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).
Modifications and tests to diagnose braking and steering issues, specifically 'jaggers'.
Identifier | ExFiles\Box 30\6\ Scan145 | |
Date | 1st January 1924 | |
R.R. 495A (40 H) (SL 42 12-7-23). J.H.D. -3- EXPERIMENTAL REPORT. Expt. No. 9940 REF:hsd/LG11 1 24. brake pedal to prevent the sudden application. The following experiments have been tried and the tests prove that these modifications do not affect jaggers. 1. Jointed shoes. We have tried shoes jointed in various positions. 2. Strength of road springs. In one case we have replaced the road springs by a piece of wood - the top plate of the springs has been clamped solidly to the wood and the wood fixed to the axle by the usual clips. This made no difference. 3. Rebound leaves to road springs. 4. Struts between pivot and brake carrier to stiffen the brake carrier. This we made to a scheme sent through by DA.{Bernard Day - Chassis Design} 5. Modified operation to ensure brakes released when axle twists. As jaggers can be produced going backwards on a std. car, this confirms that the operation is not the cause. 6. Either more or less leverage to the brakes. 7. Slack in brake shoe pivot. 8. Tyre pressures or Balloon tyres. 9. Fixing front end of front springs in place of radius rods. 10. Arms from axle connected to the shock absorber. We propose carrying this out again because we believe if we get sufficiently rigid arms connected to the shock absorber, this must prevent it. 11. Slack in joints of operating mechanism. We have examined the brake drum after excessive jaggers and they show distinct marks at regular intervals which indicate locking or slipping of the shoe on the drum. AFFECT OF BRAKES ON STEERING. If we have unequal braking on the front wheels it tends to steer the car. We have proved that whichever side contd:- | ||