Secret document detailing the numerical particulars and performance specifications of an E.A.C. Dynamo.
| Identifier | WestWitteringFiles\L\2Jan1924-March1924\ Scan69 | |
| Date | 3rd March 1924 | |
| ORIGINAL SECRET To R. {Sir Henry Royce} from EFC. {E. Fowler Clarke - Electrical Engineer} c. CJ. & PN. {Mr Northey} c. E. {Mr Elliott - Chief Engineer} Da. {Bernard Day - Chassis Design} c. Hy. {Tom Haldenby - Plant Engineer} EP. {G. Eric Platford - Chief Quality Engineer} EFC {E. Fowler Clarke - Electrical Engineer} 1/T13.3.24. E. {Mr Elliott - Chief Engineer} A. {Mr Adams} C. X.9660 - E.A.C. DYNAMO OUTPUT PERFORMANCE. For convenience of reference we first give the numerical particulars of this machine, as follows :- Carcase. Diameter 5.50" Length 5.85" Thickness .312" Armature. Diameter 3.50" Active length 3.30" Length of overhang at driving end 1.075" Length of comm.connections, excluding comm. spokes 1.425" Ditto, including comm. spokes .... 1.60" Weights. Complete machine with pulley but without suspension.... 31 lbs. Complete armature, without pulley............ 11.2 lbs. Air Gap ..... .015" = .38 mm. Field Circuit. Number of wound poles ... 4 Dia. of wire .... .040" (19SWG) No. of turns per coil 170 Arrgt. of coils.... all in series. Resistance of field circuit:- at 18°C 4.1 ohms. at 100°C 5.4 ohms. Contd. | ||
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).