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).
Specifications for the 6-volt electrical system of the S.S. Phantom II.
| Identifier | ExFiles\Box 61\2\ scan0262 | |
| Date | 7th May 1929 | |
| X 3374 7.5.29. 6-VOLT ELECTRICAL SYSTEM FOR S.S. (PHANTOM II) BATTERY. Three cell battery of ampere-hour capacity 130. AMMETER. Range 30-0-30 amperes. IGNITION. Ballast:- Old standard single. Coil:- 210 turns in four layers of No. 19 SWG. D.S.C. resistance .34 ohm. Inductance .005 henry. 18000 turn secondary. Condenser:- Maximum capacity in space available. DYNAMO. Present (inverted) S.S. machine (normal output) has Field winding of 19 S.W.G. (.040) Armature " of 18 S.W.G. (.048) Proposed intermediate output machine (24 slots) has Field winding of 19 S.W.G. (.040) Armature " " 17 S.W.G. (.056) For half voltage, nearly double current we want Field winding of 17 S.W.G. (.056) Armature " " 18 S.W.G. (.048) duplex wave wound. Contd. | ||