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).
Instructions detailing reduction gear specifications, gear ratios, and light test results.
| Identifier | ExFiles\Box 64\1\ scan0234 | |
| Date | 29th June 1920 | |
| RR 238 (150 BKS.) (SH57.29-6-20.) MP 224358 ROLLS-ROYCE LTD. INSTRUCTIONS. To Order No. PC.108 (2) Customer's No. Reduction gear:- No of teeth on motor sun pinion . 31 " " " " annulus. 65 " " " " planet wheels. 17 " " " " driving pinion. 18 " " " " engine rack. 130. giving :- Epicyclic gear. 96 to 31 = 3.097 to 1 Motor pinion to flywheel. 65 to 9 = 7.222 to 1 Total reduction. 22.37 to 1. Light Test. Teazer. { Speed on 12 volts. 500 rpm { Speed on 20 amperes. 500 rpm. Main. { Speed on 6 volts. 1405 rpm { Amperes on 6 volts. 26.2 Signed cont'd.{John DeLooze - Company Secretary} This Sheet must be filed on completion of the work. | ||