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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).
Braking system analysis showing the effects of servo torque on front and rear brake distribution via a lever diagram, data table, and performance chart.

Identifier  ExFiles\Box 5\3\  03-page172
Date  29th October 1936
  
INDIA
M64/LG 20325 AS MODIFIED BY N. SCH. 2005 & DA{Bernard Day - Chassis Design} / M.8625

[Diagram of Brake Levers and Components with dimensions]
DRUM DIA 13"
.5 CAM
DRUM DIA 14"
.43 CAM

DIRECT REAR BRAKING
13/4.35, 1.187/1.350, 2.000/3.150, 6/2.3, 2.5/1.43, 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 218 P = 249 S.P.

SERVO FRONT BRAKING
S 13.1/4.35, 1.187/1.350, 1.850/1.750, 4.875/8.00, 2.15/2 x 167 = 307 S.P.

DISTRIBUTION FOR VARIOUS SERVO EFFICIENCIES
Table:
SERVO TORQUE MULTIPLR | 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 | 76.8 | 494 | 15.6 | 84.4
.5 | 355 | 124 | 479 | 154 | 633 | 24.3 | 75.7
.75 | 355 | 187 | 542 | 230 | 772 | 29.7 | 70.3
1 | 355 | 249 | 604 | 307 | 911 | 33.7 | 66.3
2 | 355 | 498 | 853 | 614 | 1467 | 41.8 | 58.2
3 | 355 | 747 | 1102 | 921 | 2023 | 45.4 | 54.6
4 | 355 | 996 | 1351 | 1228 | 2679 | 47.8 | 52.2

[Chart Title Area]
TO APPLY OUTPUT FIGURES OBTAINED BY SPRING BALANCE TO THIS CHART (REF)
MULTIPLY THEM BY 1.55 - 1.6? OUTPUT .15. GENL. TORQUE MULTIPLICATION .77.
% FRONT BRAKING 60% WITH [illegible]
INDIA
ORIGINAL BRAKE LEVERS AS IN M64/LG20325
ALTERED AS PER N.SCH.2005 & DA{Bernard Day - Chassis Design}/M8625

[Chart Area]
Vertical Axis (Left): CONVENTIONAL BRAKING UNITS (0-2200)
Vertical Axis (Right): % BRAKING (0-100)
Horizontal Axis: SERVO TORQUE MULTIPLR UNITS (0-4)
Chart Lines: TOTAL BRAKING, % REAR BRAKING, TOTAL REAR BRAKING, % FRONT BRAKING, SERVO TO FRONT, SERVO TO REAR

[Stamp in bottom right corner]
ROLLS-ROYCE LIMITED
MAIN PRINT ROOM
29.10.36
DERBY
  
  


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