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).
Motor performance, including main winding turns, current, and frictional effects.
| Identifier | ExFiles\Box 64\1\ scan0248 | |
| Date | 9th November 1926 guessed | |
| -2- and 25 amperes; not using it, i.e. to 510 and 750 ampere turns respectively. In the case of the main winding the number of turns is 6½. It is difficult to say precisely to what the amount of current would be reduced when the engine is driving the motor before disengagement, but I should think it might easily go below the 50 amperes, which is the smallest current for which we have drawn a curve. The frictional effect at axial forces below 4 lbs. weight would be relatively so large as rather to upset the readings. The curves that have been obtained, however, are for the case of friction eliminated by a method which was found to be sufficiently reliable. EFC. For curve see. X 7625A. | ||