Issues with the 'India' front axle brake levers becoming choc-a-bloc with the axle under load.
| Identifier | ExFiles\Box 101\1\ scan0015 | |
| Date | 23th May 1925 | |
| R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. ✓5420 REF Hs {Lord Ernest Hives - Chair} /Rm {William Robotham - Chief Engineer} 1/LG23.5.25. To R. {Sir Henry Royce} from Hs {Lord Ernest Hives - Chair} /Rm. {William Robotham - Chief Engineer} c. to CJ. BJ. c. to RG. {Mr Rowledge} E. {Mr Elliott - Chief Engineer} c. to DA. {Bernard Day - Chassis Design} BY. {R.W. Bailey - Chief Engineer} c. to Wor. {Arthur Wormald - General Works Manager} S E C R E T. 'INDIA(Production 20 HP. with 4-speed box and Front Wheel Brakes)' FRONT AXLE BRAKE LEVERS. We find that on 'India(Production 20 HP. with 4-speed box and Front Wheel Brakes)' the two small operating levers on the front axle, G.51790, will become choc-a-bloc with the axle whenever the brakes are applied with any force. It is impossible to prevent this happening unless the shoes are set so that the brakes are permenently rubbing. We applied a load on the brake rope operating this lever with the car stationary, having previously adjusted the shoes so that they were just clear of the drum and no more. We found that a load of 240 lbs. on the rope was sufficient to cause this lever to foul the axle. We observed that the drum sprung approx. .025" at the shoe centre during the test. We repeated the test on an EAC. axle. We found that the movement occasioned by springing at the end of the corresponding lever on this axle was 1.1" for a 400 lb. load. This lever having considerably greater range of movement than that of 'India(Production 20 HP. with 4-speed box and Front Wheel Brakes)' it did not foul the axle. It will be observed from the following figures that the spring due to unit load, is greater on 'India(Production 20 HP. with 4-speed box and Front Wheel Brakes)' than on the EAC. We are analysing the lost movement in the linkage to account for this. contd :- | ||
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).