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).
Chart and table detailing brake system distribution and efficiencies for various servo torque multiplications.
| Identifier | WestWitteringFiles\M\2April1925-June1925\ Scan128 | |
| Date | 12th June 1925 | |
| INDIA HS{Lord Ernest Hives - Chair}4 / LG 20525 AS MODIFIED BY N.SCH. 2005 & DAI / M 9625 DIAGRAM DATA: 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" 3.150 6.00 DRUM DIA. 14" .43 CAM 2.50 2.30 CALCULATIONS: DIRECT REAR BRAKING: 13/4.35 x 1.187/1.350 x 2.000/3.150 x 6/2.3 x 14P/1 x 2.5/.43 = 355 P. SERVO REAR BRAKING: S 13/4.35 x 1.187/1.350 x 1.850/1.750 x 4.875/8.000 x 2.150/3.150 x 213P = 249 S.P. SERVO FRONT BRAKING: S 13/4.35 x 1.187/1.350 x 1.850/1.750 x 4.875/8.00 x 2.15/2 x 145P = 266 S.P. TABLE: DISTRIBUTION FOR VARIOUS SERVO EFFICIENCIES. Columns: SERVO TORQUE MULTIPLN, FOOT RATIO TO REAR, SERVO TO REAR, TOTAL TO REAR, SERVO TO FRONT, TOTAL BRAKING, % BRAKING FRONT, % BRAKING REAR. - Row 1: 0, 355 P, 0, 335, 0, 335, 0, 100% - Row 2: .25, 355, 62.3, 417, 66.5, 483, 13.7, 86.3 - Row 3: .5, 355, 124, 479, 133, 612, 21.6, 78.4 - Row 4: .75, 355, 187, 542, 199, 741, 26.8, 73.2 - Row 5: 1, 355, 249, 604, 266, 870, 30.6, 69.4 - Row 6: 2, 355, 498, 853, 532, 1385, 38.5, 61.5 - Row 7: 3, 355, 747, 1102, 798, 1900, 42, 58 - Row 8: 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/M9625. Left Y-Axis: CONVENTIONAL BRAKING UNITS (0-2000) Right Y-Axis: % BRAKING (0-100) X-Axis: SERVO TORQUE MULTIPLN UNITS (0-4) Graph Lines: TOTAL BRAKING, % REAR BRAKING, TOTAL REAR BRAKING, % FRONT BRAKING, SERVO TO FRONT, SERVO TO REAR. STAMP: ROLLS-ROYCE LTD. PRINT ROOM 12 JUN 1925 DERBY | ||