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).
Weight correction and specifications for the X.4359L Lucas E.5RR Dynamo for the 'Goshawk II'.
| Identifier | WestWitteringFiles\G\October1921\ Scan7 | |
| Date | 7th October 1921 | |
| R.R. 235a (100 T) (S.H. 798. 10-12-20) G 2947 To R & E.{Mr Elliott - Chief Engineer} from EFC. c. to AJ & FN. c. to Rg.{Mr Rowledge} & Da.{Bernard Day - Chassis Design} c. to Ry. & EP.{G. Eric Platford - Chief Quality Engineer} c. to R.H. of America Inc. ORIGINAL X.4359L- LUCAS E.5RR DYNAMO FOR "GOSHAWK II". It appears that an error occurred in the weight of this machine so that the weight was given as 24 lbs 8 ozs., - the actual weight we now find to be 26 lbs. This is the complete machine with pulley, but without suspension and of course, as in all the other cases, includes the additional weight of the special bearing plate which has been arranged for this machine. Further particulars of this dynamo not given in our previous report EFC1/T30.9.21 are as follows :- Air gap - .015" Field circuit resistance 15.9 ohms at 18°C Control winding resistance .25 ohm at 18°C. (It will be seen from this that, as explained previously, the field winding is relatively of less importance than in the case of the E.575) No. of armature slots - 29. No. of coils or comm: bars 29. Armature resistance at 18°C - .447 ohm. Commutator diameter - 1.825". Useful length - 1.125". Brush contact area .9" x .205" = .202 sq." Brush material - E.C.C. Morganite, as recently recommended for the E.575 machine by the Lucas Co. The arrangement of brushes is such that the control brush is practically virtually mid-way between the main positive and negative brushes on the commutator. Armature active length - 3.30" Overhang of armature conductors at driving end 1.10" Overhang of connections at commutator end, exclusive of commutator spokes - 1.35". The system of control of this machine as arranged (the standard Lucas system) necessitates four | ||