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).
Programme of test bed work for a Wraith III No.1 Unit, detailing various endurance and performance trials.
| Identifier | ExFiles\Box 155\2\ scan0099 | |
| Date | 15th June 1937 | |
| To Rm.{William Robotham - Chief Engineer} from Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} c. to Rm{William Robotham - Chief Engineer}/Mths.{Reg Matthews} c. to Rm{William Robotham - Chief Engineer}/GTS. c. to Rm{William Robotham - Chief Engineer}/Ed.{J. L. Edwards} 131- PROGRAMME OF TEST BED WORK. Further to Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}12/JH.8.6.37 No.30 Bed. Wraith III. No.1. Unit. (1) 2 hours running in trial 500 - 1000 R.P.M. on Hi-press oil with existing cleaned up tappets and chrome plated tappets. Removal and inspection after above. (2) During the above 2 hours try to determine which valves are noisy and which quiet. (3) check valve lift diagram on quiet valve also noisy valve. (4) Drain off Hi-press oil and refill with standard oil. (5) Extra keyway has been cut in camshaft to enable 6° variation of timing. Power curves open exhaust and with std. 30.HP. silencer at 3 timings i.e. 6° early, normal and 6° late. During high speed running check actual speed at which valves start to bounce. (6) By the time the above are complete the Chevrolet type of tappets will be ready for trial. New camshaft to be fitted in conjunction with new tappets. B.19 Continue endurance up to 50 hours duration i.e. 25 hours full throttle and 25 hours ¼ load. Unit to be then removed and returned to Shpp for Inspection B.24. This unit to follow B.19 on the bed. Has been finally assembled for 15,000 miles test. New parts include:- continued | ||