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).
Schematic of modified brake levers with a corresponding chart analyzing braking distribution and efficiency versus servo torque.
| Identifier | ExFiles\Box 57\1\ Scan155 | |
| Date | 15th June 1925 guessed | |
| INDIA HS{Lord Ernest Hives - Chair}4/LG 20525 AS MODIFIED BY N.SCH 2005 & DAI/M 9625 DIAGRAM: DRUM DIA. 13 .5 CAM DRUM DIA. 14 .43 CAM 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) x (2.150/3.150) x 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) x 145 P = 266 S.P. TABLE: DISTRIBUTION FOR VARIOUS SERVO EFFICIENCIES. | 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 | 335 | 0 | 335 | 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 | GRAPH: TITLE: INDIA ORIGINAL BRAKE LEVERS AS IN HS{Lord Ernest Hives - Chair}4/LG20525, ALTERED AS PER N.SCH 2005 & DAI/M 9625. LEFT Y-AXIS: CONVENTIONAL BRAKING UNITS. RIGHT Y-AXIS: % BRAKING. X-AXIS: SERVO TORQUE MULTIPLN UNITS. LINES: TOTAL BRAKING, % REAR BRAKING, TOTAL REAR BRAKING, % FRONT BRAKING, SERVO TO FRONT, SERVO TO REAR. | ||