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 engine units B.III and Wraith III, focusing on valve bounce and torsional oscillation.
| Identifier | ExFiles\Box 155\2\ scan0210 | |
| Date | 27th April 1938 | |
| 1315 To Rm.{William Robotham - Chief Engineer} from Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} c.c. Rm{William Robotham - Chief Engineer}/Mths.{Reg Matthews} c.c. Rm{William Robotham - Chief Engineer}/GTS. Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}2/MH.{M. Huckerby}27.4.38. PROGRAMME OF TEST BED WORK. Further to Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}1/MH.{M. Huckerby}28.3.38. No. 30 BED. B.III NO.1 Unit (a bed). On completion of previous timing and induction system tests, strip to examine little end bushes. These are semi-floating type and information required for production. Re-assemble and continue investigation of valve bounce with Rotorscope or Stroboscope. (a) Bounce speed under existing conditions, record all valves. (b) What length are valve springs and corresponding load in valve close position. (c) Do valves bounce on opening or closing ? (d) Increase grummet thickness for experiment until the spring is just clear of being choc-a-bloc, check valve spring load and length in closed position, also bounce speed. (e) Check springs for surge over speed range. (f) Trial of Rs.{Sir Henry Royce's Secretary}540 springs for bounce and surge. WRAITH III NO.1 UNIT. This unit which is very important and should replace B.III No.1 unit to carry out torsional oscillation tests as follows. Full throttle and lightest load diagrams required from 500 R.P.M. - 4500 R.P.M. | ||