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).
Technical report discussing unsprung weight calculations, axle modifications, and tests on clutch couplings and helical gears.
| Identifier | ExFiles\Box 3\2\ 02-page025 | |
| Date | 20th May 1913 guessed | |
| AN/TSH1/L22413 (contd) 2. X200 a plain one this figure will become 45.75 lbs. Assuming that the whole of the torque tube and axle to be unsprung, the unsprung weight is affected as follows - Unsprung weight added Unsprung weight removed. Double brake axle with Torque tube and 895 X 135 plain wood wheels } 551 lbs Standard axle and torque tube with plain wood wheels 895 X 135 } lbs 474 Increase in unsprung weight. 551 474 --- 77 lbs. The whole of the extra weight is actually on the axle and is therefore unsprung. It is desirable to reduce the unsprung weight if possible, and I think immediate attention should be given to this important point. We have just received some plain clutch couplings and are about to make tests with these fitted in place of the damped spring coupling. The plain coupling centre weighs 2.75 lbs and the spring drive coupling centre weighs 10 lbs. The third axle is now on the road and has been fitted to chassis 23S1 which is about to be sent to Mr Royce. We have changed over the gears in axles No.1 & 2 and find the vibration to be with the gears and not with the axle casing. Axle No. 2 could not be made quiet and on testing the various parts it was found that the torque tube did not bolt up square with the axle. This has been corrected and the axle is now being re-set. X.58 - Double helical Gears for side shaft. These gears are still being used on the road and are | ||