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).
Steering affects caused by the torsional movement of the axle under uneven four-wheel braking.
| Identifier | WestWitteringFiles\L\2April1924-June1924\ Scan81 | |
| Date | 12th July 1923 | |
| R.R. 493A (40 H) (SL 42 12-7-23). J.H., D.{John DeLooze - Company Secretary} EXPERIMENTAL REPORT. -1- Expl. No. REF: Hx/Bx/1/G15. 5. 24. STEERING AFFECTS WITH FOUR-WHEEL BRAKES. We have been investigating the way in which the axle twists up when one brake is applied more than the other. It has been proved practically that it is the torsional movement of the axle which tends to steer the car with un-even front braking. We have measured the alteration in the lean of the pivots due to braking. We did this by bringing the car to rest by braking sharply, maintaining pressure on the pedal and accurately taking the lean on the pivots. The pedal pressure was then released and another reading of the pivot lean taken. We carried out this test applying (a) both brakes simultaneously. (b) O.S. brake only (rather the better brake). (c) N.S. brake only - both the rear brakes were in action all the time. | Initial lean. Top of pivots. Backwards. | Method of Braking. | Lean after braking. Top of pivots. | | O.S. | N.S. | | O.S. | N.S. | | 1/16 | 3/32 | Both brakes. | .275 forward. | .265 forward. | | " | " | N.S. brake only.. | .050 " | 3/16 " | | " | " | O.S. " " | Vertical. | .200 " | It will be observed that with both brakes in action the pivots take a forward lean of just over 1/4". contd:- | ||