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).
Comparison table of specifications for various shunt dynamos.
| Identifier | ExFiles\Box 51\1\ Scan164 | |
| Date | 4th July 1923 | |
| X.294 SHUNT. DYNAMO TABLES Column Headers: ✓ X.294 C.A.V. AS SHUNT ✓ X.295 Smith S.G. AS SHUNT ✓ X.295A Smith S.G. AS SHUNT X.776 Bosch ✓ X.3306 LIBERTY ✓ X.3983 RR GOSHAWK AS SHUNT ✓ X.1005 ROTAX A {Mr Adams} /C PROJ. AT SHUNT ✓ X.9870 WESTINGHOUSE ✓ X.3765 SOUTHFIELD ✓ X.4290 R. {Sir Henry Royce} BOSCH 'JEEP' ✓ X.1000 R.R. 1974 DYNAMO WEIGHTS IN LBS - COMPLETE MACHINE WITH PULLEY BUT WITHOUT SUSPENSION: 36, 33.0, 33.6, 37.0, 11.7, 20.8, 27.0, 21.1, 30.7, 29.4, WITH SUSPENSION 27.4 - ARMATURE COMPLETE WITHOUT PULLEY: 9.5, 9.5, 9.9, 9.4, 3.0, 7.3, 11.5, 7.2, 10.6, 8.8, 10.125 - BARE WEIGHT OF CARCASE AND POLE PIECES: 16.25, —, 16.2, 16.25, 4.0, —, —, —, —, —, — - WEIGHT OF ARMATURE STAMPINGS: 4.25, —, 4.87, 5.37, 1.44, —, —, —, —, —, — - WEIGHT OF ARMATURE COPPER (EXCLUSIVE OF COMMUTATOR): —, —, 1.87, 1.7, .50, —, —, —, —, —, — - WEIGHT OF FIELD COPPER: 4.25, —, 3.43, 3.8, 1.06, —, —, —, —, —, — GAP - Mm.: .625, .81, .51, .23, .33, .38, .508, .508, .34, .90, .43, — - INCHES: .025, .032, .020, .009, .013, .015", .020, .020, .0135", .039, .017, .0125 FIELD CIRCUIT - NUMBER OF WOUND POLES: 2, 2, 2, 1, 4, 4, 4, 4, 4, 4, 4 - DIAMETER OF WIRE. NEAREST SWG. INSULATION: .041" 18 SWG D.C.C., —, .064" 16 SWG S.C.C., .064" 16 SWG DSC, .038" 20 SWG D.S.C., .040" 19 SWG D.C.C., .056" 17 SWG ENAM, .031" 21 SWG, —, .040" 19 SWG D.S.C., — - NUMBER OF TURNS PER COIL: 495, —, 285, 801, 145, 195, —, —, —, —, — - ARRANGEMENT OF COILS: IN SERIES, IN SERIES, IN SERIES, —, ALL IN SERIES, ALL IN SERIES, ALL IN SERIES, ALL IN SERIES, ALL IN SERIES, ALL SERIES, ALL SERIES - RESISTANCE OF FIELD CIRCUIT (COLD 18°C) (Ω): 5.2, 1.0, 1.3, 1.0 AT 22°C, 4.1 AT 20°C, 2.6, 1.81, 0.75, 10.7, 4.6, 6.0, 8.8 ARMATURE CIRCUIT - TYPE OF WINDING: PROG LAP, RETROG LAP, PROG LAP, RETROG LAP, RETROG WAVE, RETROG WAVE, RET WAVE, RETROG WAVE, RETROG WAVE, RETRO WAVE, RET WAVE - NUMBER OF SLOTS (S): 24, 19, 19, 12-21, 21, 29, 14, 17, 25, 15, 50 - NUMBER OF CONDUCTORS (N): 672, 760, 684, 480, 462, 464, 672, —, —, —, — - CONDUCTORS PER SLOT (N/S): 28, 40, 36, 40, 22, 16, 48, —, —, —, — - COILS PER SLOT (C/S): 2, 2, 2, 3, 1, 1, 2, 2, 1, 3, 2 - NUMBER OF COILS OR COM. BARS (C): 48, 38, 38, 36, 21, 29, 28, 33, 25, 45, 39, 49 - TURNS PER COIL (N/2C): 7, 10, 9, 6.7 OR 8, 11, 8, 12, —, —, —, — - VIRTUAL CONDUCTORS (Z): 96, 76, 76, 72, 42, 58, 56, 66, 50, 90, 78, 80 - WINDING PITCH IN VIRTUAL CONDUCTORS (Z): 1&8 FOR'D 1&7 BACK'D, 1&8 FOR'D 1&8 BACK'D, 1&8 FOR'D 1&7 BACK'D, 1&13 FOR'D 1&11 BACK'D, 1&9, 1&8 & 1&9, 1&4 FOR'D 1&4 BACK'D, 1&9, 1&4 & 11, 1&4 & 12, 2&4 & 21 - STEP ON WINDING PITCH IN SLOTS: 12 (1 & 13), 8 (1 & 9), 7 (1 & 8), 5 & 6 (1 & 6 & 7), —, 7 (1 & 8), 3 (1 & 4), 4 (1 & 5), 6 (1 & 7), 7, 3 & 4 - ARMATURE RESISTANCE (COLD) (OHMS): .46, .685, .58, .51 AT 22°C, .40 AT 20°C, .37, .418, .417, .18, .327, .20, .333 - CONDUCTOR DIMENSIONS: .18 SWG D.C.C, —, .081 x .061 D.C.C, .081 x .045 D.S.C, .081 x .081 D.C.C, .040 19 SWG, .041 18 SWG, —, —, —, — COMMUTATOR AND BRUSHES - COMMUTATOR DIAMETER (IN): 1.90, 2.0, 2.05, 1.77, 1.25, 2.10, 2.10, 1.97, 1.97, 1.98, 1.06, 1.2 - COMMUTATOR LENGTH (IN): .78, 1.00, 1.00, .94, .60, .925, .80, 1.00, .95, .975, 1.06, 1.02 - BRUSH CONTACT AREA: 1"x.50"x.25", 1"x.75"x.28", 1"x.75"x.28", 2x.274x.513, 1"x.35"x.225", 1"x.75"x.205", 2"x.62x.385, .75"x.375", 2"x.62x.281", 1"x.395x.305", 1"x.55x.300", 1"x.75"x.208" - GRADE AND HARDNESS OF BRUSHES: C.A.V. O.O. MORGANITE A.S. GRAPHITIC METALLIC, C.M. MORGANITE ELECTRO GRAPHITIC HARD, E.G. MORGANITE ELECTRO GRAPHITIC VERY HARD, C.M. 3. L.F. VERY SOFT, C.M.B. HARD MORGANITE, RESEMBLES C.M.3. MORGANITE, LE CARBONE Z(O) HARD, C.4 HARD GRAPHITE, HMG6 HARD GRAPHITE, RESEMBLES LINK 5 VERY SOFT, MORGANITE E43 HARD GRAPHITE, L.F.C.R. GRAPHITE VERY SOFT, RESEMBLES A 6 MORGANITE NOTE. ALL MACHINES ARE 12 VOLT EXCEPT THE LIBERTY WHICH IS 8 VOLT. (TABLE REVISED TO. 4-7-23) | ||