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).
Motor armature diameter and a proposed test using a 20 HP armature.
| Identifier | WestWitteringFiles\Q\2April1927-June1927\ 126 | |
| Date | 24th May 1927 guessed | |
| -2- Contd. Therefore it appears to us that our armature diameter for this motor should be about the same as that for the 20 HP., viz. 2.850, giving a ratio of .57, which suggests that a 20 HP. armature might be tried in the sequence motor carcase. EFC. | ||