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).
Graph of test curves for a type 20-25 starter motor, comparing a standard machine with one featuring a stamped slotted armature.
| Identifier | ExFiles\Box 62\1\ scan0158 | |
| Date | 23th August 1933 | |
| STARTER MOTOR TEST CURVES TYPE-20-25 FULL LINES = STANDARD WITH STAMPED SLOTTED ARMATURE No- B.6.W DOTTED LINES = STANDARD MACHINE No- H.8.GX EFFICIENCY VOLTAGE AMPERES B.H.P. MOTOR ARMATURE SPEED R.P.M. TORQUE (POUND. INCHES) AMPERES B.H.P. VOLTS EFFICIENCY R.P.M. L.B. 23-8-33 | ||