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).
Instructions and modifications for Wraith brake settings and lever positions.
| Identifier | ExFiles\Box 108\1\ scan0364 | |
| Date | 18th February 1938 | |
| 606 600a To Rm{William Robotham - Chief Engineer}/IMW.{Ivan M. Waller - Head of Chateauroux} (Chateauroux) from Rm{William Robotham - Chief Engineer}/AFM.{Anthony F. Martindale} Rm{William Robotham - Chief Engineer}/AFM.{Anthony F. Martindale}10/AP.18.2.38 WRAITH BRAKES. We understand from Rm.{William Robotham - Chief Engineer} that you are not satisfied with the Wraith brake setting. We enclose a print which has marked on it the length of all the rods, and a modified sheet of setting instructions. As regards the angular position of the various levers, these are fixed as follows:- The pedal plate should be 9" from the dash, measured from the upper back edge of pedal plate. The angular position of the levers L1 and L2 is fixed by the stop Q. The angular position of the idler lever L3 and the rear equalizer is fixed by the stop on the former. The angular position of the bell cranks D1 and D2 is given in para (e) of the setting instructions. The angular position of the shafts D3 and D4 is fixed by the ropes R1 and R2, which are not adjustable: this angular position is not critical. The angular position of the levers on the servo counter-shaft can be taken as fixed by setting the rod A2 to the length shown and adjusting on the rod A1. We have not quite finished dealing with the front brakes but the rod lengths shown may be taken as sufficient guide. The floorboard cross rail above the pedal may have to be cut away. We are instructing this in future. The hole in the frame cruciform may have to be enlarged to clear the rod B1. We are arranging for this in future. The heads of the pinch bolts in the levers on the servo countershaft should be to the rear, to give maximum clearance; a modification is instructed here. As regards O.B.1V., Rm.{William Robotham - Chief Engineer} has reported on this and on his instructions we are investigating your complaints further, when we will write you. Rm{William Robotham - Chief Engineer}/AFM.{Anthony F. Martindale} | ||