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).
Requesting a comparative trial for a starter epicyclic gear with alternative threads and a specific helix angle.
| Identifier | ExFiles\Box 68\3\ scan0165 | |
| Date | 28th January 1925 | |
| X.8640 C. EFC. BY/RD4/ML.28. 1. 25. X.8640 - STARTER.EPICYCLIC GEAR - E.A.C.11. In accordance with EFC1/T14. 1. 25., requesting us to put alternative threads in hand, will you please receive herewith one blueprint of D.70929 - Pinion and D.70930 - Shaft having a thread, the Helix angle of which is 55°- 8'. Will you please put this in hand for compartive trial. BY/RD. | ||