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).
Page with calculations and specifications for electrical component slots and windings.
| Identifier | ExFiles\Box 68\4\ scan0255 | |
| Date | 30th March 1928 guessed | |
| -5- Contd. This is too small compared with previous neck of .102" Hence we adopt 26 slots each .186 by .536. Cce at neck = 7.67" 1/26 of this = .295" Slot = .186" Neck = .109" which is slightly better than before. As before (20 H.P. case) 24 slots give a number of conductors less than 2/3 of the standard number, viz. 288 against 456, 26 slots give 312 which is 312/456 = .684 of old number. This will be O.K. owing to other improvements, space factor, neck etc. It is proposed in first instance to try a retro.equi. conductor-pitch winding of step 6 (1 to 7). This will have no degree of short chording. EFC. | ||