Programme of test bed work for the Wraith Ripple No.2 Unit engine.
| Identifier | ExFiles\Box 155\2\ scan0320 | |
| Date | 16th May 1939 | |
| 1815 To Rm. {William Robotham - Chief Engineer} from Rm {William Robotham - Chief Engineer} /Swdl. {Len H. Swindell} c. Rm {William Robotham - Chief Engineer} /CTS. {C. Trot Salt - Carburation} Rm {William Robotham - Chief Engineer} /Swdl. {Len H. Swindell} 5/MH. {M. Huckerby} 16.5.39. PROGRAMME OF TEST BED WORK. Further to our memo Rm {William Robotham - Chief Engineer} /Swdl. {Len H. Swindell} 3/MH. {M. Huckerby} 8.5.39. NO.30 BED. WRAITH RIPPLE No.2 UNIT. 3¼ BORE UNIT. (a) At present has flat topped pistons 5.3 : 1 Comp. ratio. (b) Raised crown pistons to be fitted as soon as available which will give 7.0 : 1 Comp. ratio. Until (b) have arrived carry out following after running in:- (1) Power curve open exhaust. (2) Gears to be made a good job in respect of rattle, light and under load, also for whine. (3) Unit generally to be quiet in all respects. With correct pistons check:- (1) Open exhaust power curve, also with standard Wraith III system. (2) Take curves on Redline with Wraith III exhaust system, (a) Min. advance for max. power. (b) Non detonating line. (3) Oil consumption at 4000 r.p.m. over 1 hr., repeat if in excess of 2 pts/hr. (4) Take open exhaust compression pressures. | ||
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).