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).
Trial report comparing various combinations of brush springs and brush materials for a starter motor.
| Identifier | ExFiles\Box 35\1\ scan 044 | |
| Date | 12th November 1919 | |
| X.2656 12.11.19. X.3082. X.2656. X.3348. TRIALS OF VARIOUS COMBINATIONS OF BRUSH SPRINGS AND BRUSH MATERIAL ON R.R. STARTER MOTOR. Lever Ratio 5:1 TABLE DATA: Column Headers: Spring, Brush Material (C.M., C.M.2., C.M.3.) ROW 1: Spring: Original standard weak spring. G.2900 (4 lb). 2.1 lb/[]" C.M.: Results obtained unsatisfactory. C.M.2.: [Crossed Out] C.M.3.: [Crossed Out] ROW 2: Spring: New standard spring. F.7180. (6 lb). 3.2 lb/[]" C.M.: Results obtained passable but not absolutely satisfactory. Normal load. Failure obtained under extra heavy load. C.M.2.: V.{VIENNA} Good under extra heavy load. C.M.3.: V.{VIENNA} Good under extra heavy load. ROW 3: Spring: Experimental strong spring. N.1760 (9 lb). 5 lb/[]" C.M.: O.K. on Expl. motor. Normal load. O.K. on Expl. motor under extra heavy load. C.M.2.: O.K. on Expl. motor. Normal load. O.K. on Expl. Motor under extra heavy load. Hot. C.M.3.: Results O.K. on motor No.74. Normal load. hot. O.K. on Expl. motor under extra heavy load. Footer Text: R.R. 255a (500 2) (S.D. 438. 28-4-17.) Bm. 2156/13. | ||