/4 LOAD : & 15 HRS. 50 MINS. FULL LOAD. | ||