Design specifications for 'Goshawk I' and 'II' dynamos and motors, as well as the 40 HP chassis.
| Identifier | Morton\M16\ img030 | |
| Date | 9th June 1921 | |
| X.543 X4342 X.294 X4359 RE R.R. DYNAMOS AND MOTORS - "GOSHAWK(Aero Engine)(Codename for 20HP Car / Aero Engine after Kestrel(Aero Engine)) I" AND II" AND 40 HP. CHASSIS. We have sent you under cover of our memo E1/G9/6/21, drawing Lec.1405 which gives the proportions for the complete range of dynamos and motors of R.R. design for large and small chassis - future programme. This drawing also gives detail particulars of "Goshawk(Aero Engine)(Codename for 20HP Car / Aero Engine after Kestrel(Aero Engine)) II" motor and dynamo. One winding only now is required for the armature for the latter, namely, - 29 sections, 8 turns per section, .040" wire (18 S.W.G.) Also, as stated in a recent telegram, Mr. Royce thinks that we should not bother with anything different for "Goshawk(Aero Engine)(Codename for 20HP Car / Aero Engine after Kestrel(Aero Engine))" but should apply the "Goshawk(Aero Engine)(Codename for 20HP Car / Aero Engine after Kestrel(Aero Engine)) II" dynamo and motor to "Goshawk(Aero Engine)(Codename for 20HP Car / Aero Engine after Kestrel(Aero Engine))". There will be, as you know, a different ratio for the starter motor, and perhaps you will see what is required to accommodate this. We hope to receive from you in due course, the result of the calculations of the electrical quantities for the "Goshawk(Aero Engine)(Codename for 20HP Car / Aero Engine after Kestrel(Aero Engine)) II" machines, and drawings shewing the space required for the field windings, and also shewing the final details of the armature windings, so as to enable us to complete the designs of these machines. E. {Mr Elliott - Chief Engineer} EFC {E. Fowler Clarke - Electrical Engineer} JUN 14 1921 RECEIVED. | ||
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).