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).
Report comparing boom and vibration issues between vehicles 17-G4 and 12-G4.
| Identifier | ExFiles\Box 137\4\ scan0130 | |
| Date | 1st December 1930 | |
| FOR FILES. A634' Dec.1930. 17-G4 - 12-G4. BOOMS. { 17-G4 in standard condition. { 12-G4 with no torque reaction dampers or bottom rubbers of rear engine feet. On 12-G4 the boom at 50 m.p.h. and the vibration at 40 were reduced by removing the torque reaction dampers. When 12-G4 was hot the booms were very little better than those in 17-G4, but 17-G4 had not got the 40 m.p.h. vibration. The overrun booms in 17-G4 included that at 35 m.p.h. in third due to exhaust which we have cured in 12-G4. There is a carburetter roar on 17-G4. from 40 m.p.h. upwards tending to make the body boom. Hs{Lord Ernest Hives - Chair}/H.Grylls. | ||