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).
Tests on a spring drive to eliminate engine gear rattle and oscillations.
| Identifier | ExFiles\Box 136\1\ scan0297 | |
| Date | 13th December 1933 | |
| -3- Ha/FJH.{Fred J. Hardy - Chief Dev. Engineer}3/KT.13.12.33. with the spring drive in this condition the engine was free from serious gear rattle under all conditions. The insipient rattle over the whole speed range was again in evidence due to the relatively large amount of damping. The spring drive was then tried without the balancing cam. This brought the critical oscillation in again. The damping was increased to 3 lbs. at 17 3/4" but it was still insufficient. Owing to lack of time it was not possible to try the effect of very much heavier damping. All the above tests were run with the fan in use. It is questionable whether the narrow cotton duck washer for the pinion damping will withstand, for any length of time, the heavy loads necessary to produce a damping of the order of 1 1/2 - 3 lbs. at 17 3/4". The spring drive at present on 10,000 miles test will show whether trouble is to be expected with this washer. Further experiments have yet to be carried out on this new damper and these will include the addition of inertia to the crank pinion. Ha/F.J.Hardy. | ||