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).
Table comparing starter motor power and efficiency data for various motor types.
| Identifier | WestWitteringFiles\T\2July1929-December1929\ Scan028 | |
| Date | 1st July 1929 guessed | |
| STARTER MOTOR POWER AND EFFICIENCY DATA. COLUMN HEADERS: - Curve Ref. No. - Motor - Carcase dia(") - Armature Dia(") - Armature Length(") - No. of conduc Lore. - No. of field turns per pole. - Amperes for 90 lb-inches conductor torque. - Super-header: Brake test quantities at 90 lb-inches conductor Torque. - Elect.¹ H.P. - Speed R.P.M - Brake Torque - Brake H.P. - Super-header: Efficiency - Elect. - Mech. - Overall DATA: Row 1: - Curve Ref. No.: 1 - Motor: R.R. Std. - Carcase dia("): 6.000 - Armature Dia("): 3.600 - Armature Length("): 2.250 - No. of conduc Lore.: 90 - No. of field turns per pole.: 8 1/2 - Amperes...: 144 - Elect.¹ H.P.: 1.76 - Speed R.P.M: 745 - Brake Torque: 80.5 - Brake H.P.: .952 - Efficiency Elect.: .603 - Efficiency Mech.: .895 - Efficiency Overall: .540 Row 2: - Curve Ref. No.: 2 - Motor: Sequence G.2 - Carcase dia("): 5.000 - Armature Dia("): 3.100 - Armature Length("): 2.750 - No. of conduc Lore.: 82 - No. of field turns per pole.: 6 1/2 - Amperes...: 169.5 - Elect.¹ H.P.: 1.96 - Speed R.P.M: 610 - Brake Torque: 76 - Brake H.P.: .736 - Efficiency Elect.: .445 - Efficiency Mech.: .845 - Efficiency Overall: .376 Row 3: - Curve Ref. No.: 3 - Motor: Sequence K.{Mr Kilner} - Carcase dia("): 5.000 - Armature Dia("): 3.100/2.900 - Armature Length("): 2.750 - No. of conduc Lore.: 90 - No. of field turns per pole.: 6 1/2 - Amperes...: 188 - Elect.¹ H.P.: 2.08 - Speed R.P.M: 450 - Brake Torque: 78.5 - Brake H.P.: .560 - Efficiency Elect.: .308 - Efficiency Mech.: .872 - Efficiency Overall: .269 Row 4: - Curve Ref. No.: 4 - Motor: R.Bosch S.45 - Carcase dia("): 5.900 - Armature Dia("): 3.700 - Armature Length("): 2.870 - No. of conduc Lore.: 82 - No. of field turns per pole.: - - Amperes...: 169 - Elect.¹ H.P.: 1.95 - Speed R.P.M: 960 - Brake Torque: 84 - Brake H.P.: 1.278 - Efficiency Elect.: .703 - Efficiency Mech.: .933 - Efficiency Overall: .656 Row 5: - Curve Ref. No.: 5 - Motor: R.Bosch Post-War. - Carcase dia("): 4.928 - Armature Dia("): 2.750 - Armature Length("): 2.800 - No. of conduc Lore.: 62 - No. of field turns per pole.: - - Amperes...: 279 - Elect.¹ H.P.: 2.40 - Speed R.P.M: 445 - Brake Torque: 82 - Brake H.P.: .579 - Efficiency Elect.: .265 - Efficiency Mech.: .911 - Efficiency Overall: .241 Row 6 (un-numbered): - Curve Ref. No.: [blank] - Motor: R.R. Sequence Design - Carcase dia("): 5.000 - Armature Dia("): 3.100/3.000 - Armature Length("): 3.500 - No. of conduc Lore.: 74 - No. of field turns per pole.: 4 1/2 - Amperes...: 180 - Elect.¹ H.P.: 2.02 - Speed R.P.M: 640 - Brake Torque: 81 - Brake H.P.: .823 - Efficiency Elect.: .452 - Efficiency Mech.: .900 - Efficiency Overall: .407 Row 7 (numbered 6): - Curve Ref. No.: 6 - Motor: R.R. Sequence - Carcase dia("): 5.000 - Armature Dia("): 3.100/3.000 - Armature Length("): 3.500 - No. of conduc Lore.: 74 - No. of field turns per pole.: 4 1/2 - Amperes...: 165 - Elect.¹ H.P.: 1.92 - Speed R.P.M: 770 - Brake Torque: 70 - Brake H.P.: .855 - Efficiency Elect.: .571 - Efficiency Mech.: .778 - Efficiency Overall: .445 | ||