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).
The performance and wear of 'Shoe X' brake lining, including diagrams of its rolling action.
| Identifier | WestWitteringFiles\K\December1923\ Scan60 | |
| Date | 12th July 1923 | |
| R.R. 493A (40 H) (SL 42 12-7-23). J.H., D.{John DeLooze - Company Secretary} Sheet 3. EXPERIMENTAL REPORT. Exptl. No. 3409 REF: Hs{Lord Ernest Hives - Chair}/BB1/LGS.12.23. Shoe X. Ferodo at toggle end only. On applying the brake in this case it was noticed that this portion of the shoe had a rolling action. Consequently the braking was affected by a narrow band of the lining only as shewn below :- light pressure on. brake hard on. Note :- This effect produced by mechanism and not by wrapping. Shoe X. Ferodo on both segments. We have run an 8 1/2 hrs. endurance test on this shoe. Load on axle tube lever 9 to 10 lbs. Average brake drum revs. under load - 236 - 395. It was found necessary to ease the load at intervals. After 4 hrs. running, brake squeaked badly and the engine had to be speeded up to maintain the average drum revs. Wear on shoe satisfactorily even but slightly in excess at centre of shoe. Hs{Lord Ernest Hives - Chair}/RB.{R. Bowen} | ||