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 curve graph comparing a Rolls-Royce motor (#1) and a Westinghouse motor (#2).
| Identifier | ExFiles\Box 23\2\ Scan081 | |
| Date | 29th March 1921 | |
| #1 ROLLS-ROYCE MOTOR CURVE 10217/ #2 WESTINGHOUSE 10216/ CURVE #32168 R.P.M. TORQUE LBS, FT & VOLTS. HORSE POWER E.J. Apostle 3-29-21 CURVE # 10216/B #1 EFFICIENCY #2 EFFICIENCY #1 RUNNING TORQUE #2 RUNNING TORQUE #1 HORSE POWER #2 HORSE POWER #1 SPEED #2 SPEED RUNNING VOLTS #1 LOCKED VOLTS #2 LOCKED VOLTS | ||