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).
Mitigating high-speed wobbles and road shocks through tyre selection, balancing, and a new damped pendulum lever design.
| Identifier | ExFiles\Box 29\1\ Scan037 | |
| Date | 11th September 1925 guessed | |
| Contd :- o2o the same object we have sent a new box with larger dia. worm so as to further reduce the feeling of road shocks. A damped pendulum lever will be used for this also as soon as a simple design is completed. It will be realised that we have been able to do tx nothing definite for high speed wobbles more than (1) avoid balloon tyres on the front wheels of Phantom, but they can be used on India if shock dampers are improved, (2) always recommend drivers who wish to drive up to and over 60 m.p.h., to be sure to balance the road wheels, and to pump tyres to 50 lbs. per sq.in. and keep the shock dampers working efficient ly, (3) to reduce the weight of the front axles, front brakes, and road wheel hubs, to the very minimum. We have been working on the damping of the pendulum lever but we find that in the position arranged as you now have it it is difficult to get the efficiency, owing to the very small movement of the surfaces and springs. We have however sent you particulars of the stiffness of the springs, but we fear this apparatus in that position is too heavy for its efficiency. We are therefore to carry the damper lower down the pendulum lever, so that the angular movement is 6 times greater, and therefore its efficiency both xx in damping and springing much easier. R.{Sir Henry Royce} | ||