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).
Diagram and chart analyzing a modified braking system's efficiency and distribution.
| Identifier | ExFiles\Box 105\4\ scan0015 | |
| Date | 17th June 1925 guessed | |
| INDIA MS4 / LG 20525 AS MODIFIED BY N.SCH. 2005 & DAI / M 9625 DIAGRAM TEXT & VALUES: DRUM DIA. 13" .5 CAM 3.35 2.25 1.35 13.0° 4.35 1.187 1.350 2.00 2.150 4.00 4.875 1.850 2.150 2.00" 3.150 6.00 DRUM DIA. 14" .43 CAM 2.50 2.30" BRAKING CALCULATIONS: DIRECT REAR BRAKING 13 / 4.35 = 1.187 / 1.350 * 2.000 / 3.150 * 6 / 2.3 * 2.5 / 43 = 14 P. = 355 P. SERVO REAR BRAKING S * 13 / 4.35 = 1.187 / 1.350 * 1.850 / 1.750 * 4.875 / 8.000 * 2.150 / 3.150 * 213 P = 249 S.P. SERVO FRONT BRAKING S * 13 / 4.35 = 1.187 / 1.350 * 1.850 / 1.750 * 4.875 / 8.00 * 2.15 / 2 * 145 P = 266 S.P. DISTRIBUTION FOR VARIOUS SERVO EFFICIENCIES. TABLE: SERVO TORQUE MULTIPLN | FOOT RATIO TO REAR | SERVO TO REAR | TOTAL TO REAR | SERVO TO FRONT. | TOTAL BRAKING | % BRAKING FRONT | % BRAKING REAR. 0 | 355 P. | 0 | 355 | 0 | 355 | 0 | 100 % .25 | 355 | 62.3 | 417 | 66.5 | 483 | 13.7 | 86.3 .5 | 355 | 124 | 479 | 133 | 612 | 21.6 | 78.4 .75 | 355 | 187 | 542 | 199 | 741 | 26.8 | 73.2 1 | 355 | 249 | 604 | 266 | 870 | 30.6 | 69.4 2 | 355 | 498 | 853 | 532 | 1385 | 38.5 | 61.5 3 | 355 | 747 | 1102 | 798 | 1900 | 42 | 58 4 | 355 | 996 | 1351 | 1064 | 2415 | 44 | 56 CHART TEXT: INDIA ORIGINAL BRAKE LEVERS AS IN MS4/LG 20525. ALTERED AS PER N.Sch. 2005 & DAI / M 9625. Y-AXIS (LEFT): CONVENTIONAL BRAKING UNITS. Y-AXIS (RIGHT): % BRAKING. X-AXIS: SERVO TORQUE MULTIPLN UNITS CHART LINES: TOTAL BRAKING % REAR BRAKING TOTAL REAR BRAKING % FRONT BRAKING SERVO TO FRONT SERVO TO REAR STAMP: ROLLS-ROYCE LIMITED DERBY | ||