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).
Specification sheet detailing the particulars of a starter motor, including dimensions and electrical data.
| Identifier | ExFiles\Box 64\1\ scan0201 | |
| Date | 23th February 1925 | |
| X8626 -18- Contd. Extract from Instruction Book Matter. 23-2-25 Starter Motor Particulars. Carcase. Diameter 6.000" Length 5.175 Thickness .325 Armature. Diameter 3.600 Active length 2.250 Length of overhang at driving end. 1.100 Length of comm. conns. excluding comm. spokes. 1.150 Ditto. including comm. spokes. 1.400 Weights. Complete machine with sprocket but without suspension.--- 30 lbs. Complete armature without sprocket.-- 10 lbs. Air gap. .025" - .63 mm. Field Circuit. No. of wound poles 4 Size of conductors .250 x.116 No. of turns per coil 8.75 Arrgt. of coils - all in series. Resistance of field circuit at 180C .0085 ohm. Contd. | ||