Diagram of brake linkages and leverage calculations for the Wraith II model.
| Identifier | ExFiles\Box 7\7\ X 606 Brakes-page030 | |
| Date | 29th January 1936 | |
| N. SCH. 4916 TO CENTRE OF PEDAL PLATE LEVERAGES FOOT - DIRECT TO REAR = P x 13.250/4.750 x 1.750/2.750 x 2.125/2.125 x 3.500/2.500 x 2.500/1.750 x 2.125/3.400 x 6.000/4.125 = .267 P FOOT - SERVO TO REAR = P x 13.250/4.750 x 1.750/2.750 x 2.125/1.600 x S/T x 4.250/6.250 x 2.500/2.750 x 2.300/1.750 x 6.000/3.416 = .16 P. x S. FOOT - SERVO TO FRONT = P x 13.250/4.750 x 1.750/2.750 x 2.125/1.600 x S/T x 4.250/6.250 x 1.950/1.625 x 1.625/1.562 x 3.000/1.350 x 3.250/3.15 = .234 P. x S. SERVO MULTIPLICATION OF TORQUE = (2.125 / .475) x (2.125 / .75) = 27 TOTAL REAR = .267 + [ .16 x 27] = 69.9 P TOTAL FRONT = .234 x 27 = 63.2 P TOTAL BRAKES 133.1 P CORRECTED (SERVO IMBALANCE) :- SERVO TO REAR = .16 x 27 x 588/768 = 32.7 DIRECT TO REAR = .267 (Total) 69.4 SERVO TO FRONT = .234 x 27 x 148/768 = 63.75 RATIO FRONT/REAR = 1.065 LEVERAGE HAND BRAKE TO REAR = P x 18.000/2.500 x 2.000/2.750 x 2.300/1.750 x 2.300/3.400 x 6.000/4.125 = 70.5 P SCALE - NONE DIAGRAM OF BRAKE LEVERAGES -- WRAITH II OTR 29/1/36 N. Sch. 4916 | ||
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).