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).
Correcting the reduction ratios for the EAC starter motor, pinion to flywheel, and the total ratio.
| Identifier | ExFiles\Box 64\3\ scan0076 | |
| Date | 17th July 1926 | |
| X7650 To BY/RD. from EFC. EFCl/T17.7.26. For the two reduction ratios of the EAC. starter motor to pinion, and pinion to flywheel respectively, you have given us the figures 3.09 and 7.204, and I understand these were taken from your prints. The correct figures are 3.097 and 7.222 if taken to four significant figures, and 3.10 and 7.22 if taken to three ditto. The total ratio is 22.37 if taken to four figures, whereas the figure you gave is 22.26. EFC. | ||