Test results for a WW flywheel, comparing configurations with and without a tail bearing at different speeds.
| Identifier | Morton\M13.2\ img025 | |
| Date | 13th January 1933 guessed | |
| IV G-6 {WW FLYWHEEL} WITHOUT TAIL BEARING 2500 3000 3000 WITH TAIL BEARING (BALL RACE) → 2900 3100 | ||
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).