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 report on experimental E.A.C. dynamo outputs, designated /03, 05, and 07.
| Identifier | WestWitteringFiles\L\2April1924-June1924\ Scan86 | |
| Date | 1st May 1924 | |
| [Stamp: ORIGINAL S SHEET E.A.C. SIGNAL] To R & E.{Mr Elliott - Chief Engineer} from EFC. c. CJ. & FN. c. EY. EP.{G. Eric Platford - Chief Quality Engineer} DA.{Bernard Day - Chassis Design} EFC1/T21.5.24. X.9660 - E.A.C. DYNAMO OUTPUT PERFORMANCE. Further to our EFC1/T13.3.24, four experimental EAC. dynamos, designated/03, 05, and 07 have now been investigated as regards output performance, and the figures recorded below as the representative performance of these EAC. machines are averages of various numbers of these four. One of the sets of curves, issued under cover of our EFC1/T13.3.24, is now re-issued, having had added to it two further curves, one that of the average performance at specification temperature (75°C) and the other, the engine hot performance at 85°C. Further the output minus the ignition current curve has been altered to suit the new average 85° output curve. Arranged as a shunt machine, the average performance is practically identical with that previously reported, namely:- [Vertical handwritten text in left margin, alongside a brace covering (a), (b), and (c)]: SHUNT machines (a) In the cold condition a balancing terminal P.D. of 12.4 volts is put up at 412 r.p.m. (Result of one machine). (b) In the hot (75°C) condition a balancing P.D. of 13.6 volts is put up at 472 r.p.m. (Average of three machines). (c) The ampere output performance rises sharply as the speed is increased above the balancing speeds as mentioned, reaching 10 amperes in the cold condition at 582 r.p.m. (result of one machine) and 11.0 amperes in the hot condition at 700 r.p.m. (average of three machines). Contd. | ||