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 50\1\ Scan245 | |
| Date | 4th July 1923 | |
| X.294 SHUNT DYNAMO TABLES. HEADERS: X.294 (No 32 C.A.V. AS SHUNT), X.295 (SMITH No R.R A.{Mr Adams}), X.295 (SMITH S.D. AS SHUNT), X.796 (BOSCH), X.3306 (LIBERTY), X.2968 (R.R. AT 18"), X.1005 (ROTAX 15 SHUNT), X.4030 (WESTINGHOUSE AS SHUNT), X.3768 (SCINTILLA), X.4240 (R.BOSCH), X.4292 (TOTALLY ENCLOSED), X.4132 (M.L. M1814) DYNAMO WEIGHTS IN LBS COMPLETE MACHINE WITH PULLEY BUT WITHOUT SUSPENSION: 36, 38.0, 33.8, 37.0, 11.7, 20.8, 27.0, 21.1, 30.7, 29.1, 27.4, 29.2 ARMATURE COMPLETE WITHOUT PULLEY: 9.5, 9.5, 9.9, 9.4, 3.0, 7.3, 11.2, 7.2, 10.8, 8.8, 10.125, 8.9 BARE WEIGHT OF CARCASE AND FIELD 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, -, -, -, -, -, -, - AIR GAP Mm.: .625, .81, .51, .23, .33, .38, .508, .508, .34, .90, .43, 4/32 Inches: .025, .032, .020, .009, .013, .015", .020, .020, .0135", .029, .017, .0125 FIELD CIRCUIT NUMBER OF WOUND POLES: 2, 2, 2, 1, 4, 4, 4, 4, 4, 4, 4, 4 DIAMETER OF WIRE. NEAREST S.W.G. INSULATION: .041 18 SWG D.C.C., -, .0455 18 SWG S.C.C., .0455 18 SWG D.S.C., .034 21 SWG S.S.C., .040 19 SWG D.C.C., .038 20 SWG D.C.C. & E.{Mr Elliott - Chief Engineer}, .031 21 SWG, -, -, -, - NUMBER OF TURNS PER COIL: 495, -, 285, 601, 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 IN SERIES, ALL IN SERIES, ALL IN SERIES RESISTANCE OF FIELD CIRCUIT (COLD) 15°C (Ω): 5.2, 4.0, 4.3, 1.0 AT 22°C, 4.1 AT 20°C, 2.6, 1.81, 0.5, 10.7, 4.6, 6.0, 8.5 ARMATURE CIRCUIT TYPE OF WINDING: PROG LAP, RETROG LAP, PROG LAP, RETROG LAP, RETROG WAVE, RETROG WAVE, RET WAVE, RETRO WAVE, -, -, RETRO WAVE, RET WAVE NUMBER OF SLOTS (S): 24, 19, 19, 12, 21, 22, 14, 17, 25, 15, 20, 16 NUMBER OF CONDUCTORS (N): 672, 760, 684, 480, 462, 484, 602, -, -, -, -, - CONDUCTORS PER SLOT (N/S): 28, 40, 36, 40, 22, 16, 43, -, -, -, -, - COILS PER SLOT (S/2): 2, 2, 2, 3, 1, 2, 2, 1, 3, 2, - NUMBER OF COILS OR COM BARS (C): 48, 38, 38, 36, 21, 22, 28, 33, 25, 45, 39, 32 TURNS PER COIL (N/2C): 7, 10, 9, 5,7,4,8, 11, 8, 12, -, -, -, -, - VIRTUAL CONDUCTORS (AC): 96, 76, 76, 72, 42, 59, 86, 66, 50, 90, 78, 80 WINDING PITCH IN VIRTUAL CONDUCTORS (z): 4 FORWARD 9, 38 FOR'D 33 BACK'D 35, 28 FOR'D 27 BACK'D 27, 10's & 8's, 11 & 9, 15 & 13, 15 & 11, -, 13 & 11, -, -, 23 & 1 STEP OF WINDING PITCH IN SLOTS (COMM): 8 (1 TO 9), 8 (1 TO 8), 7 (1 TO 8), 5 (1 TO 6), 5 (1 TO 6), 7 (1 TO 8), 5 (1 TO 6), 4 (1 TO 5), 5 (1 TO 6), -, 7 (1 TO 8), 8 (1 TO 9) ARMATURE RESISTANCE (COLD) (Ω): .16, .885, .58, .5 AT 20°C, .40 AT 20°C, .37, .418, .417, .18, .327, .26, .235 CONDUCTOR DIMENSIONS: 18 SWG D.C.C, -, .061, .045 18 SWG, .033 21 SWG, .040 19 SWG, .040 19 SWG, -, -, -, -, - COMMUTATOR AND BRUSHES COMMUTATOR DIAMETER (INS): 1.90, 2.0, 2.05, 1.77, 1.25, 2.10, 2.10, 1.97, 1.97, 1.23, 1.95, 1.8 COMMUTATOR LENGTH (INS): .78, 1.00, .94, -, .60, .925, .80, 1.00, .95, -, 1.05, 1.02 BRUSH CONTACT AREA: 1x.60"=.6 x.25"=.25, 1x.75"=.75 x.375"=.2812, 1x.75"=.75 x.375"=.2812, 2x.274"=.548 x.313"=.170, 1x.35"=.35 x.225"=.078, 2x.62"=1.24 x.2875"=.3565, 2x.62"=1.24 x.31"=.3855, 2x.62"=1.24 x.24"=.2880, 2x.595"=1.19 x.5744"=.5744, -, 1x.45"=.45 x.425"=.1900, 1x.45"=.45 x.30"=.1350 GRADE AND HARDNESS OF BRUSHES: C.A.V. D.O. RESEMBLES A.S. MORGANITE METALLIC, C.M. C.O. RESEMBLES MORGANITE METALLIC, E.G. SOFT RESEMBLES MORGANITE ELECTRO GRAPHITIC, C.2. VERY SOFT MORGANITE GRAPHITE, C.M.B. HARD MORGAN GRAPHITIC, Z(O) HARD MORGAN GRAPHITIC, C.A. HARD CARBON, C.4. HARD GRAPHITE RESEMBLES MORGANITE, HM{Capt. W. Hallam - Head Repairs}6 HARD GRAPHITE, EG3 HARD GRAPHITE, LINK 6 VERY SOFT MORGANITE, LFC8 VERY SOFT MORGANITE, A5 GRAPHITIC CLOSELY RESEMBLES MORGANITE NOTE. ALL MACHINES ARE 12 VOLT EXCEPT THE LIBERTY WHICH IS 8 VOLT (TABLE REVISED TO 4-7-23) | ||