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).
With diagrams proposing the use of friction dampers to reduce torque reaction vibration in the 40/50 and Goshawk models.
| Identifier | WestWitteringFiles\K\July1923\ Scan38 | |
| Date | 26th July 1923 | |
| TO HS.{Lord Ernest Hives - Chair} FROM R.{Sir Henry Royce} ORIGINAL R4/M26.7.23. RE. TORQUE REACTION VIBRATION. X4604 X9550 (crossed out) Your experiments of reducing the reaction vibrations by tightening the front suspension of the 40/50 rather opened our eyes to the advisability of modifying the suspension so as to damp the present undamped flexibility caused on both Goshawk and 40/50 by the slight vertical bending of the frame side members. As far as we can see at the moment we ought to get good improvement if we could arrange very rigid and powerful friction dampers between the engine and the frame as far as possible forward, that is, as near the front axle as we can, but there must, to be successful, no flexibility or slack between the frame and the engine. If we could mount the 40/50 engine rear end at the front, this might do well; as an alternative we might add friction to the compensating suspension thus:- FRICTION HERE On Goshawk and EAC. we might move the damper as far forward as possible:- RIGID LEVERS HALF TIME WHEELCASE FRICTION HERE R.{Sir Henry Royce} | ||