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).
Secret memo detailing a modification for the No.3 Spectre silencer to increase its flow area.
| Identifier | ExFiles\Box 93\1\ scan0023 | |
| Date | 12th July 1935 | |
| X323 H.Wyman. Please follow up. Rm{William Robotham - Chief Engineer} To BY.{R.W. Bailey - Chief Engineer} from E/JNR.{Charles L. Jenner} E/JNR.{Charles L. Jenner}1/HP.12.7.35. c. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} RHC.{R. H. Coverley - Production Engineer} SECRET. SpectreCodename for Phantom III Silencer We are told that No.3. SpectreCodename for Phantom III silencer may not be sufficiently free. We send you herewith LeC.4610 showing a modification which can be tried. We have removed altogether the baffle which is on the end of the ejector snout and replaced it by another which supports the central pipe on its outside. By doing this we have increased the flow area by 2 1/2 times. Drawing to BY.{R.W. Bailey - Chief Engineer} Print to Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} E/JNR.{Charles L. Jenner} Instructed for all SpectreCodename for Phantom III cars. Gaw | ||