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).
Test results for an experimental motor fitted with C.M.2 brushes and F.7180 springs which was stopped due to excessive heat.
| Identifier | ExFiles\Box 35\1\ scan 036 | |
| Date | 5th November 1919 | |
| Mr. Clark. --------- 31.1 5.11.19. X.3348 TESTS OF EXPERIMENTAL MOTOR FITTED WITH C.M.2 BRUSHES AND F.7180 springs. X-2606 The motor was loaded up to about 140 amps. the torque being 500 lb/inches. It ran at this load for 20 minutes without any sign of brush failure. It was necessary to take it off at the end of 20 mins. owingto the excessive heat. (Sgd) L.F. | ||