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).
Solutions for high-speed steering wobble on the Phantom model.
| Identifier | ExFiles\Box 29\1\ Scan076 | |
| Date | 23th September 1925 | |
| 1457 to Hs.{Lord Ernest Hives - Chair} from DA.{Bernard Day - Chassis Design} c. to CJ. BY.{R.W. Bailey - Chief Engineer} c. to EP.{G. Eric Platford - Chief Quality Engineer} FN. DA{Bernard Day - Chassis Design}1/M23.9.25. PHANTOM STEERING. VISIT OF HS.{Lord Ernest Hives - Chair} EP.{G. Eric Platford - Chief Quality Engineer} RM.{William Robotham - Chief Engineer} ON THURSDAY 22ND. INST. X.8430 X.457 X.401 To deal immediately with the question of high speed steering wobbles it was decided that the following points should be attended to :- (1) The tyre press: not to fall below 50 lbs/sq.in. (2) The wheels and tyres should be balanced, a limit of not more than .250 lbs. out of balance being allowed. (3) The tyres should be reasonably true, and a customer should be instructed not to use a tyre which is badly out of truth. (4) The existing friction shock dampers should be set at 50 lbs. for the Phantom, and 40 lbs. for the 20 HP. (The above 4 points can be used to deal with existing complaints.) (5) It is desired to immediately adopt the .940 lead on the steering worm using the existing box etc. as recently instructed from here. As soon as possible the large worm with a .72 lead will supersede this, but the .940 lead small dia. worm should come in at once. (6) Since this slows the steering to 2.25 turns from lock to lock it is considered that two plain thrusts can be used in the axle instead of one plain and one ball as at present. This will help to damp out both low and high speed contd :- | ||