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 Wraith III engines No. 6 and No. 2, detailing endurance runs and modification tests.
| Identifier | ExFiles\Box 155\2\ scan0161 | |
| Date | 8th October 1937 | |
| To RM.{William Robotham - Chief Engineer} from Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} c. RM{William Robotham - Chief Engineer}/Mths.{Reg Matthews} c. RM{William Robotham - Chief Engineer}/CTS.{C. Trot Salt - Carburation} c. RM{William Robotham - Chief Engineer}/Ed.{J. L. Edwards} Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}4/M.H.8.10.37. [Handwritten]: 1313 PROGRAMME OF TEST BED WORK. FURTHER to our memo Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}12/WH.30.9.37. No. 30 Bed. Wraith III. No.6 Continue with test as previous memo since modifying rear main bearing to Rm.{William Robotham - Chief Engineer}458 to prevent oil leak into clutch pit. Wraith III. No.2 Unit to be fitted on second Wraith bed for endurance. The object of this run is to try and reproduce the exhaust valve failure in France on 26-G-VI. New tappet guide bushes have been fitted in 3 materials, A/P, RR.50, and I/C. Unit will require running in on P.4, 10% hard oil mixture then, and when complete change over to Duckham's NP.3 oil for endurance run. Before commencing endurance take open exhaust power curve. Running to be carried out on Ethyl fuel with a careful record of tappet clearances kept. Each 1 hour to to comprise of - 40 mins. at 4000 R.P.M. 18 mins. at 4200 R.P.M. 2 mins. at 4400 R.P.M. | ||