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).
Reports on Wraith starting experiments, coil casing materials, and plug gaps.
| Identifier | ExFiles\Box 151\3\ scan0360 | |
| Date | 4th February 1938 | |
| To By. {R.W. Bailey - Chief Engineer} from Rm. {William Robotham - Chief Engineer} c. Hs. {Lord Ernest Hives - Chair} c. RHC. {R. H. Coverley - Production Engineer} c. Da. {Bernard Day - Chassis Design} c. Mx. {John H Maddocks - Chief Proving Officer} 1290 also R.C. Rm {William Robotham - Chief Engineer} 16/R.4.2.38. WRAITH COILS & BATTERIES. Attached are some reports on Wraith starting experiments. Our target is that we must be no worse than the present 25/30. The .030 plug gaps have necessitated a better coil. The plug gaps are well worth fighting for as they give such a marked improvement in idling and slow speed pulling. We believe that the metal casing used on these high output coils are likely to be better than Bakelite casings from a cooling point of view. In other words, that we handicap ourselves from an efficiency point of view by making the coils look nice. Rm. {William Robotham - Chief Engineer} | ||