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).
Calculation sheet for a four-pole dynamo for the 'Goshawk' project, part I.
| Identifier | ExFiles\Box 39\2\ Scan030 | |
| Date | 6th December 1920 | |
| X. 3533 1. 6.12.20. FOUR-POLE DYNAMO FOR "GOSHAWK". I. Cold cutting in 10 m.p.h., i.e. 667 r.p.m. of dynamo. We must have 12.4 volts at 667 r.p.m; if we allow 2.0 volts for field current in armature E must be 14.4. Flux per pole at 67,500 lines per square inch = 135,000 lines. = (60 x 10^8 x b x E) / (Φ N P) Z = (60 x 10^8 x 2 x 14.4) / (135,000 x 667 x 4) = 480 | ||