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).
Line diagram of a servo fitting, showing two schemes with force calculations.
| Identifier | ExFiles\Box 152\2\ scan0258 | |
| Date | 26th July 1937 | |
| MODIFICATIONS. No. DATE THIS DRAWING NOT TO BE SCALED. IF IN DOUBT ASK. SCHEME I. PEDAL ROD 5/8" BRAKE ROD 27/32" 3 3/4" R.{Sir Henry Royce} PISTON ROD. ENLARGED VIEW OF SERVO LEVER. PEDAL RATIO = 3 to 1. .075 LBS. 150 LBS. TO STRUCTURE. RESERVOIR. NON-RETURN VALVE. 1.25" M/M BORE SERVO. 1.5/1 LEVER RATIO WITH PROVISION FOR A 10% INCREASE OR REDUCTION. RETARDING FORCE WITH 75 LBS. ON PEDAL = 1830 LBS. RETARDING FORCE WITH 150 LBS. ON PEDAL = 2440 LBS. SCHEME II 3.39/1 PEDAL RATIO. 1 7/16" RAD PIN END RETARDING FORCE WITH 75 LBS. ON PEDAL = 1275 LBS. RETARDING FORCE WITH 150 LBS. ON PEDAL = 1275 LBS. USED ON TYPE FINISHED DIMENSIONS GIVEN. MACHINE WHERE INDICATED. ALL LIMITS TO NEWALL STANDARD. MACHINING DIMENSIONS NOT LIMITED. TO BE ± .007" ± .2 M/M.{Mr Moon / Mr Moore} ⊕ MACHINE ALL OVER. G.{Mr Griffiths - Chief Accountant / Mr Gnapp} GROUND FINISH. ≠ FINE MACHINE FINISH. ⊗ STAMPING FINISH. F ORDINARY MACHINE FINISH. DRAWN: A.S.P. 26.7.37 TRACED CHECKED PASSED CLAYTON DEWANDRE CO LTD LINCOLN. ROLLS-ROYCE. LTD. LINE DIAGRAM OF SERVO FITTING SCALE WEIGHT ROUGH FINISHED No. PER SET MATERIAL MADE FROM CAN BE MADE FROM ISSUED PART NO SK.2781. STAMP: CLAYTON DEWANDRE CO. LTD. DRAWING OFFICE 27 JUL 1937 | ||