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).
Characteristics of Phantom III type steering joints, comparing them to Bentley and 25 HP types.
| Identifier | ExFiles\Box 95\1\ scan0298 | |
| Date | 12th May 1936 | |
| To E.{Mr Elliott - Chief Engineer} c. to Wor.{Arthur Wormald - General Works Manager} c. to By.{R.W. Bailey - Chief Engineer} c. to Da.{Bernard Day - Chassis Design} c. to Ev.{Ivan Evernden - coachwork} X 350 Hs{Lord Ernest Hives - Chair}/FJH.{Fred J. Hardy - Chief Dev. Engineer}17/KW.12.5.36. Phantom III Type Steering joints. As requested in E.1/HP.23.436, we attach a diagram showing the form of damping obtained from the Bentley and Ph.III types of cross steering tube joint. This shows that the characteristics of the two types of joint are very different as anticipated in the above memo. As can be seen, the Ph.III joint moves before the applied load reaches half the full friction load. This is because, when the joint comes to rest, the spring is wound up in the direction of the previous movement and at first assists movement in the opposite direction. This effect becomes less as the amplitude of swing of the joint becomes less than the amount of wind up of the spring. This characteristic of the Ph.III type of joint would appear to make it unsuitable in its present form for the Bentley and 25 HP. and must be a disadvantage on the Ph.III. We are experimenting with a simple way of preventing the spring loaded pad from rotating with respect to the housing. Hs{Lord Ernest Hives - Chair}/F.J.Hardy. | ||