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).
Two dynamo armatures with different speeds and outputs for the Phantom model.
| Identifier | ExFiles\Box 68\4\ scan0085 | |
| Date | 25th April 1928 | |
| EFC. from R.{Sir Henry Royce} c. BJ. Hs.{Lord Ernest Hives - Chair} BY.{R.W. Bailey - Chief Engineer} X8664 R5/M25.4.28. PHANTOM DYNAMO - 2 ARMATURES FOR DIFFERENT SPEED & OUTPUT: X.8664. Referring to your EFC2/T23.4.28, I am not very particular whether you have 26 or 28 slots so long as they are alike on both armatures. The armature would be 3 and 4 turns respectively. Also that both dynamos, whichever armature is used, should have a less rapid falling output with speed than at present, which appears to be overdone in this respect. R.{Sir Henry Royce} | ||