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).
Performance curves of plain shunt-wound dynamos showing volts and amperes vs. speed under hot and cold conditions.
| Identifier | WestWitteringFiles\K\June1923\ Scan59 | |
| Date | 23th November 1920 | |
| [CHART III - TOP LEFT] Roman Numeral: III Title: OPEN CIRCUIT VOLT-SPEED CURVES OF PLAIN SHUNT WOUND DYNAMOS FOR COLD CONDITIONS Main Label: COLD VOLTS Y-Axis: E.M.F (VOLTS) X-Axis: DYNAMO SPEED (RPM) Curve Labels: Rotax (11°c), SMITH DD (20°c), SMITH A (20°c), R.Bosch A12SS{S. Smith} (15°c), Simms L.A.4 Easy (24°c), J.L. Brook (14°c), Bijur (19°c), WESTINGHOUSE (19°c). Annotation: 12.4 volts [CHART VI - TOP RIGHT] Roman Numeral: VI Title: PLAIN SHUNT-WOUND DYNAMOS OPERATING UPON 12 VOLT BATTERY CIRCUIT OF DEFINED VOLT-AMPERE CHARACTERISTIC. SEE SCALES. FOR HOT CONDITIONS. Main Label: HOT AMPERES Y-Axis Left: AMPERE OUTPUT Y-Axis Right: OPERATING VOLTAGE X-Axis: DYNAMO SPEED (R.P.M) Annotation: Specified performance of inherently controlled dynamo for R car Curve Labels: Rotax AT III (40°c), U.S.A Bosch (84°c), Bijur (70°c), SMITH A (82°c), R.Bosch A12SS{S. Smith} (72°c), Simms L.A.4Easy (New), SMITH DD (84°c), U.S.A Brook, WESTINGHOUSE (64°c). [CHART V - BOTTOM LEFT] Roman Numeral: V Title: AMPERE OUTPUT CURVES OF PLAIN SHUNT-WOUND DYNAMOS FOR COLD CONDITIONS. OPERATING UPON 12 VOLT BATTERY CIRCUIT OF DEFINED VOLT-AMPERE CHARACTERISTICS. SEE SCALE. Main Label: COLD AMPERES Y-Axis Left: AMPERE OUTPUT Y-Axis Right: OPERATING VOLTAGE X-Axis: DYNAMO SPEED (R.P.M) Curve Labels: Rotax ATIR (11°c), USA Bosch (18°c), SMITH A (24°c), Bosch (20°c), R.Bosch A12SS{S. Smith} (17°c), Simms L.A.4Easy (24°c), SMITH DD (20°c), Bijur (20°c), WESTINGHOUSE (19°c). [CHART IV - BOTTOM RIGHT] Roman Numeral: IV Title: OPEN CIRCUIT VOLT-SPEED CURVES OF PLAIN-SHUNT-WOUND DYNAMOS FOR HOT CONDITIONS Main Label: HOT VOLTS Y-Axis: E.M.F (VOLTS) X-Axis: DYNAMO SPEED (R.P.M) Annotation: 13.6 volts Curve Labels: Bosch (71°c), Rotax (69°c), SMITH DD (80°c), R.Bosch A12SS{S. Smith} (102°c), SMITH A (83°c), Simms L.A.4 Easy (New), U.S.A. Bosch (64°c), Bijur (70°c), WESTINGHOUSE (62°c). [GENERAL NOTES - REPEATED ON CHARTS] Note The Smith dynamos were converted to simple shunt machines by removing the control brushes and setting the main brushes in the exact neutral position. Note The Rotax and USA Bosch dynamos were converted to simple shunt machines by removing the control brush and connecting the single field winding across the main brushes. [HANDWRITTEN SIGNATURES/DATES - REPEATED ON CHARTS] H.A. / 22-XI-20 S.7.C / 23/11/20 | ||