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).
Starter motor particulars, including pinion thread angles and specifications.
| Identifier | ExFiles\Box 64\3\ scan0080 | |
| Date | 15th August 1926 | |
| To EFC. X7650 15.8.26. STARTER MOTOR PARTICULARS. X.8620/50. X.7650/20. The two S. motor pinion thread angles are 55º 8' helix. (34º 52' spiral) 45º helic. (45º spiral) The angle of the pinion thread on S. motor G.2 is 55º8' helix. C motor differs from standard in the following respects :- It has not the poles with the reduced cores. The teazer winding has only 33 turns per pole. It requires the new epicyclic reduction gear together with the pinion fitted with flanges. C.A.P. | ||