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).
Wheel wobble, tramping speed, tyre pressure, and pivot angles.
| Identifier | ExFiles\Box 29\1\ Scan048 | |
| Date | 15th September 1925 guessed | |
| contd :- -2- parts of the wheels and axles, we shall get a tendency to wobble when the tramping speed sychronises with the road wheel speed, but we want to be sure of this. As you know we can lower the tramping speed by lower pressure in the tyres, and in a less degree by weak road springs, but we know that with the lightest axle without brakes, we can pass the tramping speed without wobbles, because if so, there are possibilities in design. We do not now think changes in the position and angles of the pivots within practical ranges will help us, but you should repeat the tests with vertical pivots, these being almost exactly within the tread. R.{Sir Henry Royce} | ||