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).
Dynamo and motor designs for the Goshawk I experimental chassis, comparing specifications with the Goshawk II.
| Identifier | ExFiles\Box 39\2\ Scan076 | |
| Date | 31th August 1922 | |
| X3533 To E.{Mr Elliott - Chief Engineer} from EFC. c. to Ry. EFC1/T31.8.22. X.3533/4 - GOSHAWK I DYNAMO AND MOTOR We understand it is intended to complete for Goshawk I expl. chassis, the designs of dynamo and motor given on Lec.1073 and Lec.1214 respectively, this latter giving a 14.2 reduction ratio of motor to engine. It is understood that more particularly the mechanical design is required, and the question has arisen as to whether Mr. Royce intends the electrical design of dynamo and motor to be completed as originally arranged, or whether he intends the present electrical design of dynamo and motor for Goshawk II to be adapted. The dynamo carcase diameter on Lec.1073 is 5.250", whereas the Goshawk II dynamo is 5.000". We have some calculations of windings for the dynamo based on the armature dia. as shown on Lec.1073 of 2.750", but we have record that in showing the results of these calculations to R.{Sir Henry Royce} during one of our visits, he did not consider the design was suitable or that the machine would do in the form already instructed. He came to the conclusion (as we had previously considered) that the armature dia. was too small and should be put up to 3.250", which would make this dynamo only slightly larger, both in the armature and carcase, than our present Goshawk II dynamo, and it is queried whether R.{Sir Henry Royce} intends to have the two machines so nearly alike, as we should undoubtedly make the number of armature slots the same, viz. 29, and use an | ||