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).
Summary table of engine faults reported for 20 HP, 25 HP, Ph.I, and Ph.II models.
| Identifier | ExFiles\Box 47\2\ Scan353 | |
| Date | 1st September 1930 guessed | |
| -9- 20 HP. 25 HP. Ph.I. Ph.II TOTAL. REMARKS. ENGINE - WATER PUMP FABRIC DRIVE. September quarter. 10 2 - - 12. Previous 8 1 - - 9 Six months. 18 3 - - 21. ENGINE - CHATTER AT HIGH SPEED. September quarter. - - 4 - 4 Previous - - 4 - 4 P. changed valve springs to Ph.II type Six Months. - - 4 - 4 ENGINE FEET - BOLTS BROKEN. September quarter. - - - 1 1 Previous - - - 1 1 Six months. - - - 1 1 ENGINE - WATER LEAKS FROM CYLINDER. September quarter. 3 - 3 1 7 Previous - - 4 - 4 Six months 3 - 7 1 11 | ||