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).
Temperature and performance tests of a component after a modification.
| Identifier | ExFiles\Box 51\1\ Scan137 | |
| Date | 6th November 1918 | |
| RR. 238 (300 Bks.) (SF 152. 6-11-18.) MP 197880 ROLLS-ROYCE LIMITED. INSTRUCTIONS. To Order No Customer's No. Z The final temperature attained was 68°C, when the cutting-in speed (13.6 volts) was 730 rpm, as compared with 680 rpm previous to the modification. On connecting to a battery, the rising part of the current curve was found to be about 100 rpm later than with the coarser field. working at 62°C, but above 1600 rpm the output was much greater*, the curve being more flat-topped. The field current was reduced at cutting-in from 3.1 amps to 2.55 amps, but at higher speeds exceeded that of the old winding. *8.0 amps at 3000 rpm. Signed F. {Mr Friese} J. {Mr Johnson W.M.} Allen. This Sheet must be filed on completion of the work. | ||