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).
Comparison of four different starter motors and their performance characteristics.
| Identifier | WestWitteringFiles\T\November1928\ Scan041 | |
| Date | 20th November 1928 guessed | |
| -2- Contd. The four machines for which the results are given are as follows :- (1) The R.R. standard 6" dia. motor with 90 armature conductors. (2) One of the No.1 type 5" dia. sequence starter motors (G2) having 82 conductors. (3) Sequence starter motor K.{Mr Kilner} The first of the 2B. type with 90 conductors and an armature taper of 3.100 to 2.900". (4) The pre-War R.{Sir Henry Royce} Bosch S45, 5.9" dia. motor with 82 conductors. Comparison of the curves shows the relative degree of saturation obtained in the case of each motor up to a current of 220 amperes. The table shows the lb-inches of conductor torque of each motor at 120 amperes of current and the corresponding number of kilolines of flux calculated as described. We have not had an opportunity of taking similar data for the J motor on chassis 14-EX, though possibly this may be fairly represented by the figures and curves given for the G2 motor. Similar data for further motors will be obtained as occasion arises. EFC. | ||