Valve rockers for K.E. J.B.S. which were trialled on a 'Hawk' engine and found to offer no advantage.
| Identifier | ExFiles\Box 42\2\ Scan040 | |
| Date | 8th September 1919 | |
| EH/AT1 8.9.19. X.3288.-VALVE ROCKERS IN K.E. J.B.S. The above rockers were fitted on "Hawk(Aero Engine)" engine but found to be no advantage. EH. | ||
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).