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 and test results for Hoyt's Metal Main Bearings from a No.4 Test Bed Unit.
| Identifier | ExFiles\Box 115\2\ scan0422 | |
| Date | 17th February 1939 guessed | |
| W.111 No.4 Test Bed Unit. Hoyt's Metal Main Bearings. Running time, full throttle - 18 hours 15 mins. Part throttle - 37 hours 25 mins. Total - 55 hours 40 mins. Oil Inlet of 100°C 4000 R.P.M. Please note: No.7 Rear Thrust Bearing is standard R.R. white metal, as Crankshaft used is the old type with a longer bearing 2.125. | ||