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).
Blueprint graph detailing the braking performance and servo multiplication of torque for a 3½ Litre Bentley.
| Identifier | ExFiles\Box 84\2\ scan0047 | |
| Date | 12th July 1932 | |
| 12 7 32 Hs{Lord Ernest Hives - Chair} 1069 3½ LITRE BENTLEY 14⅛ DIA. FRONT DRUMS 12⅛ DIA. REAR DRUMS DIRECT RATIO .23 : 1 SERVO TO FRONT AND REAR 9 : 1 NO MOVEMENT OF SWINGING ARM BRAKE UNITS - PEDAL TO CAM x DRUM DIA % BRAKING SERVO MULTIPLICATION OF TORQUE TOTAL BRAKING S=.23 % FRONT BRAKING TOTAL TO REAR SERVO TO FRONT SERVO TO REAR TO NSCH 3570 444 4.125 1.875 1.625 NEW 1.565 1.750 ALL OTHER LEVERS EXISTING TO L.E.C. 3408 13.350 4.500 1.187 1.850 6⅛" 4.875 NEW 1.750 1.45 1.8 2.710 3.4 FOR .375 LININGS 2.500 3.3 444 2.750 5.750 | ||